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Models 172,173 Instruction Manual Contains Operating and Servicing/Calibration Information for Models 172,173,1722, and 1728 Publication Date: October, 1977 Keithley Instruments, Inc. Instrument Division Cleveland, Ohio, U.S.A. Document Number: 28262 INSTRUCTION MANUAL Dlgltat Multlmeter Models 172,173 [Contalnr Operating and SafuWno/~bmtlon In!omuNon For Moddr 172,173,1722, and 1728.1 ‘1 KEITHLEY INSTRUMENTS m INSTRUCTION Digital Multimeter Models @COPYRIGHT THIRD 1976, MANUAL 172, KEITHLEY 173 INSTRUMENTS, INC. OCT. 1977, CLEVELAND, OHIO U.S.A. PRINTING, DOCUMENT NO. 28262, REVISION CODE CC INSTRUCTION MANUAL Dlgltal hlultlmeler Models 172,173 CONTENTS I Section I I CONTENTS ......................... ILLUSTRATIONS. : : : : : : SPECIFICATIONS ............ I. GENERAL INFORMATION. : : : : : ....... l-l. INTRODUCTION . . . . . . . . . . . . . l-2. FEATURES . . . . . . . . . QARRANTY INFORMATION . . . : : : : : : l-3. 1-4. CHANGE NOTICE. . . . . . . . . OPTIONAL MODEL 1728 RECHARGEABL; ;A;T;R; l-5. OPTIONAL MODEL 1722 DIGITAL INTERFACE. l-6. I , I 4. I:5. I i I ii Page : : : : : : : : : : : : : : : : : : : : : : : : : . . . . . . . . . . . . . : : : : : : : . . PACK: : : : . . . . . . . OPERATING INSTRUCTIONS ................... 3-l. GENERAL ........................ 3-2. HOW TO SELECT POWER. ................. ;I;. HOW TO SELECT FUNCTION................................ HOW TO SELECT RANGE. HOW TO MEASURE VOLTAGE ........ HOW TO MEASURE CURRENT (MODEL 172 ONLY): : HOW TO MEASURE CURRENT (MODEL 173 ONLY). HOW TO MEASURE RESISTANCE. .. .. ... : FURTHER MEASUREMENT CONSIDERATIONS ;I?;. HOW TO USE MODEL 172/173 OFF-GROUND: : : : 3-11. HOW TO USE OPTIONAL PROBES AND SHUNTS. ........ 3-12. HOW TO USE THE MODEL 1722 DIGITAL INTERFACE. ACCESSORIES .................... GENERAL..................:::: 4-l. POWER OPTIONS. .................... ISOLATED DIGITAL OUTPUT. ........ : 4-4. RACK MOUNTING. ............. 4-5. PROBE AND SHUNTS ................... 4-6. CABLES AND CONNECTORS. ................ 4-7. MISCELLANEOUS. .................... THEORY OF OPERATION. .................... 5-l. GENERAL ........................ INPUT SIGNAL CONDITIONING. .............. POWER SUPPLY, SCHEMATIC NO. 28067D .......... DISPLAY BOARD PC-403 SCHEMATIC NO. 274780. CURRENT BOARD, SCHEMATIC NO. 27478D. ......... MODEL 1728 RECHARGEABLE BATTERY PACK ......... ANALOG-TO-DIGITAL CONVERTER. ............. MODEL 1722 DIGITAL INTERFACE .... DETAILED II-WIRE OHMS OPERATION ... : : : 5-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : : : : : : : : : : : : : : : : : : . . . . . . . . ..... :: : : : : : : ...... : : : : : : . * . . . . . . . . . . . . . . .. ii iii " : : : : I-I . . I-l . . l-1 . l-l . l-l . . 1-I . . . 1-l . . . 2-l . . . 2-l . . . 2-l 2-l : : : : . . . * . . . . . . . . . . . . . . . . . . . * . . . . . . . . . . . . . . . 3-l . . , 3-l . . 3-l . 3-2 . . 3-3 . 3-4 . . . 3-5 . . . 3-6 . . . 3-7 . . . 3-8 . . . 3-11 . . . 3-12 . 3-13 . . . 4-l * . . 4- 1 . . . 4-l . . . 4-l * . . 4-l . . . 4-4 . . . 4-5 . . . 4-5 . . . 5-l . . . 5-1 . . . 5-2 . . . 5-9 . . . 5-10 . . . 5-12 . . . S-13 . . . 5-13 . . . 5-22 . . . 5-26 AA I INSTRUCTION MANUAL Digllel Mulllmeter Model8 172. 173 CONTENTS (continued) I /section 6. Page >_I MAINTENANCE. ................ GENERAL. ............... 6-2. REQUIRED TEST EQUIPMENT. ........................ 6-3. PERFORMANCE VERIFICATION 6-4. ADJUSTMENT/CALIBRATION PR&D;R; : TROUBLESHOOTING AND REPAIR , . 6-5. REPLACEABLE PARTS. . . . . . . . . . : : 7-1. GENERAL. . . ORDERING INFORMATiON : : : : : : : 7-2. J-3. SCHEMATICS . . . . . . . . . . . . 6-1. 7. : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 6-1 6-1 6-I 6-3 6-15 : : : : : : : . : : . . : : . . : : : : : : : : : : : : : J-1 1 : : : : : : : : : : : : : : . . . . . . . . . . . . . ;:; J-1 j ) ILLUSTRATIONS Fi g ure No. I : 4 2 z 9 IO II 12 13 I4 I5 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 ;: nb ;:a. 34b. Title / 6-19, Page iv Dimensional Data. .......................... vi Tilt Bail Positions ......................... t-2 Front Panel ............................. l-3 Bottom View Showing Line Cord .................... 2-2 Rear Panel Showing Current Fuse and Check Points. .......... 2-4 Model 1728 Rechargeable Battery Pack. ................ 2-5 Installation of Battery Pack. .................... 3-3 Front Panel Pushbutton Selection. .................. 3-5 Typical Model 172 Current Display .................. 3-6 Typical Model I73 Current Display .................. 3-J Typical 2 WIRE Resistance Measurement ................ 3-9 Typical 4 WIRE Resistance Measurement ................ 3-10 Semiconductor Diode and Transistor Testing. ............. 3-11 Illustration of Floating Operation. ................. 3-14 Model 1722 Digital Output Interface ................. 3-15 Installation of Model 1722. ..................... 3-17 Connector Pin Identification. .................... 3-17 Card-Edge Connectors. ........................ 3-18 1722. ........... Location of Jumpers and Pull-Ups on Model Model 1010 Single Rack Mounting Kit. .............. .4-Z : : .4-4 Model 1017 Dual Rack Mounting Kit. ............... : . .5-l Overall Block Diagram of Model lJ2/173 ............. .5-4 DC Volts Input Circuit ....................... Simplified AC Attenuator Circuit .5-6 ....... 1 : ‘.‘.‘: : : : : : : . .5-6 AC Converter Circuit ............ .5-II Digital Display Multiplex Scheme .................. .5-14 Basic Functional Blocks of A/D Converter .............. .5-15 Basic Charge-Balance Converter ................... .5-16 Operating Waveforms of A/D Converter ................ Simplified Schematic of A/D Converter. .5-18 ............... Detailed Schematic of A/D Converter. ................ .5-20 A/D Converter System Timing. .................... .5-21 Model 1722 Block Diagram ...................... .5-24 Simplified Ohms Diagram (Shown in Z-WIRE Configuration). ...... .5-25 Four-Wire Ohms Measuring Technique ................. .5-25 I INSTRUCTION MANUAL Digltal Multimeter Models 172, 173 12.75 (324) I DIMENSIONS FIGURE 1. IN INCHES Dimensional (MM) Data. na I INSTRUCTION MANUAL Digllal Multimeter Model, 172, 173 SPECIFICATIONS AA INSTRUCTION MANUAL Digital Mullimeler Models 172.173 LEVEL POSITION - TILTBAIL AT FRONT r HANGING POSITIOI; SHELF POSITION 45' LEVEL POSITION POSITION FIGURE vi 2. Tilt Bail - TILTBAIL AT REAR Positions. AA INSTRUCTION MANUAL Digital Multimeter GENERAL Models 172. 173 I ~ INFORMATION SECTION GENERAL INFORMATION 172 and l-l. INTRODUCTION. The Models purpose measuring instruments, resistance. l-2. I. capable 173 Digital of measuring Multimeters are wide-range, ac/dc voltage, ac/dc current, generaland FEATURES a. Automatic Ranging and b. Manual Range C. HI and LO Otxns Capability d. Line e. Optional Battery f. Floating Capability 9. Optional Isolated Selection Polarity and Range Hold Operation Operation, to Model ?lbOOV Digital 1728. peak Interface, Model 1722 The warranty is stated on the inside front cover WARRANTY INFORMATION. l-3. If there is a need for service, contact your Keithley representative manual. ized repair facility as given in OUT catalog. of or Improvements or changes to the instrument l-4. CHANGE NOTICE. manual will be explained on a change notice sheet attached to the manual. into the cover of not incorporated the inside back the author- OPTIONAL MODEL 1728 RECHARGEABLE BATTERY PACK. The Model 1728 is an accessory l-5. batterY pack which enables either line or battery operation. The Model 1728 has builtin recharging circuitry. The Model 1728 is field-installed on the Model 172/173 chasis. l-6. ~~~~digital OPTIONAL MODEL 1722 DIGITAL output option. It provides INTERFACE. isolated The model open-collector 1722 is a field-installable BCD outputs and control lines. IMPORTANT The A symbol can be found in various read the associated CAUTION statements instrument. Damage to the instrument Carefully places in this Instruction Manual. with regard to proper use and handling of may occur if these precautions are ignored. the This symbol The t symbol can be found in various places in this Instruction Manual. Carefully indicates those areas on the instrument which are potential shock hazards. read the associated WARNING statements with regard to proper use and handling of the instrument. Serious personal injury may result if these precautions are ignored. cc l-l GENERAL INSTRUCTION INFORMATION MANUAL Digital Multimeter Models 172.173 FUNCTION AND UNITS DISPLAY (my) INPUT HI AND LO, UPPER PAlR (OHMS SOURCE. LOWER PAIR) \\ VOLTAGE AHPERES DC FUNCTION AUTORANG, NG (OUT) MANUAL RANGING (IN) FUNCTION FUNCTION LINE POWER (LINE AND EAT MUST BE OUT FOR BATTERY FIGURE 3. I l-2 Model 173 Front (OUT) (IN) CHARGE) Panel CC INSTRUCTION MANUAL Dlgllal Multlmeler Modelr GENERAL INFORMATION 172,173 I -3 I GENERAL INFORMATION INSTRUCTION MANUAL Digllal Mullimeter Models 172.173 I 1 172. 173 CONDENSED OPERATING INSTRUCTIONS II FUNCTION SELECTION ME&RE , II , 3, (SE%%f, 101.9999A LP'.. .I.... '"".q / 1 ( HlllOD OVERRANGE:FIRST DIGIT 3. REMAINING IIICITS LINE IRICKLECHARGES OUl.CHARGES DISCHARGED 1728 IN I6 HOURS, IN.OPERATESlNSTRUMENTfOR6HOUASFROM 1728BAT PACK, RAT. IfINSTAtLEO.FRON7PANELLOBAT LlGHTCIIMFSflNIf RdTTlAY 1 OPERATlONWOULOCAUSEfAULTYREAOlNGS SELFTEST(REARPANEL)) CONNECT~NG~NPUTHITODCTERMINALW~~~CAIJSE~NSTRUMENT DC ~~~~~~~f'PROX.5VINOCVOLTSANOImAINOCAMPS. CONNECTlNGlNPUTHITOACTERMINALWlttCAUSElNSTRUMENT IIAC 1 T""'*"""PROX.6VINACVOLTSANDl.2mAINACAMPS. ) CONNECTlNGlNPUTHITOQlERMINAtWIttCAUSElNSTRUMENT II n l‘ 1 TIJREADAPPROX.10kIN2TERMlNALOHMS. I TO OPEN INSTRUMENT:CAUTION-DISCONNECTLINE CORD.LOOSEN (4) SCREWS (THIS SIOE). HOLD INSTRUMENT TOGETHER AND TURN OVER.TltT TOP COVER BACK AND UP, DISCONNECT (2) CONNECTORS (CURRENT FUSE LINE AND SELF CHECK). I l-4 AB INSTRUCTION INITIAL MANUAL PREPARATION Digital Mulllmeler Models 172. 173 I SECTION 2-l. GENERAL. preparation for 2-2. trically which verify This use. section INITIAL 2. provides PREPARATION information needed for incoming inspection and INSPECTION. The Model 172/173 was carefully inspected both mechanically and elecUpon receiving the instrument, check for any obvious damages before shipment. Report any damages to the shipping agent. To may have occurred during transit. follow the procedures given in Section 6. the electrical specifications, 2-3. PREPARATION FOR USE. The can be powered from line voltage optional Model 1728 Rechargeable Model 172/173 is shipped ready-to-use. or from rechargeable nickel-cadmium Battery Pack is installed). The Model 172/173 has an attached receptacles (NEMA 5-l5P). The the cord around the base of the Line Power. a. third-wire grounded stored by wrapping three-wire permanently instrument The batteries instrument (when the line cord which mates with installed line cord is as shown in Figure 4. CAUT I ON This 234V instrument position for has an internal line power operation above 125 volts selector switch rms, 50-60 HZ. that must be set to The Model 172/173 has a 1. How to Set the Internal Line Voltage Switch (~601). To set the switch for two position slide switch located on the main circuit board. The top cover must be operation above I.25 volts the switch setting must be changed. removed to gain access to the circuit board as described in MAINTENANCE section. WARNING t Disconnect voltage is HAZARD. the line cord before removing present at various points on Other line transformer voltage ranges T601 as shown Summary of are available on schematic Standard to 125 V rms 210 to 250 v rms NOTE when wiring 28067~1. TABLE and 2-l. Optional the and instrument. represents modifications Line are Line a SHOCK made to Voltages Optional Standard I05 the top cover of the circuit board 90 195 - 105 v rills 210 v rms > Transformer wiring must be modified 2-l .INITIAL PREPARATION INSTRUCTION MANUAL Digital Mullimeler Models SELF FIGURE 2-2 5. Rear Panel Showing 172.173 FUSE Current Fuse and Check Points AA STRUCTION MANUAL .gllel MultImeter INITIAL PREPARATION ~~Modelr 172, 173 2. Line line-operated l/4 ampere A Replace The Model 172/173 use a single line Fuse Requirement. The fuse is a 3 AB or 3 AG, slow-blow power supply. for 117 volts operation or l/8 ampere for 234 volts. IMPORTANT fuse with correct otherwise rating damage to the fuse to type. instrument protect the with Replace could result. the Line Fuse. 3. How to Replace The fuse is installed on the main circuit board as shown in Figure 36 (page 6-10). The top cover must be removed to gain access to the circuit board as described in Section 6. Use Keithley FU-17 for 117 V; FU-20 for 234V. WARNING t Disconnect voltage is HAZARD. the line present cord before removing at various points on the top cover of the circuit board the and instrument. represent Line a SHOCK CAUTION A The fuse installed range protection. b. Battery Rechargeable factory-installed on the rear panel of the Model This fuse is -not a line voltage 172/173 is protection To operate the Model 172/173 from batteries, Power. The Model 1728 can Battery Pack must be installed. (at the time the Model 172/173 is purchased). used only fuse. for current the Model 1728 be either field or NOTE The Model 1728 Rechargeable Battery Pack can be installed However, if the Model 1722 Model 172/173 at any time. the Model 1728 cannot be used simultaneously. installed, 1. How to Install the Model with the Model 1728 are already cludes 7 rechargeable “C” cells cells per pack). See Figure 6. a) 3AB or Check the fuses 3 AG, Slo-Blo 1728 Rechargeable installed (l.ZV, on the Battery types, Keithley b) Check for proper installation battery cells are to be installed, individual cells as shown in Figure in the 2 AMP Hr) Battery battery and two Three fuses Pack. Part No. FU-IO. of batteries be certain 6. to in the observe by Digital the user Output within the is already The batteries furnished Pack. pack. The battery pack in19.2 volt packs (sixteen l.ZVare used. All are If Battery Pack. the proper polarity I ampere, replacement of the turn the instrument over so that the bottom cover c) To install the Battery Pack, The Loosen four slotted screws on the bottom cover as shown in Figure 4. faces up. Turn over the instruthat is they cannot be removed completely. screws are captive, care to hold the top and bottom covers toment with the top cover facing up, taking Carefully remove the top cover to gain access to the printed circuit board. gether. There are 2 connections between the top cover and the main circuit board which must Check to see that the four be temporarily removed in order to free the top cover. insulating spacers are in position on the circuit board as shown in Figure 7. Plug into the mating receptacles (~602, P606) takthe two S-wire connectors (J401, J402) Place the Model 1728 in position on the ing care to orient the connectors as shown. Replace the connectors from the spacers with the pack oriented as shown in Figure 7. Turn over the instrument with Replace the top cover. top cover to the circuit board. the bottom cover facing up and tighten down the four slotted-head screws. I B 2-3 INITIAL PREPARATION INSTRUCTION MANUAL Digilal Mullimeler Models 172. 173 J402 a..-- .~ FIGURE 6. Model 1728 Rechargeable Battery Pack. I INSTRUCTION Digital Multimeter Models MANUAL INITIAL PREPARATION 172.173 WARNI NG t Disconnect Line voltage HAZARD. the is line cord on the instrument present at various places FIGURE CB 7. Installation before on the of the Battery Pack circuit board and Battery is installed, is a SHOCK Pack. 2-5 INITIAL PREPARATION INSTRUCTION MANUAL Digilal Multimeler Models 172.173 Summary TABLE 2-2. Batteries Used of Description 7 +19.2V (l6-l.2V pack cells) 1 -19.2V (16-l.2V pack cells) I the Model 1728 Keithley Voltage Quantity I 2V “C” ccl I (; AMP-HR) in 8.4v I +19.2v Part No. BA- 30 I BA-31 I -19.2v BA-3 I CAUTION A The the Model 1728 pack should 2. How to Check is shipped be installed from in the factory the Model in an uncharged condition. 172/173 and charged prior Therefore use. to Batteries. LO BAT indicator to permit easy determination a) The Model 172/173 has a built-in of battery condition. The Model 172/173 also has an individual test point on the bottom panel usually needed only for troubleshooting purposes (see Figure 4.). b) The LO BAT indicator will be lighted when the operating voltage. When the indicator turns on the to LINE or OFF to permit recharging of the Pack. C) suring The test point instrument. may be checked at any time Then voltages are summarized Battery Model Pack 172/173 using the Model in Table 2-3. goes belag normal should be s,+jitched 172/173 or other mea- IMPORTANT The instrument must be operated in BAT mode in order to obtain a valid battery condition at test point “A”. This will ensure that the batteries are supplying power to the instrument. If the voltage is measured when the Model 172/173 is operated in the LINE mode a different reading may be observed since the batteries are being charged. Summary Test Point I’A” of Acceptable Battery TABLE 2-3. Voltage Battery Levels Range ) ITV + t20.5V Levels (BAT mode) Recharge if Below Normal +19.2 Battery Tested BT402 ITV The Model 1728 provides built-in recharging cir3. How to Charge the Batteries. Recharging occurs at cui try. The Model 172/173 must be connected to line voltage. the recharge time Typically, most rapid rate when the Model 172/173 is set to OFF. 2.5 hours per hour of discharge. the is CAUT I ON A 2-6 Overcharging may shorten the batteries the life of the will raise batteries. the internal temperature of the battery pack and CB INSTRUCTION MANUAL OPERATING Digital Multimeter Models 172. INSTRUCTIONS 173 SECTION 3- 1. GENERAL. for measurement This section of voltage, 3. provides current OPERATING INSTRUCTIONS information and resistance. needed to operate HOW TO SELECT POWER. The Model 172/173 may be powered 3-2. chargeable nickel-cadmium batteries (when the Model 1728 is 173 has a built-in line-voltage power supply and power cord. the from line installed). Model 172/173 voltage or reThe Model l72/ NOTE The accessory llodel 1726 Rechargeable Battery Pack may be ordered purchase of the Model 172/173 or may be purchased and field-installed time if so desired. The Model 1728 features plug-in wiring and, modifications need to be made to the Model 172/173 chassis. a. How to Operate from Line Power. age over four ranges from a minimum of summarizes the line voltages permitted. I . Set the 2. Plug 3. Depress internal the line line cord The Model 172/173 can 90 V rms to a maximum voltage into switch source of to line either ll7V at the time of at a later as a result, no be powered from line of 250 V rms. Table or volt3-l 234V. power. LINE pushbutton. NOTE Power on will surement unit be indicated showing. by a lighted How to How to Operate from Model Battery I. Install the 2. Depress BAT pushbutton. hoz;s If to 1728 one or more and mea- -; <<For these ranges the leads must be rewired NO Yes digits _. Transformer Modification:‘: yes ;‘; ll7V 117v 234V 234V go- 105V lO5-125V 195-2lOV 210-25ov with TABLE 3-1. Set Line Voltage Switch 5601 Range Desired b. display 7: NO Power. Rechargeable Battery Pack. (See Section 2, the battery pack must be charged LO BAT indicator is lighted provide fully charged opera;ion of the Model 172/173. page Z-3.) a minimum of 16 NOTE To charge the Model 1728, release both LINE and BAT pushbuttons and connect the line cord to line power. If it is desired to use the Model 172/173 immediately, depress LINE. The Model 172/173 will be useable for measurements although the battery charging rate is decreased considerably. 4. used CB If for the LO BAT indicator measurements. is not lighted in BAT mode,the model 172/173 may be 3-l 3PERATING INSTRUCTIONS lNSTRUCTlON MANUAL Digital Mullimeler Models 172, 173 NOTE The Model 1728 is shipped from the Model 1728 should be installed and been charged for at least 16 hours, for at least 6 hours. Summary of factory in uncharged condition. Therefore the charged prior to use. After the Model 1728 has the Model 172/173 can be powered continuously TABLE 3-2. Ooeration in LINE Condition Line Button Power Connected installed 1728 not Depressed LINE Line ON trickle Battery OFF OFF OFF Battery charged imum rate. I HOW TO SELECT FUNCTION. 3-3. V/A, and R d. rent DC. fu#lct This ions. pushbutton Function must be used is with 1. DC Voltage. Depress DC Release 2. DC Current. Depress DC Uepress AC. This fe Ict ions. b. rent pushbutton Instrument Line Power Not Connected 1728 installed OFF charged. ON Batteryslowly NE I THER LINE NOR BAT BAT Modes Power Connected 1728 installed ON BAT of and must be used with selected ON discharged. OFF at max- by means V/A to select of four pushbuttons AC, DC, either DC voltage or DC cur- either AC voltage or AC cur- V/A V/A V/A to select I. AC Voltage. Depress AC Release V/A 2. AC Current. Depress AC Depress V/A t. V/A. This pushbutton selects either voltage resistor is connected along with DC or AC, a shunt vide current sensing. d. {I. Depress0 to measure resistance. NOTE V or across current the HI A. When V/A is and LO terminals are interlocked so that only one pushbutton is DC. AC, and Sl pushbuttons depressed at a time. However, it is possible to have all pushbuttons out disconnects the input HI and LO terminals and no measurement can be made. R indicator will be lighted in this instance.) depressed, to pro- which (The AA I INSTRUCTION I Dlgllal MANUAL OPERATING Models 8. FIGURE Front Panel Pushbutton The Model 172/173 provides 3-4. HOW TO SELECT RANGE. AmO/M4N pushbutton determines the ranging mode, where AUTO. When released , the in accord with the following a. range I. to to b. INSTRUCTIONS Mulllmeler 172. 173 less Model 172/173 rules. When the display exceeds 29999 the sensitivity and the decimal point When the display 2. greater sensitivity MAN. reaches and the When depressed the or downrange 172/173 to uprange Selection. automatic or AUTO = fully automatically manual ranging. automatic ranging. selects Model 172/173 upranges moves appropriately). the (that 02599 the Model 172/173 downranges decimal point moves appropriately). range is by using appropriate is, (that The it is placed in hold. The user can cause the the UP RANGE and DN RANGE pushbuttons. changes it changes Model 1. When DN RANGE is momentarily depressed the Model 172/173 will downrange one decade of sensitivity. Each time the pushbutton is depressed and released, one downrange will occur until most sensitive range is obtained. 2. When UP RANGE is momentarily depressed of sensitivity. Each time the pushbutton is ,occur until least sensitive range is obtained. I AA the model depressed 172/173 will and released, uprange one one uprange decade will 3-3 OPERATING INSTRUCTIONS INSTRUCTION MANUAL Digital Multimeter Models 172.173 3-S. HOW TO MEASURE VOLTAGE. 172/173 measures The Model ranges: 0.3V, 3V, 3OV, 300V and 12OOV DC (1000VAC). CAUTION input voltage depends on the range selected. continous input for each range on AC and damage to the instrument will occur. TABLE 3-3. Maximum Allowable Continuous Maximum allowable aqes or I. Set to DC Volts. 2. Set to AUTO. 3. 4. Observe the displayed digits, unit (mV or V). If no polarity b. AC Voltage. The Model volts (1000.0 display). The a 3 remains lighted, but all volts on the highest range. I. Set to AC Volts. 2. Set 3. Table 3-3 gives Do not exceed to (The polarity sign l72/173 detects ac voltages maximum display is 29999. other digits are blanked. AC indicator should Observe five the maximum these volt- +I0 microvolts/digit to When the display exceeds The display blinks above sign, decimal point indicated, a positive is in Input (The terminals BG-5 or accessory location, polarity and measureis implied. from IO microvolts rms to 1000 When the display exceeds 29933, The display blinks above 999.9 be lighted.) AUTO. to be measured between HI and LO terminals. Connect the signals designed to accept banana style plugs, such as Keithley part no. leads such as t+odel 1681 Clip-On Test Leads.) 4. or dc voltage Connect the Signal to be measured between HI and LO terminals. designed to accept banana style plugs. Such as Keithley part no. leads such as Model I681 Clip-On Test Leads.) ment are test DC. 172/173 detects dc voltages from The Model display). The maximum display is 29999. but all other digits are blanked. a 3 remains lighted, volts on the highest range. ,law.O 29999, 1199.9 are test ac and the displayed digits, decimal point location, and (The terminals BG-5 or accessory measurement unit (mV V). CB INSTRUCTION Dlgltal OPERATING MANUAL INSTRUCTIONS MultImeter Models 172.173 3-6. in two DMM is How TO MEASURE CURRENT. (MODEL 172 ONLY). The ranges: 0.3A, and ZA. The current is limited capable of displaying 2.9999A. CAUTION Model 172 measures ac and by the current fuse even The Model 172 is protected by a 2 ampere fuse on all ranges. be installed in a replacement Keithley Part No. FU-13 should holder. (See Figure 5.) A If the dc current though the the fuse is blown, rear panel fuse The Model 172 detects dc currents from ?I0 microamperes/digit to 22 DC Current. When the input exceeds 2 amperes, the current fuse will blow. When using the MAN mode it is possible to select 30A, 300A & 3000A Ranges,but 2A Max is sti)) the limit. a. .3”pZl-l?S. I . Set to DC Amperes. 2. Set to AUTO. 3. Connect the signal to Observe the displayed 4. ment unit (LIA, mA, or A). implied. be measured at the HI digits, polarity sign, If no polarity sign is terminal. decimal indicated, point location, a positive and measurepolarity is ac currents from 10 nanoamperes rms/digit The Model 173 DMM detects AC Current. When the display exceeds 29999, a 3 tobj amperes rms. The maximum display is 29999. remains lighted, but all other digits are blanked. I . Set to AC Amperes. 2. Set to Auto. 3. Connect Observe 4. PA, AC ma, or the signal (The to the displayed AC A). :I - be measured digits, /Ill at decimal ‘ql L FIGURE 9. CB AC indicator 1:; should be the terminal. HI point lighted.) location, lq and measurement unit (AC mV OAC .,,,A on okn 0,” OWU-I . Typical Model 172 Current Display (DCmAJ. 3-5 OPERATING INSTRUCTIONS INSTRUCTION MANUAL Digital Multimeter Models 3-7. HOW TO MEASURE CURRENT. (MODEL 173 ONLY.) The Model dc current in five ranges: 0.3mA, 3mA, 30mA, 0.3A, 173 measures and 3A. 172.173 ac and CAUTION The Model I73 DMM is protected blown, a replacement Keithley fuse holder. (See Figure 5.) a. The Model DC Current. The maximum display amperes. lighted, but all other digits 1. Set to 2. Set to AUTO. 3. Connect by a 3 ampere fuse Part No. FU-2 should on all ranges. be installed 173 DMM detects dc currents When the display is 29999. are blanked. from ?I0 exceeds If in the the nanoamperes to 13 a 3 remains 29999, DC Amperes. the signal to be measured 4. Observe the displayed ment unit ( A, mA, or A). implied, If at the HI digits, polarity sign, no polarity sign is terminal. decimal indicated, point location, a positive and polarity The Model 173 DMM detects ac currents from IO nanoamperes b. AC Current. When the display exceeds 3 amperes rms. The maximum display is 29999. :o -emains lighted, but all other digits are blanked. I. Set to AC Amperes. 2. Set to AUTO. 3. Connect 4. A, Observe AC ma, or the signal (The to the displayed AC A). FIGURE 3-6 fuse is rear panel AC indicator be measured digits, 10. Typical should at decimal Model the HI point be measureis rms/digit 29999, a 3 lighted.) terminal. location, and measurement .AC OmV OV on 0ki-i OMa o,M .mA OA 173 Current Display unit (AC, (ACmA). CB INSTRUCTION MANUAL OPERATING INSTRUCTIONS Dlgltal MulIimeler Models 172. 173 HOW TO MEASURE RESISTANCE. 3-8. The Model 172/173 measures resistance fro-, 10 milliohms/d iq i t to 300 megohms. When the display erceeds The maximum display is 23939. 29999, a 3 remains lighted, but all other digits are blanked. a. HI Ohms Measurement. When the HI/LO pushbutton is released (set to HI), the Voltage developed ~CTOSS the resistance under test at full range js 3 volts, The Model 172/ 173 measures to 300 megohms in HI mode. For the 2 wire method the lower set of terminals is not used. I. Set to HI 2. Set to 2 WIRE. Ohms NOTE terr!iiials When the.Ilodcl 172/173 is set to 2 WIRE, the Iov~er set of HI and LO in;,ut set of HI il~~(l LO input terr;i~lals When set to 4 WIRE, the higher are not cnnncctcd. See Section 3-S for more detailed inforare used as “voltage sensing” terminals. mation. Set to AUTO. 3. 4. Connect the resistance 5. Observe MC). the displayed KR, or under digits, test between decimal the point upper location, b. LO Ohms Measurement. When the HI/LO pushbutton age developed across the resistance under test at full Model 172/173 measures to 30 megohms in LO mode. For terminals is not used. Set to LO Ohms. I. 2. Set to 2 WIRE. 3. Set to AUTO. 4. Connect the resistance Observe Kc!, or MR) the displayed digits, illustration is 5. This under test between decimal typical point of the For When measuring use the 4-wire a pair of IOft FIGURE iB of and is released range is the 2 wire upper location, a Z-terminal ifF-~/--qiy=j to example set set HI and LO terminals. meaSurement unit (c, (set to LO), the volt300 millivolts. The method the lower set of of and ohmmeter HI and LO terminals measurement unit (:., design. OHMMETER resistance less than 1OOOohms it may be necessary mode to eliminate the measuring error of the test leads. leads made from I8 AWG copper wire has 0.14 ohms resistance. 11. Typical 2 WIRE Resistance Measurement. 3-7 I OPERATING INSTRUCTION INSTRUCTIONS MANUAL Dlgilal Multimeler Models 172. 173 FURTHER MEASUREHENT CONS I OERATI ONS. 3-Y. a. DC Voltage Measurements. 1. Overloads. When the an overload condition. display exceeds ?lZOO.OV DC all digits blink to indicate 2. The input resistance is 1,000 HR on the 0.3V and 3V ranges; Input Resistance. The effects of circuit loading should be IO MC?on the 3OV, 3OOV, and 3000V ranges. considered when evaluating total accuracy of measurement. (See Accuracy.) The Model 172/i73 accuracy is specified in terms of 4 of reading and Accuracy. 3. For a full range reading of 299.99 mV DC the accuracy of measurement a % df range. would be + (0.03 mV + 0.01 mV) or +0.04 mV. Measurements from relatively high source. resistances could cause an additional reading error. The amount of error due to loading can be determined by the following relationship: % error = 100 x Rs i (Rs + RI) resistance in ohms Rs = source RI - input resistance of Model 172/173 in ohms Self-Check Feature. 4. The Model 172/173 has a rear panel Voltage test point for functional check of the Model 172/173 in DC Volts. To use this feature, connect.the input HI terminal to the rear panel white terminal. Verify a display of approximately 5 volts dc.To check dc current, depress V/A andverify a display of 1 mA. b. AC Voltage Measurements where 1. dicate 2. Overloads. an overload Input When the condition. Impedance. The display input exceeds impedance 1000.0 is V AC (t-m) 2 megohms The effects of circuit loading should picofarads. (See Accuracy. ) total accuracy of measurement. all shunted be considered digits by when blink less to than in- 50 evaluating the The Model 172/173 operates as an average-reading voltmeter, AC-to-DC Conversion. 3. The calibration is calibrated in terms of the root-mean-square (rms) of a sine wave. exact for sinusoidal waveforms in the specified frequency range. 4. Frequency mum and maximum Response. frequencies The frequency range given which accuracy is valid. The Model 172/173 accuracy is Accuracy. 5. Measurements from relatively and a % of range. The amount of error additional reading error. the following relationship: % error where in the specifications is the mini- specified in terms of a % of reading high source impedance could cause an due to loading can be determined by = 100 x zs fsZin Zs = source Zin = effective impedance input impedance of Model 172/173 The Model 172/172 has a rear panel Voltage test point for 6. Self-Check Feature. functional check of the Model 172/173 in AC Volts. To use this feature, connect the Connect the line cord to line voltage. HI terminal to the rear panel red terminal. Verify a display of approximately 6 volts ac. To check ac current, depress V/A and verify a display of approximately 1.2 mA. AA 1 INSTRUCTION MANUAL Digital MultImeter OPERATING INSTRUCTIONS Models 172, 173 c. Current Measurements. Overloads. I. Fuses Shunt Resistance. terminals at full 2. input For example, in a voltage are as follows: Model 172: The Model 173 develops range. The 172 has 1.3 on the 300 milli-ampere range the drop of 0.3 x 1.3 = 390 millivolts 2A Model 173: 3A approximately 300 millivolts R on all ranges. shunt resistor at full range. is 1.3 ohm, across which the results 3. Accuracy. The Model 172/173 accuracy is specified in terms of a % of reading and a pl of range. An additional reading error should be considered if the source resistance is not greater than 1000 times the shunt resistor. The amount of error can be determined by the following relationship: where d. Resistance I. sine HI 3. or resistance resistance. of the Model 172/173 Measurements. Maximum Allowable wave or t250V dc. Polarity 2. terminal. Rin = shunt Rs = source of Voltage Ohms. Input. The Model Maximum Open-Circuit LO ohms, the maximum The 172/173 maximum provides When the HI and developed between Voltage. voltage This illustration is typical using a separate Voltmeter combines these features. input should a positive not voltage LO terminals HI and LO is exceed at are open +5 volts. 250V the in rms HI either of a 4-terminal measuring technique The Model 172/173 and Current Source. “HI” “LOW” LEADS LEADS RSOURCE HIGH R SOURCE LOW When using the 4-WIRE method, connect one pair Connect a “current” leads to n SOURCE input. second pair of “voltage” leads to HI and LO. Then set to 4 WIRE. of Care should be taken to connect "current" leads and “voltage” leads properly. The LO terminal1 and R Source low must always connect to the same side of the unknown resistance. FIGURE CB 12. Typical 4 WIRE Resistance Measurement 3-v OPERATING INSTRUCTIONS INSTRUCTION MANUAL Digital Multimeler Models 172.173 Four-terminal Measurements. 4. The II-WIRE mode connects the lower set of R SOURCE terminals As shown in Figure I2 the lower terminals to the DMM ohmmeter source. are the current carrying terminals while the upper terminals are the voltage sensing terminals. This arrangementeliminatesthe error due to voltage drop across the current-carrying leads. Diode and Transistor Testing. The Model 172/173 can be used to 5. Semiconductor test diodes and transistors to determine the relative condition of the device. For semiconductor diodes, the voltage applied must be sufficient to cause conduction in the The “HI OHMS” mode provides a voltage up to 3 volts at a current “pto forward direction. I milliampere. Since the HI terminal is positive with respect to LO terminal, connections should be made as shown in Figure 13 to cause forward conduction of diodes. Since the maximum current is available on the 3 K:. range, depress AUTO/HAN (Set to MAN) and manually range to the 3 KI: range (down-range!. The Model 1;12/173 has a rear panel ohms Feature. 6. Self-Check functional check of the Model 172/173 in OHMS. To use this feature, Connect the HI terminal to the blue terminal. OHMS and 2 WIRE mode. of approximately IO kilohms. test point for place the DMM in Verify a display HI i TYPICAL TYPICAL DIODE FIGURE 13. Semiconductor Diode and PNP TRANSISTOR Transistor Testing. AA INSTRUCTION Dlgllsl Models MANUAL OPERATING INSTRUCTIONS Multimeter 172, 173 3-10. HOkl TO USE MODEL 172/173 OFF-GROUND. The "LO" terminal can be operated off ground at potentials of up to ?14OOV. Isolation from the "LO" terminal to power line Ty ically, the isolation ground is specified at IOOOMR, or IO'ii (shunted by 300pF). resistance from LO to CND is two decades greater than 10qR (10 PI n). Because of this excellent isolation, ground results in very little operating the Model 172/173 off loading (from LO to GND) of a floating source. At IOOOV above ground, the Model 172/ 173 will require, typically, only IOnA from the source. The excellent isolation also accounts for the high common-mode rejection ratio of the Model 172/173. Even with the "HI" terminal driven and a source resistance of lkR, 1000 VDC (from HI to GND) will produce typically only IOuV DC error. This error voltage is determined directly from the ratio of the source resistance to the "isolation" resistance (See Figure 14). , - lOOOV - 10-sA V to"n across Ik = I x Iki: = IO-' x IO3 = 1O;VDC The "isol ation" capacitance frwn LO to GND is important when AC cornnon-mode signals are present. In the Model 172/173 this capacitance is specified at 300 pF. At a frequency of 60~2, 300 picofarads has a reactance of approximately IOHR. With the HI terminal driven and a source impedance of lkn, a IOOOV p-p, 60 Hz, common-mode signal will produce a voltage of only IOOmV p-p across the input terminals. This IOOmV p-p signal will be further rejected by the input filter and A-D converter so that the total rejection at the digital display is at least 120 dB (HI d riven, IkT. source impedance). For DC voltage measurements, rejection is much greater than specified when the Model 1721173 LO terminal is driven, rather than the HI terminal. Where there is a need for even greater isolation from LO to power line ground, or where there is a need to float at potentials greater than 1400 volts above power line ground the Model 1728 Battery Pack should be used. r-------------I 1 I II:PlJl , I I l+L& I lKI! SOURCI SlSTANCL (7ERNAL :"IIQCF I I I I DIGllAL MULlIMEliF. , 10l'n * I -1 - TYPlCAL 1s~OLAllON RESISTANCE I 14. Use of L----------r Multimeter Off I I I GROiND FIGURE I I I I Ground. I OPERATING INSTRUCTION INSTRUCTIONS MANUAL Digital Mullimeler Models 3-11. 172. 173 How TO USE OPTIONAL PP!IBFS AND SHUNTS. a. Model 1600 High Voltage Probe. Set the Model 172/173 to DC volts and 30 volt range. The input resistance on the 30 volt range is IO megohms so that no shunt resistor is needed. The Model 1682 has a 1OOO:l division ratio. For maximum safety review the instructions furnished with the Model 1600 probeabove 30kV, switch to the 300V range. CAUTION A The alligator clip (ground) age is not applied between occur if the alligator clip b. Model 1682 RF Probe. Model 1682 has a IVdc output 100 MHz. must be connected to the source low so that high voltlow and ground. Severe damaqe to the instrument will is not connected. Set the Model corresponding The 172/173 to DC volts and 30 volt range. to I V rms input over the range 100 kHz to IMPORTANT For use on the should be used 3 ‘volt and 0.3 3 volt range the banana since the Model 172/173 volt ranges. Model 1685 Clamp-On AC Current C. volt range. The Model 1685 provides rms input. Review the instructions sible accuracy. plug input adapter (with IO megohm resistor) resistance is >lOOO megohms on the Set the Model 172/173 to AC volts and 0.3 Probe. a 0.1 volt rms output corresponding to a I ampere furnished with the Hodel 1685 to achieve best pos- d. Model 1651 Current Shunt. Set the Model 172/173 to AC or DC volts (as appropriate) and 0.3 volt range. Connect the voltage leads to the Model 172/173 input terminals. Connect separate leads (not furnished) between the source and the Model 1651 hex-head bolts. The Model 1651 shunt resistance is 0.001 ohm which produces a sensitivity of I millivolt per ampere. AA INSTRUCTION Dlgllsl MANUAL OPERATING INSTRUCTIONS Multimeter Models 172, 3-12. 173 HOW TO USE THE MODEL 1722 DIGITAL INTERFACE. a. THE Model 1722 provides binary coded decimal outputs (8421) and range General. control lines. Outputs are open-collector positive true unless otherwise specified. The This accessory is available either "factory installed" or "field-installable". Model 1722 consists of a two-layer circuit with card-edge and mating output connectors. installation. b. I. Disconnect 2. Turn the 1?2/173 over line cord so that the from bottom line voltage, cover faces the instrument with covers together. the top cover facing remove the top cover to gain access 5. Carefully There are 2 connections between the top cover and the be temporarily removed in order to free the top cover 6. Remove the Model 1728 Rechargeable Battery connectors from the mother board. disconnect up. slotted screws on the bottom cover as shown that is, they cannot be removed completely. Turn over and bottom 4. top Model instrument Loosen four are captive, 3. screws the the up, in Figure taking 4. care The to hold to the printed circuit board. main circuit board which must (see Figure 40.) Pack.(if installed). Carefully NOTE The Models 1722 and at the same time. 7. board as 8. 9. board, Check to see that shown in Figure Place the Model 1728 cannot the 16. four 1722 on the 11. Replace the 12. Reinstall 13. Turn the return wire connections the top instrument installed insulating spacers Lift up the Model 1722 slightly and plug in connectors JlOO3, Connect ground 10. transformer TIOI. be to the the as shown Model top cover. tighten the Model in in access JIOOI Figure to (in 1722 to 172/173 position on chassis the 16. the Model 172/173 order given). the circuit extra lug mother on cover. over and four The Model I722 uses two Connector Terminations. and PI101 (26-pin). Ribbon cable style of mating cardedge connectors as shown in Table 3-5. pi:j Sumnary I the spacersare to gain JlOO2, and from on Manufacturer of screws. card-edge connectors connectors ~1006 may be used with (40these TABLE 3-5. Mating Connectors Crimped Ribbon-Cable PllOl 3M 3462-0000 P1006 3M 3464-0000 Style 3-13 OPERATING INSTRUCTIONS INSTRUCTION MANUAL Digital Multimeter Models 172,173 J1002 J1003 AA INSTRUCTION Dlgltsl Mode18 MANUAL OPERATING Mullimeler INSTRUCTIONS 172,173 .~ 1’ c 3 \, \\ SPACER i (4 Places) '1 'J 3k-T ‘\ PI01 bllr”Kt CB IO. Installation of Model 1722. 3-15 1 OPERATING INSTRUCTIONS INSTRUCTION MANUAL Digital Multimeter Models 172,173 Sumnary Pin No. I I Signal 1 4 10 II I Pin Signal 21 104-2 103-l 104-l 103-l lo*-8 101-8 IO’-4 101-4 27 28 R4 16 .t; 19 20 lo”-8 103-8 104-4 103-4 Summarv of OVERFLOW POLARITY TABLE 3-7. Remote Commands Command Pin CASE GND" COMMON COMMON AUTORANGED STROBE TRIGGER MODE AUTOMOOE STROBE HOLD OVERFLOW STROBE ~___ LOAD RANGE FLAG/FLAG STROBE Rl FUNCTION R2 3-16 No. VOLTS I AMPS R2 AC Rl OHMS No. ~1006 22 23 24 25 26 PRINTER HOLD -. .-- E T -15 Pin at CASE GND COMMON COMMON COMMON : 6 TABLE 3-b. Digital Output of No. 14 15 16 17 18 I9 20 21 22 23 24 STROBE 2 at PI101 Comnand RANGE STROBE R4 POLARITY STROBE R8 IO4 STROBE TRIGGER I03 StROBE FLAG RESET IO2 STROBE TR GGER MODE DISABLE 10 I STROBE AUTORANGED loo STROBE CB INSTRUCTION MANUAL OPERATING INSTRUCTIONS Digllal Multimeter Models 172.173 r_--__-_-------------- -I 2 4’ / I PIIOI I’ I 6 61@1?14161820222426 ; 1 m : ’ : : ; : 3 5 7 3 lll3151719212325 I : :1 I L--------------------J I , 2 PI006 I’ : ----- 17. FIGURE How to Select d. internal or external 2. the Jumper internal 6 e 1012i41618202~24262e303234~~384; ’ I ’ 11111111111111 I 1 1-----------------3 5 7 9 111315 II11I~IIIIIIi~ 1719212>252729313335373~ FIGURE Jumper I. the external 4 ’ Connector 18. Pin Card-Edge Connectors 8. When reference this jumper (+5V). for (Model The Jumper. and internal Vext Using Internal voltage references A. When this jumper reference Vext (pin Identification pt006 1727 Model pull-up ______ and Cable Set). 1722 may be wired resistors. (See for use with Figure 16.) is installed, ~1006). the pull-up resistors are connected to is installed, the pull-up resistors are connected to 8, Vext is connected to Jumper C. When this jumper is installed, The pull-up resistors are not connected in this instance. reference. reference is rated at 40 mA maximum. 3. PIIOI. internal +5V The +5 volt 3PERATING INSTRUCTIONS INSTRUCTION MANUAL Digital Mullimeler Models 172. 173 FIGURE 1 3-18 13. Location of Jumpers and Pull-Ups on Model 1722. AA INSTRUCTION MANUAL OPERATING Digltal Multimeler Models 172,173 Digital r Output TABLE 3-8. Lines Grouped INSTRUCTIONS By Function Name FUNCTION STROBE -AUTORANGE TRIGGER MODE LOAD RANGE FLAG RESET FLAG/FLAG CB STROBE 3-19 QPERATING I INSTRUCTIONS INSTRUCTION MANUAL Digital Mullimeler Models 172.173 I General Characteristics TABLE 3-g. of Model 1722 Digital Interface. I DIGITAL Logic: Data: OUTPUTS: BCD (8421) Open-collector 4 full digits, I partial positive digit (0, I, true 2, unless 3) and otherwise exponential specified. range code. 1 1 Function: 4-bit code (n, AC VOLTS, AMPS) Polarity: HIGH : +. Overflow: LOW s > 23333. : Autorange: LOW s range change. ! Automode: HIGH s autorange mode. FLAG (m): HIGH (logic “0” : no output change occuring. , Logic Levels: HIGH f open collector to output LO. LOW 5 closure to output LO. Output / device (2N5134) greater than 20V breakdown, <0.5V at 5mA sink (3TTL loads). Internal pull-up resistors may be installed on these open collector outputs. 4.7K minimum 5 volt power supply. value is recommended when using internal OUTPUT TIMING: Data is updated typically every 320 msec (non-trigger mode). Update I . is typically 1.2 msec. Data will appear at an output only if its respective time strobe is active. The FLAG will go low (Logic “0”) typically 2 msec before update and go high typically 100 usec after update. Data can be expected to be unchanging so long as the flag is high. If FLAG RESET is activated, the FLAG will reset (go to Logic “0”) until the end ~of the next data update. REMOTE CONTROLS: 1 Strobe: Strobe lines permit word serializing in 4-bit increments or multiples thereof. HIGH inhibits controlled output lines from conduction, LOW enables conduction. Range In: 4-bit exponential code. L& Range: Low enables remote ranging as set by Range code. Hold: LOW inhibits display update, output update and autorange (A/D continues conversions) . ( Printer Hold: Same as hold but grouped with outputs for convenience in interfacing printer. I Trigger Mode: LOW enables TRIGGER control. , Trigger Mode Disable: LOW disables TRIGGER. Trigger: LOW to HIGH transition initiates a new A/D conversion. Flag Reset: Low sets FLAG (FLAG) t0 LOW (HIGH), Control Logic Levels G Source Requirements: HIGH 3 either an open circuit or a voltage between +2.4V and 5V referred to output LO. LOW : closure to outcut LO I within 0.8V while sinking +T.6 milliamperes (ITTL load). When TRIGGER MODE, HE and LOAD RANGE code bits are all HIGH (inactive) the 172/173 is under front panel control. These REMOTE CONTROL inputs have priority and will override any front I panel setting once activated. ISOLATION: All digital outputs and remote controls are isolated from 172/173 analog input by 10’ 0 and 5OOpF, 1200 VDC, 1OOOV rms AC maximum. All digital outputs and remote controls are isolated from chassis ground by I06 R and 0.0l~F; 250V rms maximum. I I 1 AA INSTRUCTION MANUAL MUttbW!W Model8 172.173 OPERATING INSTRUCTIONS DiQllEd e. Detailed Explanation of TRIGGER MODE AND TRIGGER: (See schematic 28248E) 1722. When TRIGGER MODE is active (Low), output data play will not be updated. TRIGGER MODE enables Conversion starts within 1.6 milliseconds after Integration starts 120 milliseconds after start conversion. and disTRIGGER. TRIGGER. of HOLD: If either HOLD or PRINTER HOLD is low the output data and the display wi 11 not be updated and the FLAG wi I1 stay at HIGH (unless reset by FLAG RESET). LOAD RANGE : When LOAD RANGE is low the 172/173 will go to the range as set by the RANGE IN code (Table 3-10) at the beginning of the next conversion. As long as LOAD RANGE is held low each instrument will remain on its programed range overriding front panel UPRANGE, DOWNRANGE and AUTORANGE. RANGE IN codes programmed outside the 1 imi ts of table3-IO will result in the nearest valid range to that programmed. LOAD RANGE will always cause a DMM range change. However, the display and output data will be held (not updated) during TRIGGER MODE or HOLD. Referring to timing schematic 28249~,it is possible to just miss a REMOTE CONTROL update prior to data output. This can be misleading,especially in the case of HOLD. A HOLD just missed (unknown to the user), just before data begins to change,could result in erroneous data. To check if this occurred, it is suggested that the FLAG be examined no sooner than 10 usec after activation of the HOLD bit. If flag is low wait until it goes to HIGH before expecting the HOLD bit to have been accepted. Other REMOTE CONTROL bits such as TRIGGER MODE and TRIGGER, LOAD RANGE and the RANGE IN code can be kept active for longer than an output data update time, i.e. >3.2 msec to insure proper REMOTE CONTROL acceptance. REMOTE CONTROLS : TRIGGER MODE DISABLE: (See Schematic 28249D) A6 Model When in TRIGGER MODE and triggering into an autoranging condition, normal operation will give an output for each However, if range encountered during the autorange. this is undesirable the AUTORANGED output bit can be tied to TRIGGER MODE DISABLE and FLAG RESET. This will prevent the FLAG from being set and ignore further triggering until the final range is reached. 3-21 OPERATING INSTRUCTION MANUAL Digital Multimeter INSTRUCTIONS Models v Internal external resistors internal internal mended ext: LINE GROUND: 172.173 jumpers (user installedjselect internal or voltage reference for user-installed pullup for all open-collector outputs, or applies +5V to v (maximum external current load on +5v is Minimum pull-up resistor recomis 4.7K. GiGA). One pin on each GROUNDS: 4 pins for CONNECTORS: One ho-pin output digital card connector. outputs, edge and 2 pins one for 26-pin remote card control. edge. ENVIRONMENT : installed in a 172/173: Operating 0°C -25. Storage: Modifications f. lj’2Z in TRIGGER as follows: Also when to Model 172/173 Specifications. MODE, only the accuracy specifications HI n 3OOMQ Range: HI R 30tln Range: From LO fi 30M Range: LO n 3H Range: From 0.5% From 0.1% operating in TRIGGER 0.5% on 300MQ Hi 0.05% on 30Mn Hi Accuracy 1722.when 3-22 to 55°C. humidity to +65OC 1% of From 0.15% MODE, repeatability $I and R and of all other ohms ranges and operating in TRIGGER MODE. When operating for the top reading to of reading of of reading reading of 3OMQ Lo R ranges, 3MQ Lo n ranges. all other 80% @ 35’C. functions a 172/173 with two ohms ranges 1.5% of to 0.2% reading. of reading. to 1% of to 0.15% reading. of reading. readings may be up to: a change and is not affected by the Model AB I INSTRUCTION Dlgllsl Multimeter Models 172. MANUAL OPERATING INSTRUCTIONS 173 TABLE 3-10 MODEL 1722 RANGE t OUTPUT FUNCTION CODE (1) FUNCTION RANGE VAACQ 100 DC VOLTS v 3: 300 1000 I 0 0 101 4C AMPS LOW n I000 “v v v 001 R IO 1 1 ill 0 0 0 III1 IO IO IO 0 I Ill1 IO IO IO 0 I IO 0 l 0 0 I I AUTORANGE I I 0 I I 0 0 I AUTORANGE Ill1 0 IO 0110 I 300 mA 2 A 0 0 IO II0 I 300 R 3 kn 30 kn 0 0 0 0 0 0 010 0 II IO IO 110 Ill 0 0 0 0 0 IO 0 II I 0 IO I I Ill 0 AUTORANGE ! oC2) 1 0 I 0 I 300 kn 3 m 30 nfi 300 MR (I) Coding in this to LOW. Refer (2) Function (3) Note that except PUT RANGE CODE, AA 0 0 0 I IO I 300 mA 2 A 3 kn 30 ka code IO 110 Ill 0 0 0 oC2) 300 kfi 3 MI2 30 MC il 0 0 0 I IO 0 300 mv DC AMPS (EXP) 0 1200 101 OUTPUT RANGE CODE (I) %I R4 R2 Rl 300 mv 3.ov 30 v 300 v AC VOLTS COOING FOR MODEL 17-i’ FUNCTION table output for 0 is defined to be HIGH (POSITIVE) and remote control logic levels Model for i.e. 0 1 0 172 current is IO I 0 IO 0 1 Ill II0 I IO IO I1 IO IO IO 0 I 0 0 Ill1 I I IO IO IO 10 0 Ill 1 1 0 AUTORANGE 1 0 AUTORANGE 0 0 II IO 0 I 0 0 TRUE. "I" = HIGH and "0" = for definitions of HIGH & LOW. volts. of AUTORANGE CODE, INPUT t RANGE CODE is the compliment the INPUT RANGE CODE is the LOW TRUE BCO code of (EXP). the OUT- 3-23 OPERATING INSTRUCTIONS INSTRUCTION MANUAL Digital Multimeter Models 172. 173 TABLE 3-11 MODEL 1722 RANGE G FUNCTION CODING FOR MODEL I73 (Same as Table 3-loexcept as follows) OUTPUT FUNCTION CODE (I) I RANGE VAACR 010 AC AMPS '-24 011 OUTPUT RANGE CODE (I) (EXP) INPUT RANGE CODE (1) (3) R8 R4 R2 R~ R8 R4 R2 R~ I II 1 IO 10 IO 0 I IO 0 0 0 Ill 0 II0 AUTORANGE Ill1 1 0 10 IO AUTORANGE 0 300 3 30 300 3 PA mA mA mA A 0 IO 0 II0 01 I 1000 IO 0 300 3 30 300 3 VA mA mA mA A 0 I 0 0110 0 Ill 1 D 0 1001,g I I ll I 9 1 2 0 87 0 1 0 0 0 I 0 AA INSTRUCTION Dlgltal Multimeter Models 172.173 MANUAL OPERATING INSTRUCTIONS COMMENTS RELATIVE TO THE MODEL 172/173 SPECIFICATIONS. Above I ampere there is a 3-13. decrease in accuracy. This decrease in accuracy is due toself heatingand the temperature coefficient of the resistors that are used in these currents. This degradation in accuracy will not exceed those values that are listed in the specification sheet. However, prolonged operation at the high currents (for instance, 2 amperes on the Model 172, or 3 amperes on the Model 173) may give temporary zero shifts because of the thermals which are generated due to the self heating of the devices. AC voltage specifications are listed down to 1% of range. Below 1% of range an additional IO digits is added to the accuracy. This does not occur immediately at the 1% level, but gradually as the level is decreased, because the zero of the ac/dc converter is not very well defined. It has to overcome the threshhold level of various semiconductor devices (a MDS FET and diode). As a result there will typically be a IO digit offset at zero even with the input shorted on the 300 millivolt range and on the 30 volt range. The 30 volt range offset will be somewhat smaller because the noise will be somewhat less. For best accuracy use the Model 172/173 on whatever range gives the largest reading. Autoranging will accomplish this automatically. Although the manufacturers of the nickel cadmium batt3-14. MODEL 1728 OPERATING TIPS. eries used in the 1728 claim that their cells can be charged at a C/IO rate indefinitely, once a cell is fully charged, the energy fed to the cell is converted to heat, which If cells are overcharged at C/IO rate for extendincreases the temperature of the cell. Keithley recommends that ed periods of time’(weeks), this may cause cell degradation. the 1728 not be overcharged for extended periods to maximize useful battery life. Trickle Nickel Cadmium batteries also excharging should have no effect on useful battery life. If the 1728 is only used to operate the instrument for relatively hibit a memory effect. short periods of time (I or 2 hours) the 1728 may not be able to provide the full operating time of 6 hours. Do not operate the Multimeter in BAT mode after the LO BAT indicator is lighted. The discharge characteristic of Nickel Cadmium batteries is such that it maintains a fairly At the end of the discharge curve constant l.2V through most of its discharge cycle. After a given cell in the battery the cell voltage drops fairly rapidly to zero volts. pack drops to zero it is reverse charged by the rest of the cells in series with it. Although the cells used in the 1728 are guaranteed by the manufacturer to withstand reit is not a good practice to continually verse charge for 10% of their discharge time, reverse charge cells, as more rapid cell degradation may occur. The cells used in the 1728 should give a minimum of 250 discharge/charge cycles and Thus, based on daily useage (5 day week, one per typically 500 discharge/charge cycles. day) the battery pack should give a minimum of one year operation and typically two years. Longer life’should.be expected for less frequent useage. AB 3-25 I INSTRUCTIONS urtHATlNG INSTRUCTION MANUAL Digilal Multimeter Models 172,113 TABLE 3-12 Summarv of ITEM Fuses and Miscellaneous Replaceable - WHERE USED KEITHLEY :use, 3 AB/3 AG, l/4 A, Slo-Blo ll7V Line Volts FU-17 :use, 3 AB/3 AG, l/8 A, Slo-Blo 23411 Line Volts FU-20 ‘use, 3 AB/3 AG, I A, ‘use, 3 AB/3 :use, 3 AB/3 .op Cover Model 1728 FU-IO AG, 2 A Quick Model 172 Amperes FU-13 AG, Model 173 Amperes FU-2 (less 3 A Quick metalcal) lottom Cover (less landle (less insert) + :ubber Slo-Blo Parts PART NO. 27979C metalcal) 25727E 25729D Insert 260YOA Foot FE-IO - -26 AA INSTRUCTION MANUAL Dlgllsl Mullimeler Models ACCESSORIES 372.173 SECTION 4. ACCESSORIES This section describes the various GENERAL. with the Model !72/173 Digital Multimeter. 4-l. use accessories and options POWER OPTIONS. b-2. The Model 172/173 can be powered by line voltage or rechargeable Battery Pack (Model 1728). Other line voltage ranges described in Section 2. The Model 1728 is available factory-installed installable. ISOLATED DIGITAL OUTPUT. 4-3. The factory-installed or field-installable. (paragraph 3-12.) The Model 1722 and options occupy the 4-4. width) 1728 cannot same location Model be 1722 Digital Output Complete specifications IMPORTANT installed and used on the Model 172/173 MODEL IO10 SINGLE Interface is are given in a full for (105-125V standard) are available as or field- at the same time chassis. RACK MOUNTING. THE Model 172/173 can be rack mounted in either a single or dual mounting configuration. available rack available in Section since (I9 3 both inch RACK MOUNTING KIT Description: Application: The Model 1010 is a single rack mounting kit with overall dimensions 5-i/4 in. (133 mm) high and 19 in. (483 mm) wide. The hardware included in this kit includes a 19 inch wide panel and other miscellaneous hardware. The Model 1010 adapts one Keithley Style “K” instrument for Standard 5-l/4 in. (I33 mm) x 19 in. (483 mm) rack mounting with II in. (280 mm) depth behind the front panel. For dual rack mounting of Style “K” instruments the Model 1017 Dual Rack Mounting Kit must be used. Parts List: I tern I40. Illustration Description I Front 2 Support Plate 3 Bracket, Left 4 Bracket, Right 5 Slotted 6 Flat 7 Phillips AB - Panel (Shelf) Side Side #b-32 Screw, Washer, x 2-l/4 in. #6 Screw, #8-32 x l/2 in. 4-I INSTRUCTION 4CCESSORIES MANUAL Digital Multimeter Models 172. 173 Assembly Instructions: I . (Item Using I). two 2. Using four Phillips Phillips Panel 3 and 4) to Front 3. port 4. 5. dle 6. gether 7. holes a. ment I 4-2 Using Plate four (Item Assembly Screws Screws (Itw I). Phillips 2). of Screws rack 7) attach (Item hardware Support Slotted feet. Position Instrument on Support Plate. Using two to Support Slotted Plate. Screws FIGURE Front Panel left and right side Brackets (Items (Item 7). secure left and right side Brackets to complete except long) in. holes (Item 20. to attach (l-l/4 so that 2) 7), is Screws (Item (Item for “handle” of Instrument so that handle is Rotate can be removed completely if desired by separating Remove two near front Plate 5) Model used in bottom and two 1010 of Flat Single mounting of Instrument. toward rear of top and bottoto hold top Instrument Washers Rack Hountinq Instrument. covers.) and bottom align (Item Sup- with 6). secure (Hancovers two to- front Instru- Kit. AA I INSTRUCTION MANUAL ACCESSORIES Digllal Multimeter Model. 372. 173 MODEL I017 DUAL RACK MOUNTING KIT Description: Application: The Model 1017 is a single/dual with overall diwnsions 5-l/4 high and I9 in. (483 mm) wide. included in this kit includes panel, and other miscellaneous Parts mounting in. The hardware a I9 inch wide hardware. The Model 1017 adapts two Keithley 5-l/4 “K” instruments for’standard mn) x I9 in. (483 mm) rack mounting in. (280 mm) depth behind the front Style in. !I33 with Ii oanel. List: teni lo. kit (I33 mm) Qtv Description Req’d I Front 2 Support Plate 3 Bracket, Left 4 Bracket, Right Side 5 Slotted Screw, i6-32 6 Flat 7 Phillips Blank Panel Wasner, I 28092D (Shelf) I 28OY4C Side I 280968 I 280978 4 -_ 4 __ 4 __ I 28098B 8 Hole 9 Kep Nut, Plug 2 HP-20 ,“8 5 -_ x 2-l/4 in. ;6 Screw, Cover Kei thley Part No. Plate !8-32 x l/2 in. -I IlluStralion =? a cs f”TJj a handle. Loosen four screws on the bottom cover of the instrument, lift off the top cover and remove handle. Replace the top cover and tighten the four screws on the bottom cover 6. Remove two Slotted long) used to hold top and bottom covers toScrews (i-l/4 in. These screws are captive and a needlegether near the front feet on each instrument. nose pliers should be used to pull the screw out after it is loosened with a screwdriver. Position the Instrument so that holes in the bottom of the Instrument align with 7. the two front holes in the Support Plate. 8. Using two Slotted screws (Item 5) and two Flat Washers (Item 6) secure the Instrument to the Support Plate. AB 4-3 I ACCESSORIES INSTRUCTION MANUAL Digital Mullimeler Models FIGURE 4-5. Model PROBE AND SHUNTS. 172/173. The 21. Model following 1017 probes Dual and Rack Mounting shunts extend the 172. 173 Kit. capabilities of the MODEL 1600 HIGH VOLTAGE PROBE Description: The Model 1600 is 40 kilovolts dc. The probe megohms input resistance. a divider probe for measurement of high is optimized for use with a dc voltmeter voltage having up to 10 MODEL 1682 RF PROBE Description: 1682 is The Model 1682 is an RF probe for optimized for use with a dc voltmeter MODEL 1685 CLAMP-ON AC CURRENT PROBE Description: The Model 1685 is a clamp-on up to 200 amperes. The Model 1685 is p,ut of 0.1 volt rms per ampere. 4-4 measurement up to 100 MHz. The Model having 10 Megohms input resistance. current used with probe for measurement an AC voltmeter and of ac current provides an out- AA INSTRUCTION Dlgltal MANUAL ACCESSORIES Multlmeler Models172,173 MODEL 1651 CURRENT SHUNT Description: having 4-6. use of at The Model 1651 is least 100 microvolts CABLES AND CONNECTORS. the Model 172/173. a 0.001 ohm shunt for use resolution. The shunt The following MODEL 1683 The Model 1683 is Description: with interchangeable screw-on cables UNIVERSAL a set of adapters. The Model 1681 is a set of test plug and spring-action clip-on MODEL 1727 The Model 1727 is a cable Description: cable terminated by mating card-edge is 3 feet long (I m), and the Model test leads, 48 in. leads, probe. enable effective 40 in. (Im) in length, (1,2m) in length, terminated OUTPUT CABLE SET SHIELDED of 26- and 40- conductor ribbon The Model 1727-3 the model 1722. feet long (3,l m). CABLE 42 inches The Model 7004 cable is a shielded cable, by 2 tinned leads plus shield. Two banana Models 172/173. when both plug making analog O,l adapters low-level INPUT and m) long and are furnished voltage OUTPUT. is for connections The shield MISCELLANEOUS. MODEL 1725 MAINTENANCE Description: ability AP Kits LEAD KIT set consisting connectors to 1727-10 is ten Application: The Model 7004 cable is useful to the Model 7021'7029 Low-Voltage Scanner, may be connected to the GUARD terminal. 4-7. cpnnection TEST LEAD KIT DIGITAL MODEL 7004 Description: terminated use with TEST flexible MODEL 1681 CLIP-ON Description: by a banana and with an AC or DC voltmeter is rated at up to 50 amperes. The Model to adjustment 1725 contains a specially controls on the Model KNIT punched calibration 172/173 chassis. cover for access- 4-5 I INSTRUCTION MANUAL Digital Multimeter ACCESSORIES Models MODEL 702/7029 Description: be used I for PRINTER 173 LOW-VOLTAGE SCANNER The Model 702/7029 is a ten-channel low-voltage or remote scanning operation. manual, scan, MODEL 750 172, WITH MODEL 7501-1722 PRINTER scanner. The 702/7029 can INTERFACE AA INSTRUCTION MANUAL Digllel Mullimeter Models 172.173 THEORY OF OPERATION SECTION 5. THEORY OF OPERATION 5-l. GENERAL. This section contains circuit The description is broken down into 172/173. a. Input Signal b. Power Supply c. Display Board d. Durrent Board e. Battery Pack f. A/D 4. Digital description the following information for the major categories. Conditioning. (Model 1728). Converter Interface (Model POWER SUPPLY (SCHEMATIC 286560) 1722). f----c (OPTION) MODEL 1728 BATTERY PACK (SCHEMATIC 27903~) SHEET 3 OF 3 -&CHEMATIC 28656C) SHEET I OF 3 MODEL 173 CURRENT BOARD (SctiE~ATic 27478~) FIGURE 22. SCHEMATIC (OPTION) Overall Block Diagram 27902E 28019~ of Model 172/173. Model THEORY OF OPERATION INSTRUCTION MANUAL Digital Mullimefer Models 5-2. switching, INPUT SIGNAL overload a. Switching. function. Table CONDITIONING. protection, The interlocked 5-l summarizes (Schematic ohms converter, 27903E). pushbutton the switching switches scheme. Sumnary of Switch Style Line Push-Push I” Push-Push : out Push-Push / Line ~ ISetting IN ac/dc TABLE S-1. Pushbutton This circuit consists converter, and filter. set the DMM to the of 172. 173 input appropriate Switching Remarks I 1 DMM is j pack (if I DMM is pack (if if line DMM is powered by ac line power. Battery installed)has a trickle charge. disconnected from line power. Battery installed) is charged at maximum rate cord is connected to power. powered by internal Battery Pack. i DMM is disconnected I 1 I BAT Push-Push j Out i / 1 1 I -__-~-I-~ AUTO/MAN I j ( .-UP I L ~ Push-Push I” AUTO/MAN Push-Push Out DN Range Momentary In Range Momentary I” __--__ “Interlock I” --__ I” “Interlock 5-2 I” from Battery Pack. NOTE Interlock preveots both pushbuttons IN at the same time. Both pushbuttons must be set to OUT before either can be set to IN. PushPush means that a single depression will place the pushbutton to IN, a second depressoon will release the pushbutton to OUT. -DMM is set to MAN (Manual mode). To change range depress either DN RANGE or UP RANGE. See also REMOTE PROGRAMMING OPTION. DMM is set to AUTO (Automatic Ranging Mode.) DMM range is set automatically Momentary depression causes the DHM to down range one decade to lesser sensitivity. Operable only when AUTO/MAN is IN. __ Momentary depression causes the DHM to up range one decade to greater sensitivity. Operable only when AUTO/MAW is IN. %%Ts set to DC mode. Overrides AC and n functions due to interlocked pushbuttons. Overrides DC and R DMM is set to AC mode. functions due to interlocked pushbuttons. DMM is set to R mode. Overrides AC and DC functions due to interlocked pushbuttons, also overrides V/A switch. t 1 - j i AB I lNSTRUCTlON Dlgilal Models MANUAL THEORY Mulllmeler 172, OF OPERATION 173 TABLE 5-1 (Continued) Summary of Pushbutton Switching Switch '7;': Can be depressed and held IN simultaneously V/A Push-Push I" V/A Push-Push out Push-Push Push-Push I" Out H,,LO;::>:: ” , /LO Remarks ;'NOTE If DC, AC, and n pushbuttons are OUT simultaneously, no function will be selected, the input terminals will be open-circuited, and the DMM will display R. The displayed reading is meaningless. Setting i:‘l :; DNM DC). DMM DC). DMM DMM Only w , RE, 4 w , R E 5 :i i’ Push-Push I" Push-Push Out I Gain s set to measure current Not functional when set s set to measure voltage s set IS set (either to :I. (either to low ohms range. .., to high ohms range. functional when set to AC or AC or :+;b 2.: i:. DMM is sat for 4-WIRE ohms measurements. upper pair of terminals are used for VoltLower pair of terminals are age sensing. used for ohms source. Lower pair of terminals are useable only in 4 WIRE r. mode and are open circuited for all other conditions. DMM is Set for conventional Z-WIRE ohms measurements. Upper pair of Terminals must be used. Lower pair of terminals are open-circuited. L Chart TABLE 5-2. For AC/DC Voltage RANGE CONTROL LINES RANGE AB ATTENUATION A/D GAIN RL H 300 mV +l Xl0 +a v -12 V 3v il Xl +8 v -12 v Xl0 ov -12 v Xl ov -12 v Xl ov -8 v 30 v +I00 300 v SIOO 1000 v ilOO 5-3 EORY OF OPERATION INSTRUCTION MANUAL Digilal Mullimeler Models 172.173 DC Volts input Circuit. DC Volts input circuitry is used to attenuate I. A combination of attenuation It unwanted AC signals. See Table 5-2on page 5-3. ive ranges of DC Volts. There is no attenuation 2. The mown in this position. rester than 109 ohms. on the attenuator and gains filter allows is of There are two attentuation attenuator. C9Ol assures AC attenuation with Q901 on. is maintained. RL line controls K901 and Overload protection is assured by the clamp 4. sltage is applied on the 300 m V or 3 V ranges, As RY29 absorbs the input voltage. fter R929. 307 keeps the relay voltage from becoming large Tihe clamp is essentially an open circuit between Filtering input if necessary and A/D converter Relay KY01 (Figure 23) 300 m V and 3 V ranges. is bypassed which allows the input resistance relay KY01 switches in the Above 3 volts, 3. ilO0 with FET switch QYOI off and +I000 evels, f at least ilOO so that normal mode rejection line controls QYOl (See table 5-2). . the circuit, the clamp the relay enough to ?5 Volts. If a large RY29, and C907. limits the voltage to i5 V switches in the attenuator, cause arcing or plazma effects. Circuit. It is a 3The DC filter is used in front of the A/D Converter on all functions. I. ale active filter with 3 db frequency of 5Hz and a settling time of less than 300 ms It requires an input resistance of 200K9, bY.YK< of which is RYl8. o within 0.01%. he other ISOK!? comes from various sources in the following manner: INPUT In DC Volts, In I" AC Volts, il 300 30 all , all m V and 3 V range: V and 300 V range: ranges: R801 ranges: RY.28 -.OluF FIGURE j-4 RY2Y, RYlY + R908 + RYll+RYl0 23. DC Volts Input Circuit. AA i INSTRUCTION Dlgltal Multimeter Models 172. MANUAL THEORY OF OPERATION 173 This ZOOKR is also maintained so that the etfect of A/D input current is autozeroed (See A/D discussion, section 5-7). The DC filter contributes no DC offsets to the path. They are blocked by C905 & C904. R922, R917, C902 G U901 complete the filter circuit. R92lisacurrent limiting resistor and C903 frequency compensates U901. out signal AC Attenuator. d. 1. ered 2. with relay (see AC voltages and passed on are to first the attenuated A/D converter. The AC attenuator (Figure 24) is maximum gain of unity. Its other K801 and FET ~804 respectively. table 5-2). 3. pressure voltage if necessary, converted from AC to DC, then filt- really a frequency compensated summing amplifier gains are ~100 and +lOOO which are switched by RL line controls K80i and H line controls ~804 C908 blocks DC signals up to +-lOOOV, so that AC signals of DC voltages. The attenuator is referenced to -6 on ~808 and C809 (figure 25) near zero. may be looked Volts to keep at the in the DC bias -Rf (1cjwRiC~i) -2 f Ri (l+jwRfCf).By making the RC time constant The gain of the attenuator is TN= of Zf equal to the RC t im constant of 2 IN, the gain of the attenuator is constant with -. This is true in the midband region. Low frequency is and equal to frequency, frequency by ~803. Nominal ~908 and RIN (R818) and high limited by RC time constan R!‘of values of resistance and capacitance are shown in Figure 24. 4. Amplifier ~803 is powered from +3 V and -15 V. agz*at the output is -6 Volts which keeps DC voltage minimizes settling time when autoranging. e. When overloaded off of C808 and the average This C809. volt- AC Converter. The AC converter is a transconductance amplifier. The simplified 1. the basic operation. The AC input voltage (Ein) is converted to a current of the summing amplifier configuration. This current flows through the and through the diode when positive. Thus Eout is a half wave rectified polarity is negative. Eout is the input current flowing through Rout. of the converter amplifier is referenced to a negative voltage to allow across the FET (~801). 2. The ac Q801, diode is ~812 and FET Q801 is FET is driven circuit shows (Iin) because FET when negati* signal if the The + terminal voltage swing converter consists of dual FET Q803, operational amplifier ~801 and HOSFET The input resistance CR801, and transistor ~802, semiconductor elements. R807, and the output resistance is ~802 in series with ~803 adjustment pot. located in the feedback loop of the converter amplifier and the gate of this from the output of the amplifier for one polarity. polarity the feedback path for ~801 and input FETs Q803 (a,b) is 3. For the other is positive at the input through diode CR801 and transistor ~802. When the ‘ignal side of ~812, current flows into the summing junction of the amplifier which is the gate This turns on (Pin 3) of ~803 and this current causes the output of Q8Ol to go negative. the base emitter junction of Q802 and pulls current through diode CR801 so that the connection path is through ~812, R807, CR801 and ~802 emitter to collector to -15 volt The reason that Q802 is a transistor and not a diode is to equalize the output SUPPlY. and avoid any parasitic oscillaload on amplifier ~801 in each of its two polarities, tion which might occur in ~801 because of unequal output current Loading. AA 5-5 Tt iORY OF OPERATION INSTRUCTION MANUAL Digital Mullimefer Model* 172.173 TO AC CONVERTER 0 I K801 158.4 pF \ 4804 24. FIGURE Simplified AC Attenuator Circuit. Eout -lin C808 Ein t- lin ~809 Rout 4 --l(--AANbRin ~802 ~803 r ~812, R807 k”’ +lin ~802 -V FIGURE 5-6 25. AC Converter Circuit. AA 1 INSTRUCTION Dlgilsl MANUAL THEORY OF OPERATION Mulllmeter Models 172. 173 4. When the input voltage is negative to the input side of R812 the current will flow out ~807 and ~812 and thus the output of Q801 will go positive, thus forward biasing the gate of Q801. This turns on Q801 pulling current through resistors R802 and ~803 from signal ground. Thus Q801 only conducts for negative input signals and the output current is a half cycle sine wave of negative polarity. This output current flows thru CbO3 filters the DC voltage. and ~802 which This filtering action allows the necessary 3 V DC with only 6 volts available from Q8Ol. Without ~803, more than 9 V swing would be The transfer gain of the AC converter is unity. needed. One volt AC RHS sine in causes I Volt DC out. with source resistors R805 and R806. 5. Q803 is a dual FET used as source followers The 10 m V adjustment feeds a small correction current to the summing junction to adjust for leakage current errors. The I Volt IKHz adjust calibrates the system gain on the 300 m V and 3 V ranges. Additional output filtering is provided by the DC filter (Section 5 C) whose input is R801 & ~801 in this case. 6. The only blocking converter. They keep reaching the output. capacitors needed are voltage offsets of ~803 C808 and C805 on the input of the (AC attenuator) and Q803 and ~801 7. The AC System common is the -6 Volt reference. ~802 and input divider ~811 and R810. C807 is used between 6V and signal lo to minimize AC noise to It is composed provide a low of voltage impedance AC from follower AC path pickup. Ohms Circuit. f. A summing amplifier configuration is is a current generator. I . The ohms circuit The current is generated by applying a reference voltage to the input resistor of used. the summing amplifier and connecting the unknown resistor in the feedback loop of U702 Refer to Figure 34a. Either the to force the current through the unknown resistor. 3.3444 V or the .33444 V reference is connected to buffer amplifier U701 thru, switching The output of the buffer drives one of three resistors (3.3444K, FETs Q702 or Q703. 334.44K, 33.444MG) to give six decade values of current from 10 “anoamperes to I milliEach resistor consists of a” adjustment potentiometer, and thus six ohms ranges. .3tllpere, a fixed resistor and the on resistance of a FET (no FET for 33.44&M:;). 2. which 3. which High ohms puts the A/D can turn on semiconductor Low ohms do not puts turn converter on junctions the A/D converter on semiconductor the for on the junctions allowing 3 Volt range, on scale readings. 300 m V range, for on scale allowing readings. 6 resistance ranges 6 resistance ranges See Table5-3. drifts associated with amplifiers U701 and U702. 4. There are time and temperature The reference used to calibrate These effects are compensated for by the A/D converter. Therefore, any drift in U7Ol is the A/D converter in R function is the output of U7Ol. The negative input of U702 is what “auto” compensated for every conversion cycle. the stability of the ohms Therefore, zero” one is calibrated to every conversion cycle. The lead drop in the current is a function of only the stability of the R resistor. high terminal of the ohms source amplifier is compensated for by connecting it to “Auto-zero” 2 is the zero for the input signal. “auto-zero” 2 when in the ohms mode. In 2-wire ohms the leads connect at the front panel binding post. Therefore a 4-terminal See Section 5-9. ohms system exists up to the front panel terminals. A6 5-7 iEORY OF OPERATION INSTRUCTION MANUAL Digital Multimeter Models 172.173 The ohms switching FETs (Q703, Q702) are driven 5. by transistor Q701 and the C-line, Q710 is driven from the A-line and Q707 is driven from the B-line. These lines are also used and decodes to operate the Model 173 autoranging current. Amplifier U702 is a FET input amplifier. This amplifier is overload protected by Q709 base emitter junction connected to the signal ground, and Q708 base emitter junction connected through Q706 clamp transistor. Thus the input swing is clamped. Very large voltage excursions on the output side of U702 are allowed. This is done by Q704, Q705, and CR703. Under normal operating conditions Q704 is operated in the saturated mode, However, under overload conditions, Q704 becomes a current source with its collector to emitter breakdown handling large voltage excursions when signals are positive with respect to the ohms source high. However, if signals are negative with respect to the ohms source high, CR703 reverse biases, cutting off that portion of the circuit. All of these high voltages will cause current to flow through R703 (IZOKR) which is connected to the +I5 The maximum limitation of 250 volts rms is a function of the power rating volt supply. of R703 (a half watt resistor), and Q704’s 400 volt breakdown. TABLE 5-3. OHMS RANGES I I RANGE HIR RANGE R LOR 300:: 3;: 300K 3M 3OM 300M REF “I 3.3444K 3.3444K 334.44K 334.44K 33.444M 33.444M 3:: 300K 3:: OHMS I CURRENT 3.3444” -33444” 3.3444” .33444” 3.3444” .33444” RANGE LINES I mA IOOuA IOuA IvA 100 nA IO nA / 9. Range Selection. Ranging is accomplished by RSA t RSB lines going to LSI by the front panel switches AUTO/MAN, DN & UP, according edge sensitive, causing range changes when their levels uprange or one downrange per button push. circuit UlO3. to Table 5-4. are changed. They are controlled RSA & RSB are This causes one TABLE 5-4. Range Selection Range AUTO/MAN UP Range RSA Lines RSB Action OUT X X 0” +8” AUTORANGE IN OUT OUT 0” 0” HOLDRANGE IN IN OUT +8v 0” DOWNRANGE IN OUT IN +8” +8” X E DON’T 5-8 Switches DN UPRANGE CARE AA INSTRUCTION Digllsl MANGAL THEORY OF OPERATION Mullimeler Models 172, 173 h. Function Switching. TABLE 5-5. Function Select FUNCTION SWITCHES AC i: V/A inn FUNCTION AC/DC FUNCTION DC DC” IN OUT OUT OUT X +8v +8v DCI IN OUT IN OUT X +8v +8v ACV DUT IN OUT OUT X 0” AC I OUT IN IN OUT X +8v +8” Hln OUT OUT X IN OUT ov 0” LOI! OUT OUT X IN IN 0” +8v X s Function to Table DON’T LINES 0” VI +8v +8” (172) 0”+;;73) +8v (172) 0” (173) +8” +8v CARE selection 5-5. c H I /LO is accomplished The function lines by connecting function are level sensitive. lines R, AC/DC, & VI according POWER SUPPLY, SCHEMATIC 28656E. This schematic contains the voltage regulators, line transformer, line voltage switching and power switching for the Models 172/173. There are three separate regulators used in the Model 172/173. One is a ?15 volt regulahas three percent accuracy, typically 0.1% regulation, and delivers tar , VR603, which +I5 volts at approximately a 65 milliampere level to most of the circuitry on the l72/ VR601, which is used as the positive supply to regulator, 173. There is also an 8 volt the LSI chip, (UlO3 on A/D converter schematic 27904F). There is also a +5 volt regulaThis regulator is used to drive the display, the digital logic circuitry in tar , VR602. the A/D converter, and all the relays. VR603 is a 215 volt dual tracking regulator. It is an integrated circuit with complete regulated circuitry and reference elements built into the unit. It is either driven by T60l transformer, or from ?19.2 volt batteries in the Model 1728 Battery pack. Connected to the transformer is a full wave rectifier, ~~602, supply + and - 30 volts unregulated to VR603. then two filter capacitors, C607 and ~611, These voltages are higher than VR603 needs because they are used to recharge the battery If the instrument is off but the line cord is powered, unregulated voltages are pack. generated. 5-3. If a Model 1728 battery pack 1728 will be charged through resistors, resistors ~604, R610, and drop the charging is installed in the Model the unregulated voltages. ~605, feed the charge inputs current down to the trickle When the instrument is in the 1 ine operated mode, the The -30 to R601, which goes to the + input of VR603. These resistors ~602 and goes to the - input on VR603. excess power, which is not necessary to be dissipated AB 172/173 the batteries of the Model When instrument is line powered, These on the battery pack. charge level. +3D volts unregulated is connected volts unregulated, passes through are used to absorb swne of the in the regulator. 5-9 i ‘HEORY OF OPERATION INSTRUCTION MANUAL Digilal Mullimeler Models 172, 173 The 8 volt regulator, VR601, gets its unregulated input from the unregulated Vt input on This input goes through a dropping resistor, ~~603, R606, to further reduce the voltage lown to an acceptable level for ~~601. The input for VR602 (5V regulator) is derived irom transformer secondary 7 and 8, full wave rectifier CR601 and R603. This voltage also changes the 8.4V batteries. In BAT mode, the t19.2 volt batteries and the +8.4 volt regulator, latteries connect to the input terminals of VR603 and VR602. VR6Ol ( the 8 volt ‘s fed through the 270 ohm resistor. The line switch applies ac voltage from the transformer to the Model 1722 for its regulated 5 volt supply. Thus, when the 172 or I73 are turned off the 1722 turns off. Transformer T601 has two internal shields, one secondary shield tied to pin IO, and one qrimary shield tied to power ground. This shielding provides line isolation. When the dual primary of T6Ol are tied in parallel by switch 5601, the Model 172/173 is connected Switch ~601 also puts these primaries in series, for 230 volt for 117 volt operation. as indicated on the schematic. Provision for 100 volt line is interchanging operation, connections 5 and 6 and connections 2 and 3 on the primaries. This is a physical wire change that must be made on the printed circuit board, and is a factory option. rhere are two connectors for the Model I728 battery pack, ~602 and P606. The self-check terminals are on the rear panel. There is an “a? self-check, “dc” self-check, and an “ohms” self-check. Connect from the appropriate self-check terminal to the input high terminal to exercise the instrument. The self-check is not accurate, the voltages and ~:urrents are only apptoximate. A battery test point on the bottom of the instrument alIars checking of the +19.2 volt battery in the Model 1728. Normally the low battery light will indicate when the batteries have become low and need recharging. However, it could be Jsed to troubleshoot for a defective cell. 5-4. DISPLAY BOARD, SCHEMATIC 27404D. This schematic shows the display digits, a. the LED function indicators, all display drivers and timing mux generator. The entire display, including minus sign and function indicators are fully multiplexed. This is accomplished with six time slots (timing mux). times are generated by shift register U3Ol whose inputs come from the LSI chip The mux (UlO3, Schematic 27904F). These time slots are referred to as to, t,, ~2, r3, t4, t5. The common anodes of each digit and the common anodes of the function indicators are driven from the appropriate mux line, See fiqure 26. These mux times are also used in operating digital interfaces (See Section5-8, 1722). The mux times occur in the sequence to thru t5, tg and t, are 383 microseconds each, and t2 thru t5 are 191 microseconds each. One complete mux cycle is 1.53 milliseconds. b. The data mux lines, a, b, c, d, segments and the function indicators. the LSI chip (UlO3, Schematic 27904F). e, f, g. and dp drive the cathodes See Table 5-6. The data mu lines of the display are generated c. The 10,000 digit only indicates 1, 2, or 3 in overrange. If the 10,000 digit is zero, it is blanked by the data mux lines. It is necessary to operate the function indicator and minus sign twice as long as the digits. Since “AC” and I’-” are activated the 10,000 digit time, tl is as long as to. juring tl, To keep the 10,000 digit the same brightness as the other digits, a,b,c,d,e and f data mux lines for this digit are for half of tl time. in on d. The anode driver transistors are saturating switches (Q301 thru Q306). The segment driver transistors are emitter followers (Q307 thru Q314). R302A thru R302H are current limiting resistors. Segment current is approximately 30 milliamperes peak. 17303 & C3Ol decouple current spikes from the 5 volt power supply. C302 decouples U301 from CR301 and R304 prevent parasitic oscillation of segment driver transistors. power supply. 5-10 1 AB INSTRUCTION MANUAL Dlgltsl MultImeter THEORY OF OPERATION Models 372, 173 TABLE 5-6. Data MUX Lines. Display 8 LINESt5 DISPLAY t4 ‘3 t2 a a a I a a DRIVES SEGMENT OF INDICATOR LIGHT -_ ~~~ _~-. tl a for Off b b I ic ‘, d (b I b ic c d e e f f d d b 9 dp g dp / b for I Off id last other / C other mV/mA ‘, of tl , half. V indicator-173 V/A indicator-172 d Same as above. mA indicator-173 not used-172 f f j / AC indicator all of t, g g g / g for e Same as above. other “-” All indicator of t, I C indicator last Off : A indicator-173 not used-172 5 of ti k:: indicator half MT? indicator ov I OMSl’ POLARITY-- OA --- FIGURE CB indicator-172 uA indicator-173 not used-172 f dp half mV indicator-173 Same as above. e dp t,, c e dp t0 L! of last e / DURING 26. Digital Display Multiplex ! Scheme. 5- I I ’ iEORY OF OPERATION INSTRUCTION MANUAL Digilal Multimeter Models 172, 173 5-5. CURRENT BOARD. Schematic 27478D contains all of the current circuitry which is ( Nntained in the Model 173 and also in the 172. The current circuitry for the Model 172, I mown at the bottom of the schematic consists of a 2 ampere fuse and a one ohm resistor. it allows It is switched in front of the ac voltmeter or dc voltmeter for ac or dc amps. 200 milliamperes on the 300 millivolt range, and up to 2 amperes on the 3 volt range. / limit of 2 amperes limits the power in the I ohm resistor. The input impedance is Above I approximately I.3 ohms on both the 300 milliampere and the 2 ampere range. ampere the self-heating effect and TC of the resistor causes the reading error to ICreaSE!. rur Model 173 the voltmeter is held on the 300 millivolt range and resistors are switched by means of relays K501, 502, 503, 504, or 505. KS01 connects the input on the 300 I croampere range, K502 on the 3 milliamp range, K503 on 30 milliamps, K504 on 300 milli,ps, and K505 on the 3 ampere ranqe. The current resistors are connected in series. ix502 is connected to the high of the voltmeter (high sense). R510 goes to signal low (low The measurement is thus done four terminal. The 3 ampere range is adjusted with me). >tentiometer R512, the 300 milliampere range by R509, and the 30 milliampere range with Input protection is provided by diode bridge CR501, which limits the voltage to R506. Unity gain amplifier US01 guards 7 diode drops in either positive or negative polarity. ‘me center connection of these diodes. This assures good performance on the 300 microA 3 amp medium acting fuse ampere range which nas IO nanoampere sensitivity. limits the maximum current. The fuse is rear panel accessible. The relay drive tranistors are driven by U502. Spike suppression diodes across the relay coils prevent Jmage to the transistor drivers. Range lines from the LSI chip, lines A, B, and C autorange the ohms function, They are decoded in and the Model 173 current function. -:O to decimal decoder U502. See Table 5-7. There is a possibility of a small period of This will not present an open circuit ;me during ranging where all relays may be open. to the source because the diode bridge will conduct. DiodesCR507, 508, 509 block the Resistors “gnal lines, A, B, and C from reverse biasing the inputs of U502 when at -12V. ;l5, 516, 517, 513G, 513H and 513F are input dividers to drop +8 volts to 5 volts to Resistors R513D,C, A, B and E limit base current to the transistor drivers. protect U502. Resistors for the top three current ranges are adjusted in shunt rather than in series. lthough adjustment ranges are equal plus and minus from the nominal value, the adjustdnts are non1 inear. Resistors R5l 1, R508, and R505 limit the range of the adjustment The pots plus these resistors limit the adjustment range in the in one direction. U5Ol hasamaximum input current of 7 nanoamperes (less than 1 digit 2posite direction. 3 the 300uA current range). TABLE 5-7. 173 Current Rangina RANGE ACA t DCA I 300~A 3mA I 3A 300mA I 3A 5-12 RANGE RESISTANCE UGE LINE .EVELS B RELAY OPERATED A IKR KS01 +8v -12v +8v 1OOR KS02 +8v -12v -12v IOR KS03 -12v +8v +8v IO KS04 -12v +8v - 12v 0.1n -12v -12v +8v INSTRUCTION MANUAL THEORY Dlgltsl MultImeter Models 172. 173 5-6. MODEL 1728 RECHARGEABLE BATTERY PACK. The volts from nickel-cadimum batteries. ET401 and cadmimum packs which are fused by lA, 3AG Slo-Blo of seven 1.2 volt “C” cells and is also fused by has a built-in recharging circuit which operated DMH I ine-power supply. OF OPERATION hodel 1728 provides tl9.2 “OILS and +8.4 BT402 are 19.2 volt, .45 AH nickel fuses. ET403 is an 8.4~ pack composed a IA, 3AG, Slo-Blo fuse. The Model 1728 from iZ9.5V unregulated supplied by the BT40l Charging. a. BT401 is charged via a constant current from Q4Ol. Diodes CR401 and ~~402 and resistor R402 place a diode drop across R401. The resulting current is the maximum charging current. Diode CR403 prevents the battery from supplying current through The maximum charging current occurs only when the DWM is set to OFF. A trickle Q4Ol. charge is maintained when the DMM is line operated, The reduced current is obtained by. inserting a limiting resistor in series with the charging circuit (not shown on Schematic 26758~). ln full charge, the batteries are charged at a C/IO rate (45 mA for ET401 t BT402, & 200mA for BT403). When trickle charged, the charge rate varies according to line voltage G battery condition from a minimum of C/l00 rate to a maximum of C/20 rate. Thus I trickle charge may never fully charge the batteries, but is intended to put sufficient charge into them for short intermittent use. ET402 & ET403 b. BT402 & ET403 &argi ng. or Q40l respectively. These circuits operate they are powered byunregulated +29.5V. 5-7. a. ANALOG-TO-DIGITAL CONVERTER. (Schematic are charged similarly via a constant current from to the above circuit, except Q402 that 28656E). Introduction. as its name implies, performs the function of generating a I. The A/D converter, The basic funcdigital representation of an analog voltage applied to its input. This A/D converter tional blocks involved in this process are shown in Figure 27. has several distinct modes of operation, broadly grouped as “signal-measurement The signal flow in the signal-measurement mode mode” and “error-correct ion mode”. the transformation from is shown in heavy lines in Figure 27. It can be seen that The first block (V/F voltage input to display output occurs in two major blocks. Converter) generates a digital pulse train whose frequency is proportional to the The second block (digital chip) contains circuitry which counts the input voltage. incoming pulses for a fixed time period, producing a total count which is proportional to the average of the input voltage over that time period. The digital chip (a custom HOS LSI circuit) which performs the pulse counting 2. function also performs a number of other functions necessary for the analog-toDetails of the operation digital converter, and for other portions of the DMH. Howof this digital subsystem will not be given in the following discussion. various of its outputs which are necessary for the operation of the remaindever, er of the A/D converter will be referred to when necessary. AB S-13 THEORY OF OPERATION INSTRUCTION MANUAL Digital Multimeter Models 172, 173 3. The first step of the A/D conversion process, the Voltage-to-Frequency conversion, is performed using a principal known as charge balancing. The resulting output pulse train has the property that its average frequency over a given time period is proportional to the average of the input voltage over the same time period. the charge balance technique has the property that the digital output is a Thus, representation of the trueintegral of the analog input over any specified sampling time. The circuitry which performs the V/F~function is explained in detail in Section b. 4. The charge-balance circuitry described in Section b, although highly linear, has certain intrinsic scale factor and zero offset errors. In the complete A/D converter these errors are corrected for by the use of additional circuitry. This so-called Auto-Zero and Auto-Calibrate circuitry is described in Section c. Section d contains a description of overall A/D converter system operation, combining the circuit functions described in sections b and c into a complete A/D conversion cycle. FIGURE j-14 27. Basic Functional Blocks of A/D Converter. AB INSTRUCTION MANUAL THEORY OF OPERATlbN Dlgllal hlullimeler Models 172.173 b. Voltage-to-Frequency Converter. illustrates the basic simplified circuit shown in Figure 28 1 . The greatly principles Its operating waveforms are shown of the charge-balance V/F converter. in Figure 29. Assume the integrating capacitor voltage, Vi, to be initally negative. As the input signal current Ix is integrated by the capacitor, Vi rises and eventually becomes more positive than the threshhold of the comparator (time t1 in is a logical variable, then Figure 29.). The comparator output voltage V,, which rises to a logic ‘one’. At the next positive-going edge of the clock CID (time t2 in Figure 29), this ‘one’ is latched by the flip flop and appears as the latched output QR. A quarter of a clock period after that event, (at tj), the out-of-phase clock, Cl, goes high and enables the output of the AND gate,thereby turning on the For the next half clock period, from t current switch. Ji :;,& ii’; ;e;~;e;Y”;;;;ent I is forced to flow out of the integrating capacitor, Sometime (t,) during this reference current pulse, Vi VT to a negative value. c:osses the comparator threshhold in a negative direction and Vc goes to a loglcal (t,), the comparator voltage At the next positive-going edge of clock CID, ‘zer0l. The is still a zero and therefore the flip flop output also becomes a zero. current consequently is not turned on during that clock period, and in 2r ference fact stays off until the next time the integrator voltage once again rises above the comparator threshhold. Ix m”,, h COMPARATOR FIGURE AB 28. Basic Charge-Balance Converter. 5- IS THEORY OF OPERATION INSTRUCTION Digital Models MANUAL Multimeter 172. 173 2. For relatively large values of the input, the time required for the integrating capacitor to be recharged above the comparator threshhold is relatively small, and the charging-discharging cycle described will occur at a high frequency. For lower values of input current, the recharging time of the integrator will be correspondingly longer and the events described will occur at a lower rate. Thus the repetition rate of reference current pulses (and digital output pulses) is a function of the input curre,,t. Notice that the amount of charge removed from the integrating capacitor during. 3. each discharge cycle is equal to the product of the reference current, I , and onehalf the clock period. Through appropriate circuit design these two parLmeters can be made very stable, with the result that, whether the frequency of the discharge cycle is high or low, each increment of charqe removed (i.e., each reference current pulse) is precisely the same size. Since the total charge removed from the capacitor in any given time period is equal to the total charge that flowed in during the same time period (within a resolution of one discharge increment) the uniformity of size of the reference current pulse guarantees that the total number of such pulses is precisely proportional to the time-integral of the input current. FIGURE 5-16 29. Operating Waveforms of A/D Converter. AB INSTRUCTION MANUAL - THEORY OF OPERATION Dlgital Multimeter Models 172, 173 4. Figure 30 is .~ a simplified to perform the V/F conversion. already discussed, Figure 30 mentioned. a) high gain line schematic diagram of the c,ircuitry In addition to some added details shows three major circuit elements The input buffer amplifier, U202, serves two impedance input to the A/D converter. Second, of 10, giving the A/D converter in effect two labeled GIO (an output from the LSI chip). b) The transconductance MOS FET (QlO4) and resistors, buffer amplifier LIZ02 into integrating capacitor. amplifier, converts a proportional actually employed of the circuitry not previously functions. First it provides a it provides a selectable voltage voltage ranges, selected by the consisting of op amp UlOl the voltage which appears is current, Ix, which and its associated at the output of used to charge the The reference diode and the resistor connected from it to the summing junction c) of op amp UIOI provide a fixed current component of I in addition to the variable component I (which is proportional to the input voltsge). This fixed offset current, labeled I allows the overall A/D converter to handle both positive and With this arrangement, the output pulse frequency is one negative input vol?iges. half of its maximum possible value when the input voltage to the entire converter is zero. subtracting This transposi.~tion a fixed number is from accounted for the accumulated in the digital count before d) The remaining circuitry in Figure 30 is functionally details) to the basic charge-balance loop shown in Figure signals QR and CLK are used by the digital subsystem, in pulse train discussed in connection with Figure 28. Auto-Zero C. and Auto-Calibrate subsystem displaying (LSI it. chip) by equivalent (with some added The digital output 28. effect, to reconstitute the Circuitry. 1 . The charge balance system shown in Figure 30. is inherently highly linear, but both its zero and full-scale calibration (scale factor) are susceptible to drift with time and temperature, due to a variety of effects. Through the use of a pair of related circuit functions, referred to as Auto-Zero and Auto-Calibrate, these intrinsic errors can be cancelled, resulting in a system whose scale factor is essentially as stable as the voltage of a reference zener diode and whose zero The techniques used to stability is limited principally by thermo-electric offsets. achieve this performance are described in this section. 2. It as offset lifier summing lent to can be shown that all zero-error sources in the charge balance system (such voltage drift of amplifiers U202 and UIOI, input current drift of ampUIOI, etc.) can be represented as a total effective error current at the gain errors are equivajunction of amplifier UlOl. In a similar way, all an error current at the emitter of the reference current output transistor, Ql02B. It is thus possible to correct for all such errors by introducing an The approprrate correction current at each of these two locations in the circuit. function of the Auto-Cal and Auto-Zero circuitry, then, is to discover the proper values of these two currents and to supply them during the measurement of the input signal. ” the proper value of the correction signals is as The method used to “discover In an error-free system, a zeroConsider first the Auto-Zero operation. follows: volt input would cause the charge-balance loop to deliver reference-current pulses In the Auto-Zero mode, the fo the integrator at exactly l/2 the clock frequency. and the current switch is digitally buffer input is supplied with zero volts, forced to deliver reference-current pulses at precisely l/2 the clock frequency. In the current being delivered to the integrata real system with finite offset errors, 3. I THEORY INSTRUCTION OF OPERATION MANUAL Digilal Mullimrler Models 172.173 FIGURE 5-18 30. Simplifiea bcnematbc or V/F Converter. AB 5 INSTRUCTION DiglIal MANUAL THEORY OF OPERATION Mulllmeler Models 172,173 or through the transconductance amplifier (I ) does not exactly match this forced reference current; the difference exactly eq:als the correction current required to cancel the offset errors. Thus the integrator voltage, V., exhibits a charge balance sawtooth waveform like that shown in Figure 29., Superimposed on a much slower ramp whos.e slope is proportional to this difference current. The auto-zero feedback system adjusts a correction current which flows into the sumning junction of amplifier UIOI so that the slope of the ramp is equal to zero. In this way, all zero errors are oreciselv cancelled. 4. of The Auto-Calibrate detail: system a) The voltage supplied amount voltage which the switch half of works in an analogous to the input charge balance b) rather The current than one is it. forced to C) current The feedback correction current output transistor (QIOZB). manner, of buffer amplifier system can measure. a frequency is delivered equal to to the with three U202 is the emitter ‘; The circuitry which performs the operations described above is Figure 31, together with most of the charge balance system redrawn The added circuitry is grouped in five major blocks: 6. Input b) Reference C) Comparator d) Auto-Zero e) Auto-Cal This description the clock 5. a) differences exact frequency of the shown from reference in Figure 30. Multiplexer, current forcing circuitry, filter, feedback feedback circuitry of its will basic and and storage storage circuitry, circuitry. be described block mode of operation. by block with reference to the above “known” voltages to the input of The input multiplexer supplies the necessary =I and connects the buffer amplifier to the the buffer amplifier at appropriate times, The multiplexer consists of JFET signal source when that signal is to be measured. (the two adjustable capacitors switches controlled by signals from the LSI chip. to neutralize the JFET switching charge in shown in Figure 31. are used primarily order to minimize the A/D input current.) b) The reference current forcing circuitry controls the input of the comparator the output of this flip flop to In the Auto-Zero mode, it forces latch flip flop. The resulting reference alternate between one and zero on successive clock periods. current pulse rate is equivalent to an output frequency from the charge balance In the Auto-Calibrate mode QR is forced to a one system of l/2 the clock frequency. constantly with the result that the reference current is on at every opportunity; Two chip outreference-current pulse frequency thus equals the clock frequency. FON is oneduring FON and COFF, are used to control these two operating modes: puts, and COFF is zero during Auto-Zero and one otherboth Auto-Zero and Auto-Calibrate, wise. AB 5-19 rHEORY INSTRUCTION MANUAL Digital Multimeter OF OPERATION Models FIGURE 31. Simplified Schematic of Complete A/D 172, 173 Converter. AB INSTRUCTION MANUAL THEORY OF OPERATION Dlgltal Mulllmeler Model8 172, 173 labeled “Comparator Filter”, not previously mentioned, serves an C) The block important function in the Auto-Zero and Auto-Calibrate feedback loops. As discussed above, the component of the integrator voltage which is of interest for Auto-Zero and Auto-Cal purposes is the slow ramp arising from the effective error currents. Because this ramp has superimposed on it a relatively high frequency triangle waveform, the combination of comparator and comparator-filter functionsas a switchingmode (class D) amplifier for the ramp voltage, with gain equal to the ratio of the V, The comparator-filter’s function is to smooth switch to the triangle amplitude. the switching output of the comparator so that only the low-frequency amplified ramp signal is passed on to the remainder of the Auto-Zero (or Acal) feedback loop. d) The Auto-Zero feedback and storage block completes the control loop used to. generate the Auto-Zero correction current. Ignore for the mcment the two storage capacitors and consider only the direct signal path via the Auto-Zero loop switch and the JFET source follower. Consider the following circuit elements: Transconductance amplifier, switching mode amplifier (comparator and integrating capacitor, comparator f i 1 ter) , auto-zero loop switch, source follower and the resistor between FET source and UlOl summing junction. Examination shows that these circuit elements constitute a simple low-frequency and dc feedback loop which will strive to adjust the voltage across the integrating capacitor to a value near zero. Once this condition has been achieved, then the Auto-Zero correction current I must have taken on the desired value, since the total current being fed to the %tegrating capacitor must now be exactly balanced by the switched reference current. The remainder of the auto-zero system operation is quite simple. Once the stable closed loop condition has been achieved, one of the two capacitor switches is then closed and the gate voltage on the source follower (which has the value necessary to produce the correct value of I When the loop IS stored on that capacitor. gz’ switch finally opens at the en of the Auto-Zero phase, the value of I which AZ was established during the Auto-Zero phase thus remains in effect until the next Auto-Zero operation. ONE A/D CONVERSION P 4 S I GNAL I NTEGRATE * 200ms J \ SIGNAL MEASUREMENT ERROR CORRECTION FIGURE AB 32. A/D Converter System Timing. 5-21 THEORY OF OPERATION INSTRUCTION Digital MANUAL Multimeler Models 172.173 e) The Auto-Cal feedback and storage block works in a manner identical to that of the Auto-Zero feedback and storage block, with the exception that its output current is fed to the emitter of QlO2B instead of the summing junction of UIOI. Although the Auto-Zero and Auto-Cal correction operations interact to some degree, a few sequential iterations of these operations suffice to establish the correct values of the two correction currents. d. Overall A/D System In the preceeding 1. circuit block has been in which these elements is based on Figure 32, conversion. Operation. two sections the structure and explained. This section contains are combined in a complete A/D an overall A/D converter timing function of each major analog a description of the manner conversion. The description diagram showing one complete The first major division of the conversion period is into an error-correction 2. During the segment (120 ms long) and a signal-measurement segment (200 ms long). the input multiplexer supplies known reference voltages to the V/F block, former, are established. and (as described in Section c ) the correction currents I and I the now error-corrected V/F converter hatZthe un tl %%n signal voltage During the latter, (As the applied to its input, and its output pulses are counted by the digital chip. the chip processes the resulting pulse-count and disnext conversion period begins, plays the result.) The error-coirection segment of the conversion 3. three 40-msec. phases. During the first two of these gain is held constant at either IX or IOX (depending the input multiplexer supplies During the AZ1 phase, voltage, and the Auto-Zero feedback loop is closed. correct any (see Figure to be stored cycle is further divided into phases, the buffer amplifier on DMM range and function). the buffer with a zero-reference The value of IAZ required to system zero-err-ors is established, and the closure 31) causes the source-follower gate voltage which on the corresponding Auto-Zero storage capacitor. During the ACAL phase, 4. the multiplexer connects reference voltage (either 3.34 or 0.334 V, depending process results in a scale-factor correction voltage storage capacitor. of the produces AZCI this switch current the buffer input to a full-scale on buffer gain), and a similar being stored in the Auto-Cal Buffer gain during the AZ2 phase is always the same as it is during the signal5. measurement phase; it may differ from its value during AZI and ACAL. Because of the (possibly) changed buffer gain, the effective system offsets may have changed so the second Auto-Zero operation is required to prepare the V/F converter for an errorcorrected signal measurement. This new value of the Auto-Zero correction voltage is stored on the capacitor controlled by the AZC2 switch (Figure 31.). 5-a. MODEL 1722 DIGITAL INTERFACE. a. Overall Block Diagram. As shown in Figure 33 Serial data from the DMM and its associated clock lines are first isolated. Bidirect\onal data line SERDAT is then split. Output data DOWNDAT goes to the output register block where it is converted to parallel form and then to the output buffers. The clock lines go to the control block which decides where the data is going, out or in, and also generates the flag. i-22 AA INSTRUCTION Digltal Models MANUAL THEORY OF OPERATION Mulllmeler 172, 173 Control input data and strobes are first buffered by the input buffer block. The strobes go to the output buffer to gate the outputs. The control data inputs go to the input register and control block where they are converted from parallel to serial form and sent to the isolation block. The input register and control block also decides, based on control data input, whether there is to be an output update. Power isolation for the 1722 is provided by transformer TIOOI which is powered by a secondary winding of the DMN power transformer. b. Signal Isolation. The bidirectional data line SERDAT and the SERCLK and INCLK each drive an emitter follower made up of transistors and QlO37 whose loads are LED’s in the opto-isolators are pulled up RI009 and ~1018, which is driven by QlO34 similar to the three just put pullup on ~1018 is on the DMM mainframe. Power for the DMM side is taken directly from the DMM +5 volts through ~1016 and ~1018 and the coupling. plF;d Power Supply. via pins B and Low voltage C on JIOIA. ac from the secondary of the two clock lines 41036, QlO35, by resistors RIOIO, mentioned. The outof the isolatidn ClOl7, which provide DMM transformer is sup- Switching for the power for TIOOI provided at J1003 Pins A and B and comes via the Dtlti mainframe through its Power On switch. The secondary of TlOOl is rectified, filtered and rub through an integrated circuit +SJregulator TRlOOl, where it is again filtered by ClOl5, Cl002, ClOO3, ClOO4, ClOl4. The core of TIOOI is connected to chassis ground by a green wire to a screw on the DHM mainframe or transformer. Also common mode filtering is performed by RI008 and cl006 between output low and chassis ground. Control Block. d. UPCLK, the isolated form of INCLK, is run to the trigger input of El017 timer. A buffered version of UPCLK is also run via diode gate CR1002 to the threshhold input of UlOl7. UlOl7 is such that its output will go high when a falling edge goes into trigger. A filter made up of RI007 and ~1008 will try to charge, however, since this threshhold is clamped low through diode CRIOOZ. It will not be able to time out in the time period of the clock pulses on INCLK until the last rising edge of INCLK. at which time it will clock out at 30 microseconds, therefore UPTIME, the output of will be length of the INCLK pulse stream plus approximately 30 microseconds, UlOl7, which is the time in which data will be flowing from the 172 to the DMM. The beginning conversion (See Schematic 27902E). This is done by clocking DOWNCLK with UPTIME in flip-flop UlOl5A. The beginning of downtime also defines the time when the flag is set that is when data has finished being updated. Setting the flag lo,,; during data high, change time, or resetting the flag, is accomplished in two ways: FR or UPDATE. Downtime also gates DOWNCLK thru UlOl4C & UlO14D where it is called GATECLK and goes to the output register. The output regi’ster is made up of shift registers UlOO8A & 8, Output Register. IO;,, & B, IOIOA & B, 1011 A & 8. It is a 32-bit shift register, of which only 30 are Serial data enters U1008B and is clocked through all of the shift registers by used. At the end of the clocking time all 30 bits have been the parallel clock, GATECLK. shifted in and are presented in parallel to the output buffer. Parallel data on the output registers Output Drive and Buffer. f. Here they are gated with gates UIOOI thru 1007 and UlOl2 and 1013. and drive transistors QIOOI thru 1030 to output connector Rl006. Strobelines are buffered Input Buffers. 9. Remote control output drive and buffer block. UllO4 is a Schmitt trigger and is put u1105. triggering. by UIIOI and UllO2 inputs are buffered on certain control goes to output the output strobes and go out to the by UllO4. Ullll, lines to prevent false IORY OF OPERATION INSTRUCTION Olgltal MANUAL Multimeter Models 172.173 - : b FIGURE 33. Model 1722 Block Diagram 7 IEORY OF OPERATION INSTRUCTION MANUAL Olgltal Multimeter Models 172, 173 DETAILED 5-9. 4 WIRE OHMS OPERATION. a. The circuit u ing the voltage a summing amplifier t’ rough an input measures a resistor by putting a constant current through Rx and measdrop across Rx. This is accomplished by putting Rx in the feedback of (G AMP) the input to this amplifier being a reference (0 Vref) voltqe resistor (RR). a. AZ-I, ACAL, AZ-2, & A/D for time & temperature variation r sistance. The A/D looks at IT 2ner. I) AZ-I looks at Signal are the 4 A/D inputs. This A/D operation compensates of n VRef and R Amp, as well as compensating for lead each of these inputs in time sequence in the following !? AMP input for 40 ms and stores 2) ACAL looks at :: VREF for 40 ms and calibrates AZ-l and ACAL. Thus, it is calibrated to the voltage stable resistor the value of I is now known. Since is fixed. 3) zero AZ-2 level this zero itself across I flus to the difference between RG . Since Rc! is a fixed through Rx the calibration looks at the voltage at the top of Rx for 40 ms. for signal measurement and is stored in A/D. 4) A/D Signal looks the difference between Rx is displayed. c. The measurement and the voltage across level. This defined at the bottom of Rx for 200 m seconds. The A/D A/D signal and AZ-2 without polarity sign. The i’s essentially RR. a ratio measurement between the Note that the voltage at the top of Rx is essentially at signal d. ment (2 nAMP offset and lead resistance drop) and the voltage at the negative. Thus, the high impedance terminal is guarded and relative i ilieved at high resistance values. ,-26 is as the thus measures voltage across voltage across Rx LO of the instrubottom of Rx is fast response is AA INSTRUCTION MANUAL MAINTENANCE Digilal Mullimeler Models 172.173 SECTION 6-1. GENERAL. This section contains Included are procedures for Electrical shooting, and Battery Replacement and 6. MAINTENANCE. information Performance Charging. necessary Verification, to maintain the Calibration, b-2. REQUIRED TEST EQUIPMENT. Recommended test equipment for the instrument is given in Table b-l. Alternate test equipment specifications equal or exceed the stated characteristics. TABLE List of Test Eat lip Nment For T Performance Verification. DESCRIPTION A DC Calibrator +0.2 AC Calibrator 0.2 through 20 v rms ?0.022% + touv Voltage Decade Current Resistor Source Amplifier checking and maintaining may be substituted if 6-l. TEM High SPECIFICATION HFR V through +0.002% or 200V through 10.04% +lOOO Vdc 2ouv 1000.0 2Kci through 10.01% 200Mr. +O.l% 200uA 1OMR through 20 mA v rmr, j 200mA and 2A 20.02% 1070 21% 109n NOTE The equipment listed here in many cases will uncertainty in the Performance Verification. should be used when evaluating the displayed cc 25% I FLUKE HP I HFR MODEL I 343A , ~ 74bA ESI DBb2 CADDOCK 1 MG75C FLUKE 33306 FLUKE 382A KI 616 i 0.006% Ohmmeter instrument. Trouble- introduce an additional The Absolute Acc~lracy reading on the DHH. b-l INSTRUCTION MANUAL MAINTENANCE Dlgltsl Mulllmeler Models 172. 173 6-3. PERFORMANCE VERIFjCATION. Use the following procedures to verify basic operation of the instrument. All measurements should be made at ambient temperature of 25°C. and relative humidity less than 80%. If the instrument is out of specification at any point, perform a complete calibration as given in paragraph 6-4. For each function that is checked, an additional uncertainty due to temperature coefficient should be considered if the ambient temperature is different from 25” C. Example: If calibrated at 3O”C, add 5°C of temperature coefficient specification. NOTE This procedure is intended to verify in voltage, current, and resistance Xl0 better than measurement accuracy. Xl0 better than instrument accuracy available. a. in Battery Check. 1. Check for Figure 7 2. Depress 3. Verify b. How to sufficiently I. Set 2. (With proper the Model only the basic accuracy of the Model 172/173 Test equipment accuracy should be modes. In many cases the equipment listed is not because such equipment is not commercially 1728 installation of Rechargeable individual that the “LO BAT” Charge the charged.) the indicator is switch 5601 Connect the cord to the appropriate 3. Release LINE 4. Recharge for I6 hours line at Resistance Depress MAN. 2. Depress BAT. 3. Select 4. Measure Input 6. Select 7. Measure 8. Input in the installed.) battery pack as shown the the least the DC range input resistance the 30 volt input resistance If this procedure the appropriate line lighted, only line if recharge the batteries.’ batteries voltage are not range. voltage. should using fully charge. resistance be UP RANGE or between be >I DC range should to (DC VOLTS) 3 volt resistance to lighted. BAT. Check. I. 5. scale). and -not (Perform Batteries. line Input cells Pack BAT pushbutton. internal C. Battery HI and LO using (Make x IO3 ohms. using DN RANGE pushbutton. DMH (F). sure that 173 does not read off UP RANGE pushbutton. between HI IO megohms and LO using DMM (F). ?Zti%. “NOTE Battery pack may be discharged to the will not operate. If in doubt,recharge AB point the where battery the LO BAT indicator pack at least I6 circuit hours. 6-3 I MAINTENANCE INSTRUCTION Voltage d. 1. Accuracy Check. DC Voltage. =) Set to DC Volts b) Connect the C) Set DC Calibrator d) Verify that e) Repeat steps the and AUTO. DC Calibrator the (A) to the instrument c) and d) to the output reading with negative DC Voltage instrument. specified in Table is within the limits 6-3. specified. voltages. 6-3. TABLE Performance Check Reading Voltage Applied Relative Allowable Accuracy" +0.20000Vdc kO.l9997 to +0.20003Vdc ~0.19995to 3v +2.0000 Vdc k1.9997 t0 k2.0003 vdc ?1.9996 to i2.0064 Vdc 3ov +20.000 Vdc i19.997 to +20.003 Vdc 119.996 to t20.004 Vdc 3oov ~200.00 Vdc ~199.97 to t200.03 Vdc +199.96 to i200.04 Vdc 1ooov +lOOO.O Vdc 399.8 to ?1000.2 Vdc ?999.7 to t1000.3 Vdc Range 1 300mV :tDoes not include the DCCalibrator. 2. the uncertainty +*Does include DC Calibrator, of (at 25'C) Absolute the =) Set to AC Volts. b) Set to AUTO. cl Connect the AC Calibrator (8) d) Set the AC Calibrator to Hz, then repeat at 20 KHz. 6-4 Accuracy:'" *0.20005 uncertainty of vdc the AC Voltaqe. the to the output instrument specified input in Table 50 I MANUAL Digital Mulhmeler Models 172,173 4 Connect the f) Set High 9) Verify the High Voltage Voltage a displayed Amplifier Amplifier reading (C) as shown as shown in to the in Table instrument Table 6-4. 6-4. terminals. 6-4. input Set frequency terminals. to INSTRUCTION MANUAL MAINTENANCE Digltal MultImeter Models 172.173 AC Voltage Rangu I Voltage Applied i- 300 mv Check Allowable Reading (at 25°C) 0.20000 Vrms 0.19964 to 0.20036 Vrms 0.19959 to 0.20041 3V 2.0000 Vrms 1.9964 to 2.0036 Vrms 1.9960 to 2.0040 Vrms 3OV 20.000 Vrms 19.964 to 20.036 Vrms 19.960 to 20.040 Vrms 3oov 200.00 Vrms 199.64 to 200.36 Vrms 199.56 to 200.44 Vrms IOOOV 1000.00 Vrms 997.4 to 1002.6 Vrms to 1003.0 Vrms *Does not include DC Calibrator. e. Resistance I. High uncertainty of the (D) to **Does include Calibrator the uncertainty of to b) Set to HI. C) Set to d) Set to AUTO. e) Connect 2 WIRE. the Decade Resistor Resistor to the the instrument resistance TABLE 6-5. Performance input specified Check Allowable Accuracy" (HI Re< in terminals. Table 6-5. Verify OHMS) ng (at 25'C) Absolute Accuracy"" Resistance Setting Relative 2.00DOKn 1.9993 to 2.0007K 1.9991. to 2.0009KR 30Kn 20.000Ka 19.993 to 2D.OD7K 19.991 to i'O.Oo9KQ 3ODKn 200.00Kn 199.93 to 200.07K 199.91 to 200.09Kn 3Mo 2.0000Mn 1.9991 to 20.009K I.9989 to 2.0011~~ 20.000MR lg.969 to 2.003lK 19.967 to 20.033Mn 200.00MR 197.99 to 202.01K 197.79 to 202.2lMCl Range 3KQ *Does nqt Resistance DC Check. Resistance 3DOMn the ?(OHMS). Set the Decade readings given. 30MR Vrms Ohms. Set f) the Accuracy a) the cc TABLE 6-4. Performance I include the Source. uncertainty of the **Does include the uncertainty Resistance Source. of the 6-5 , INSTRUCTIONMANUAL Dlgllelhl”mmetcr MAINTENANCE Models172,173 IMPORTANT Measure the resistance the Model 172/173. of the leads and subtract from the resistance reading on Low Ohms. 2. =) Set to cl (OHMS,I b) Set to LO. c) set to 2 WIRE. d) Set to AUTO. e) Connect the Df !C ade f) Set the Decade the readings given. Resistor Resistor I/ (D) to Resistance Setting the the instrument resistance TABLE Performance Resistance Range to specified R source in Table terminals. 6-6. Verify 6-6. Check Allowable Accuracy" Relative and (LO OHMS) Reading (at 25.C) Absolute Accuracy"" 200.00 199.93 to 2DD.07Q 199.91 to 200.09 2.0000K~ I.9993 to 2.0007KQ I.9991 to z.ooogKn 30Kn 20.000KR lg.993 to 20.007KR lg.991 to 20.DO9Kn 300KR ZOO.OOKI! 199.91 to 200.09KQ lgg.89 to 200.llKD 3MT: 2.0000MR I.9979 to 2.002lMn 1.9977 to 2.0023M1, lg.899 to 20,lOlMS! 19.897 to 20.103Mfi 3oon 3KQ 20.000M!: 3OM:i *Does not Resistance include the Source. 1 uncertainty of ""Does include the uncertainty Resistance Source. the of the IMPORTANT Measure on the the resistance Model 172/173. of the leads and subtract from the resistance reading INSTRUCTION Dlgllal Models f. MANUAL MAINTENANCE Mulllmeter 172. 173 Current 1. Accuracy Check. (Model 173 DC Current. a) Set to DC Amperes., b) Set to AUTO. C) Connect Current Source (E) d) Set the Current readings given. Source to instrument current input specified Allowable Accuracy>? terminals. in (Model 6-7. Table Verify the 173 only) Reading (at 25'C) Absolute Relative ;tZOO.OOuA 199.78 to 200.22uA 199.77 to 200.23uA *2.0000mA I.9978 to 2.0022mA 1.9977 to 2.0023mA +-20,OOOmA 19.978 to 20.022mA 19.977 to 20.023mA 0.19978 to 0.20022A 1.9958 to 2.0042A +2.0000A "Does not include CurrentSource. I. the the Current Applied i-200.00mA Current to TABLE 6-7. Performance Check DC Current 9. only) the Accuracy uncertainty Check of (Model the 0.19858 1.9838 ""Does include the Current Source. Accuracy** to 0.20142A to 2.0162A uncertainty of the 172 only) DC Current a) Set to DC Amperes b) Set to AUTO. C) Connect Current Source (E) d) Set the Current Source to 200mA. d Set the Current Source to the to the IA. instrument Verify Verify input a reading a reading terminals. of of 199.48 0.9973 to to 200.52mA.e 1.0027A." *NOTE Readings Current cc do not account for Source (E) is used. source inaccuracy. Add 0.02% uncertainty if 6-7 MAINTENANCE INSTRUCTION MANUAL Digllal Multimeter Models Surrmary of TABLE 6-8. Adjustment Controls T Circuit Desig C203 C82l INPUT Current OHMS Zero lOOV @ 20kHz IV @ 20 kHz IKV @ 20 kHz IKV @ 20 kHz RI03 R201 Auto Zero c205 c817 ~819 ~820 R208 R209 I- Description Auto T Paragraph ADJ ADJ ADJ ADJ ADJ Cal R213 RZl7 0.3V Ref Xl0 Gain 2.9V Cal Buffer Zero R704 L R705 R707 R709 R803 R809 R816 R817 290KQ ADJ 1OMR ADJ R Bias '2.9Kn ADJ IV I&' IkHz ADJ lOmV @ IkHz ADJ 1OOV @ 1kHz ADJ lKV@lkHz ADJ R901 R904 R9ll IKV DC ADJ 300mV Zero 290V DC ADJ R913 3ov Zero R506 (173 only) R509 (173 only) R512 (173 only) IOmA DC ADJ IOOmA DC ADJ IA DC ADJ 172,173 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 c2 (el c2 (i) e7 e7 e7 .e7 cl cl (h) (i) fig d2 (d) d2 (d) cl (j) f24 f7 f9, tzg 13 e7 e7 27904F 27904F 27903E 27903E 27903E 27903E 27904F 27904F 27904F 27904F 27904F 27904F 27903E 27903E 27903E 27903E 27903E 27903E b-4 e7 d2 dl d2 dl Shown 27903E 27903E 6-4~~7 6-4 6-4 6-4 6-4 Schematic (d) (d) (d) (g) 27903E 27903E 27903E 27903E b-4 96 b-4 glo 274780 27478D 6-4 912 27478D -i AE INSTRUCTION MANUAL MAINTENANCE Dlgllal Mulllmeter Models 172,173 TOP COVER 27979c FRONT PANEL 27958A (173) 2802YA (172) SPACER 257628 COVER INSERT 26090A i 257290 HANDLE rlbunr AA ,3. lop and Bottom Cover Assembly. 6-9 MAINTENANCE INSTRUCTION MANUAL Dlgltal Mullimeler Models 172.173 ;;;;ECTS NOTE: DRESS WIRES BETWEEN SHELI AND POSTS BEFORE TOP COVER IS PLACED IN POSITION. TO- LINE FUSE F601 LINE VOLTAGE SWITCH 5601 MODEL I73 SHOWN WITH CURRENT BOARD INSTALLED. FIGURE 36. c-10 Location of Line Fuse and Line Switch. AB INSTRUCTION MANUAL MAINTENANCE Dlgilsl Mulllmelar Models 172.113 TABLE 6-9. List ITEM of Test Equipment Required DESCRIPTION MINIMUM DC Calibrator +0.290005v, For Adjustment/Calibration SPECIFICATION +290.005\1, NEEDED +2.90005v, +lOOO.O5V. +29.0005v, HFR HFR MODEL Fluke 343A HP 745A HP 746~ ESI RS725 TEK 465 to within 20 rw AC Calibrator High Voltage Decade IOmV, IV, IV, IOOV, Amplifier IOOV, IOOOV @ IkHz IOOOV @ 20kHz See B above 2KR through Resistor 20MR +O.Ol% Oscilloscope Current IA. Source+ DHM Test IOOmA, 1.0000v Circuit IOmA f 0.02% 1 0.001% Resistor, Capaci tar, 2MG IuF 1 Paralleled FLUKE 382~ KI 5900 KI KI .-253-2t1 -215-1uF “NOTE An alternate Current Source may be assembled using a precision Ii resistor and a Keithley Model 227 wiich has been stabilized at constant temperature, Use DMM (H) adjusted to obtain a 1.0000 V reading across the IR resistor. to accurately monitor the voltage drop. The following adjustments should be performed ADJUSTMENT/CALIBRATION PROCEDURE. 6-4. For checking the inwhen a specification has been determined to be out of tolerance. strument to its maximum published specifications, the Performance Verification procedure The “tolerance on reading” should be used. is adjusted to allow for time drift of critical components. Ambient temperature should be maintained at 25-C +I*C. Turn the instrument over so that the bottom cover is a. How to Open the Instrument. facing up. Loosen the four slotted screws in the bottom panel (the screws are captive Turn and will only unscrew until the screw head is flush with the top of the holes). and disconnect the wires going over the instrument. Carefully lift off the top cover, to the rear panel. CAUTION Disconnect the should be taken board when the disconnect the cc line to line line Care cord from the line voltage before opening the instrument. avoid contact with line voltages at various points on the pc voltage cord is connected. To discharge voltage on capacitors cord and depress LINE. 6-11 IV~H,N I LNANCE INSTRUCTION MANUAL Digital Mullimeler Models 172. 173 in b. Power Supply Check. Llt3E or BAT modes (if 1. Set the 2. Using The following measurements the Model 1728 is installed). internal Line Switch DMM ( H ) measure 5601 the can appropriately voltages be made using for listed in Table the line the voltage instrument being used. 6-10. 6-10. TABLE 5V to +5.25V +14.5 to +15.5 NOTE To achieve calibration to published specifications the instrument should be calibrated using the Model 1725 Calibration Cover. The instrument should be allowed to stabilize for approximately 1 hour after the Calibration Cover is put in place. It is important that the calibration sequence be followed exactly, because the adjustments are interrelated and dependent on prior calibration steps. c. A/D This that 1. Calibration. Capture Range a) Set the b) Set to c) Place d) Connect TPlOl and at 9) DMM to a short between input Oscilloscope (G) 2. Oscilloscope VERTICAL 3. Oscilloscope GND to the 1. Trigger: 2. Vertical 3. Time the HI and a Berg-type Z-pin housing TPl02 on PC-407 (See Figure Ext. For ensure MAN. Oscilloscope Set to Adjustments. I. f) calibration 300mV DC. Connect 4 NOTE precede the regular analog section will meet all rated specifications. procedure must the instrument TRIGGER Oscilloscope +, : to INPUT signal (Keithley 38). the to as ~~-266) following TPlOl with approx. 30 inch leads points. (FON). TPIOZ ground controls (Prefilter). test point ~1001~ (lo,.,). follows: DC coupled. DC, 0.5 Base: between LO. V/division 20 ms/division following h) Adjust potentimeter AUTO CAL time period. adjustments RI03 refer to trace (AUTO CAL ACAL) for shown a level in Figure 39. of +O.ZV +lV during AB INSTRUCTION MANUAL Digltal Mulllmeler Models 172,173 MAINTENANCE IMPORTANT When adjusting trimmer capacitors C203, C205, C817, C819, &20 and ~821 use an insulated screwdriver to avoid shorting to the metal shield. In addition the screwdriver should be rigid so that adjustments can be made with minimum backlash. ~803 ii R8og R9Oi . Ii c R8l6 ~817 ii .51. R91 I !I! h’ ._ I C8,7 ~819 R913 c82 I Model Model metal 173 is shown above (with 172 has a In, Low Resistor shield (Not shown). FIGURE AB 37. Location of C820 Current Board Installed.) (R514) mounted on the Calibration Adjustments. 6-13 hlAlNTENANCE INSTRUCTION MANUAL Digital Mullimeler Models 172. 173 Regulator VRb03 requires the use of heat sink assembly, Keithley part no. 28203~. If the regulator must be removed, bend the tabs on the heat sink to provide clearance. After a new regulator is installed, bend the heat sink tabs to their original condition to avoid a short circuit to the metal shield or other conducting surfaces adjacent to the reaulator. ,P603 t’601 P604 TPIOI red _ green wire TPIOi black J2Ol Pi01 P605 PYOI P606 P902 FIGURE 14 38. Locations of Connectors and Test Points. AA INSTRUCTION MANUAL = MAINTENANCE Dlgllal Multimeler Models 172,173 I AZi I , PREFILTER OUTPUT I SIGNAL I I ACAL ; I I A22 INTEGRATION I I I~/yI I I I I I_ FON j-----i ,I--120 i) j) ms- Adjust period.' potentiometer R20l (AUTO ZERO AZ,) for a level of Adjust Period. potentiometer R217 (AUTO for a level of are within AZ1 A22 ms~~*~200 k) Repeat steps I) Depress HI/LO m) Release 2 WIRE/4 ") Set range h,i, to and ohms j until (Set to WIRE (Set Adjust period. potentiometer 3. Repeat steps and to Current a) Set b) Place DMM to c) Record the reading d) Remove the short a short Adjust variable e) in step c) to within f) Remove 9) Set the the R208 I and Offset the levels +lV during ?O.ZV IV ?0.2V during simultaneously. 2 WIRE). 3K ii. (A:AL) Zero all ?0,2V LO). I. Adjust potentiometer R707 AZ1 and AUTO ZERO A22 periods. 2. ZERO AZ2) +lV 2 until ($2 BIAS) (0.3V both for Ref) a level fora conditions of level are of met +IV +IV +O.ZV during 10.2V AUTO ZERO during AUTO CAL HI LO. simultaneously. Adjustments. 300 mV DC range. across INPUT HI and on and the Test Circuit DMM to 2-WIRE DMM. connect capacitor + 2 digits. the C203 and and LO. Test (Input replace Circuit Current) the (H) across to obtain input the and same reading as short. LO ohms. 6-15 MAINTENANCE INSTRUCTION MANUAL Digital Multimeter Modelo172.173 h) Set range i) Adjust j) Set k) Adjust the Zero capacitor DMM to that than C205 (OHMS zero) for a zero reading the on DMM. 300mV DC. potentiwneter DC Voltage 1. 3 KQ., variable 1) Verify has no more d. to RYO4 (300 during the 10 transitions Calibration. mV Zero) for a zero 200 ms INTEGRATION period from positive slope to (Depress DC, release V/A, reading on the the output at negative slope depress DMM. TP102 (and (Prefilter) vice-versa). AUTO/MAN.) Adjustments. a) Connect the b) Set instrument the DC Calibrator to on the the input terminals. 300 mV range by using DOWN RANGE. NOTE It may be necessary to compensate for dc offset of the DC Calibrator. if the dc offset is -2 uV dc then the DC Calibrator should be adjusted compensate for the offset. Use a Keithley Model 155. Set C) d) “+I”. the DC Calibrator Adjust the “300 Set the instrument f) Set the DC Calibrator g) Adjust 2. Full Range “30 output mV ZERO” (RV04) e) the for’an on the for V ZERO” of f or +5 PV (see a display note which For example, +2 uV to above). flashes between “-0” and 30 V range. an output (R913) of for +.5 mV. a display which flashes between “-0” and “+I”. Calibration. a) Connect the b) Set the instrument C) Set the DC Calibrator d) Adjust the DC Calibrator to control to the to given the range the in input termillals. given in output Table given 6-11to Table in 6-11 Table achieve 6-11 the display specified. NOTE Perform the calibration Full rnge *The Setting Applied in I exact order given. TABLE 6-11 Range DC Calibration input Control Display Required”* 3 v +2.90005 v 2.9 V ADJ (R213) +2.9000 to +2.9001 v 300 v +290.005 v 290 V ADJ (R911) +290.00 to +290.01 v 30 v +2g.o005 v X10 GAIN (R209) +29.000 to +29.001 v 1200 v +Tooo.o5 v 1 KV ADJ (RYOI) +1000.0 to +1000.1 v DC Calibrator output should be adjusted ;+-L Display 6-‘6 the to compensate should flash for dc offset alternately voltage. between readings. cc INSTRUCTION MANUAL MAINTENANCE Dlgllal Multlmeler Modela 172.173 e. AC Voltage Calibration. 1. Depress AC. 2. Release V/A. 3. Depress AUTO/MAN. 4. Connect the 5. Set the instrument 6. Set the AC Calibrator 7. Adjust the AC Calibrator to Control to the the range for the given in input given voltage Table 6-12 terminals. in Table and to 6-12. frequency achieve given the in display Table 6-12. specified. TABLE 6- 12. Lange Setting zii 300 mv Applied Input Frequency Control Display Required 010.00 mv I KHz 1 KHz ADJ (R8og) 009.99 to 010.01 mv v 1.0000 v I KHz I KHZ ADJ (~803) 0.9999 to 1.0001 V 300 v 100.00 v 1 KHZ 1 KHz ADJ (R816) 099.99 to 100.01 v 1000 v 1000.0 v 1 KH.; 1 KHZ ADJ (11817) 999.9 to 1000.1 v ,ooo ” 1000.0 v 20 KHz 20 KHz ADJ (C820, 999.9 to 1000.1 v 3 v 1.0000 v 20 KHz 20 KHz ADJ (C819) 0.9999 to 1.0001 v ?;A 300 v 100.00 v 20 KHz 20 KHz ADJ (C817) 99.99 to 100.01 v * ;t;t 3 ;L;>t C821) The “green” wire 14. Connect the Oscilloscope to the test points shown in Figure 38. The “black” wire should be connected between power supply low and Oscilloscope low. The should be connected between pre-filter output and Oscilloscope vertical input. “red” wire should be connected between FON and the Oscilloscope trigger. AB 6-17 INSTRUCTION 1 f I\INTENANCE MANUAL Digital Mullimeler Models 15. Set the Oscilloscope 16. Set the instrument 17. Depress HI/LO 18. Connect a short 13. AdjustO.PVREF 20. until Verify that level is +lV kO.PV all conditions are satisfied. 21. Set 22. to lV/div. Ohms and release across for +lV to Connect the Resistor 23. Set Decade 24. Adjust 25. Set 26. Depress 2 WIRE/4 27. Connect the 28. Set Decade 29. Adjust the the the the the Current Depress V/A. 3. Depress AUTO/MAN. 4. Set Model 5. Connect 6. Adjust 7. Set 8. Connect 9. Set II. Set 12. Adjust Current which 173 to Current to 173 to the Current the Current Zero. the upper a reading Repeat steps e.2 through e.20 set of terminals. of 230.00 fl diqit. HIR. between-the for terminals and Decade Resistor of 2.3OOOKn il digit. 173 only). 3 ampere Source (G) the input a reading the range. to for the Model a reading 173. of 1.0000 A. 300 mA range. Sourceto Sourcefor the (A) for Sourcefor 10 mA ADJ (R506) Calibration determines Auto Cal. (HIQ) to for (R709) 100 mA ADJ (R509) the Current Auto 2.9000KR. I A ADJ (R512) Model during cable (Model 2. Adjust test ADJ DC. IO. h. Z.PKn Depress the WlRC. during 3KQ range, Resistor I. the 20 ms/cm. WIRE. 4-WIRE the of 290.000Kfi. (R704) to Calibration the base LO. tO.lV (0) to ADJ instrument and 3OOKn range. Resistor 290Kn and a time 2 WIRE/4 INPUT HI (R208) Decade sensitivity 3Kf1 range. instrument 9. I the to 172, for 173. lOO.00 a reading 10.00 for Model mA. of 100.00 mA. mA. a reading of 10.000 No adjustments For Model 172. accuracy is resistor R514 (In, mA. can 0.1X, Primary be made. IOU. Ww). component 173 2 INSTRUCTION MANUAL Dlgllel Mulllmeler Models MAINTENANCE 172,173 6-5. TROUBLESHOOTING AND REPAIR. An understanding of basic analog and digital circuit fundamentals is needed to troubleshoot and repair the Model 172/173. It i5 strongly recommended that the user review the Theory of Operation (Section 5) and the Adjustment/ Calibration procedure (paragraph 6-4) before any attempt is made to repair the Model 172/173. a. Troubleshooting Hints. 6-13 describes the Symptoms and Probable Faulty Table Component for a variety of possible malfunctions. It is beyond the scope of this Instruction Manual to list all possible symptoms. Therefore, the Keithley represenative in your area should be contacted in the event repair is needed. For In-Warranty repairs within the continental U.S.A. contact the factory for shipping instructions. SYMPTOM a) No display (LINE mode) TABLE 6-13 Troubleshooting PROBABLE CAUSE No display. (BAT mode) Line switch incorrectly. 2) Fuse FlOl is missing or open. Line voltage connector J601 improperly connected to pc board at ~601. Batteries need recharging. (Check for LO BAT indication.) Battery fuses blown. Batteries improperly installed on battery pack. Battery cables improperly installed. Display cable P3Ol not properly connected. 4) 2) 3) 4. c) d) AA No display (Al I modes) Display is blank. or some segment on. CORRECTIVE I) 3) b) Hints 1) set 2) LSI module installed. improperly 3) Power supply 1) Clock ing. waveform malfunction is miss- ACTION Check connection to line power. Check LINE switch setting to conform to line voltage 36. available. See Figure Check fuse. Reptace with proper rating. Check connection to DC board as shown in Figure 39, Connect power. instrument to Release LINE. I ine Check F401, F402, and F 403. Check battery pack for proper polarity on all batteries, See Figure 7 . Check battery connections at ~602 and R606. as in Figure 7. Check plug P3Ol and mating Make certain connector J2Ol. al 1 pins are making proper contact (pins should not be bent). Check for proper orientation of the connector Check UlO3 for proper installMake certain all pins ation. are making contact (pins should not be bent). Check power supply voltages as described in Section 6-4b. Check pin 4 of LSI (UlO3) for a clock waveform of approx. between +4V 334 kHz, swinging If waveform is present and 0V. LSI U103 is probably faulty. If waveform is not present, integrated circuits UOO3, UO04. transistor QO03, or ceramic resonator CR003 may be faulty. 6-19 ,lAlNTENANCE INSTRUCTION MANUAL Digital Multimeter Models 172. $73 JIOOI FIGURE 40. 6-20 Plug-In Connections on PC-407 CB INSTRUCTION MiNUAL MAINTENANCE DIgItsI Multimeter Models 172,173 TABLE 6-13 Troubleshooting SYMPTOM e) f) One display bar missing on all digits. One digit f PROBABLE CAUSE CORRECTIVE 1) Check plus P3Ol and matins connecior-J201. t4ake cergain all pins are making contact. “a” bar: Check R3O2 pin 14 for signal. When "ON", voltage should be approx. +l.8~. "b" bar: Check R3O2 pin 16 "c" bar: Check R3O2 pin ,l5 "d" bar: Check R3O2 pin 9 'e" bar: Check R302 pin I2 "f" bar: Check R302 pin 10 "g" bar: Check R302 pin 13 decimal point: Check R302 pin II Check plug P3Ol and mating connector JZOI. If units digit missing, check collector of Q305 for signal. When "ON" voltage should be approx. 418~. If tens digit missing, check collector of 4304. If hundreds digit missing, check collector Q303. If thousands digit, minus sign and function indicator missing, check collector Q302. On 10,000 digit, check collector Q301. If no signals are present problem could be transistor or integrated circuit u301. 2) I) missing. 2) Faulty connection between P3Ol and JZOI. Cathode driver cirsee cuitry faulty. schematic 27404D Faulty connection between R30l and J2Ol. Anode driver circuitry faulty. See schematic 27404D. 9) 10,000 digit missing. (except if reading is less than 10,000 counts) Q301 h) Function off. Faulty function. Transistor i) indicator reading on R 1) 2) j) AA Faulty Current reading function. on (Con’t) Hinl ts Q306 DMM set for 4 WIRE ohms and R SOURCE terminals are not connected. DMM set for 4 WIRE ohms, but leads are reversed. Current fuse is blown. f ACTION F5Ol Set to 2 WIRE. Connect HI input to the same side of unknown as the + R SOURCE lead. Replace fuse on rear panel. 6-21 INSTRUCTION MANUAL Digilal Multimeter Models 172,173 b. How to Repair Circuits and/or Components Which Have a “Conformal Coat”. The 172/173 circuit board has a conformal coat which protects the circuit from moisture, lables the 172/173 to function over a range of environmental conditions. The circuits and/or components are covered I. Dow Corning@ QR4-3117 Dow Corning Corporation. one-part silicone elastoplastic resin. 2. Parts coated with QR4-3117 coating can by either a) Apply a small amount of solvent (see below) and allow make the repair (unsolder component, etc.). After cleaning, Coating. Cleaning may be accomplished using a small 3. as FREON-TE, TOLUENE, XYLENE OR CHLOROTHENE. and by a Conformal Coating manufactured Conformal Coating is a transparent, be repaired b) For minor repairs, a soldering iron can After unsolder or resolder a component lead. with Conformal Coating. Model be used cleaning brush of two the coating Recoat with methods. to dissolve. Conformal to melt through the the soldered area, or cotton swab and by coating recoat to solvent, such CAUTION Use solvent 4. 5. coating Recoat on circuit with Shelf life material undiluted tape-side only. Conformal Solvent Coating may adversely using a small of the coating material is approximately in order to maintain the properties of affect brush or I2 months. the material. components. other Always applicator. use fresh WARNI NG Keep away from heat and open flame. The Conformal Coating is combustible. Avoid prolonged breathing of vapor. Avoid prolonged adequate ventilation. Take necessary precautions when using cleaning solvents. ed skin contact. cable manufacturers data sheets. I --22 Use with or repeatSee appli- AA INSTRUCTION REPLACEABLE MANUAL PA&S Digital MultImeter Models 172, 173 I SECTION 7-l. parts GENERAL. This section contains list is arranged in alphabetical 7. REPLACEABLE information order of PARTS for their ordering Circuit replacement Designations. ORDERING INFORMATION. To place an order or to obtain information 7-2. contact your Keithley representative or the factory. replacement parts, front cover of the catalog for addresses. When ordering, include the mat ion. a. Instrument Model b. Instrument Serial t. Part d. Circuit e. Keithley 7-3. Number Designation Part (if applicable) Number SCHEMATICS. her supply d. Circuit designation Battery Pack.) This schematic Sheet 3). (28656E, series This circuitry. describes This schematic designation AB schematic describes ohms source. Circuit describes the designation display Battery Pack(26758C). Digital Interface, Upper (28019E). Circuit designation series is This 1100. Timing (28247E, for Model 1722. schematic driver the analog-toseries is circuitry. 000, Circuit describes the line power supply. the Model 1728 Rechargeable 26758~ for describes series is This Digital Interface, Bottom (27902E). 9. Circuit designation series is 1000. cui try. I This and schematic Circuit the Sheet 3 of 3). This is 600. (See schematic 1728 Rechargeable Diagrams I of 3). attenuating, 300. e. Current Board (27478D). Circuit the Models I72 and 173. Model (28656E, filtering, and 900. (28656E, Sheet 2 of and the range selection c. Display (274040). designation series is i. concerning See the inside following infor- Description b. A/D Converter digital converter 100, and 200. h. cuitry. The Number a. Input Signal Conditioning. input switching, ac/dc conversion, designation series is 700, 800, f. parts. the 500. Circuit schematic schematic 28248E, current circuitry designation describes describes 28249D) series the the . for Model Model both is 400. 1722 cir- 1722 cir- ( REPLACEABLE PARTS INSTRUCTION Cross-Reference MFR. ICODE 1 ,A-B I ;A-D AMP APH APX BEC BLD BRG BRN BUS C-l c-w CAD CAN CLB - TABLE 7-1 of Manufacturers NAME AND ADDRESS FEDERAL jUPPLY ZODE Allen-Bradley Milwaukee, II 121 WI T Corp. 53204 Analog Devices Cambridge, MA Amp Inc. Harrisburg, IL, AlllperC% Elkgrove Vlg, Beckman Fullerton, CTS 24355 I7105 Inst. CA Mfg. IL DO779 60153 IL 60007 Inc. 9'2634 EFJ 70903 ERI 22526 F- I 92507 30294 Bussman Mfg. Div. St. Louis, MO 63017 71400 Components, Biddeford, Continental-Wirt Warminster, CA Inc. ME 04005 PA Elec. 18974 G-E 36751 Corp. G-I 79727 GLD Caddock Riverside, CA ITT Cannon Santa Ana, Electric CA 92702 Centralab Milwaukee, FUS 92507 Division WI 53201 I9647 H-P DLE 71590 -- -.+- Inc. 12697 46514 71450 Dickson Electronics Corp. Scottsdale, A2 85252 Electra Cube San Gabriel, EDI Inc. CTS Corporation Elkhart, IN ECI 73138 Inc. PA 17070 Clarostat Mfg. Co.. Dover, NH 03820 Dielettron New York 73445 FEDERA SUPPLY CODE NAME AND ADDRESS DTN 02660 Co. 60644 Berg Electronics New Cumberland, Bourns, Riverside, MFR. CODE C DIC PA Amphenol Broadview, Belden Chicago, 1 CLR Inc. 02142 MANUAL Electronic Yonkers, (Consolidated) City, NY IO013 NY Inc. CA VI776 Devices 10710 E F Johnson Waseca, MN Erie Erie, 14752 Inc. Co. 56093 Technological PA 16512 Fairchild Yountain 12954 74970 Prod. 72982 lnst Corp. VieW,CA 94043 07263 Bussman Mfg. (Fusetron) St. Louis, MO 63107 71400 General Syracuse, Electric NY 03508 General Newark, Instrument NJ 07104 Gould, Inc. St. Paul, MN Hewlett-Packard Palo Alto, CA Dale Electronics Columbys, NE Company 13201 Corp. 55165 726% 52431 94304 50434 Inc. 68601 91637 . INSTRUCTION Dlgllal MANUAL AEPLACEbLE PARTS Mulllmeler Model8 172. 173 TABLE MFR. CODE INT I RC <- I .-F $OL 10T IAT '68 'AK 'OM UN IAY {CA AB 7-l NAME AND ADDRESS FEDERAL SUPPLY CODE lntersil Cupertino, 32293 Inc. CA IRC Division Burlington, Keithley Cleveland, MFR. CODE RCL 95014 SIE IA 52601 07716 Instruments, Inc. Ohio 44139 Littlefuse, Des Plaines, Holex Downers (Cont'd) Inc. IL SIG 80164 SIL 60016 75915 SPG Grove, Motorola Phoenix, IL 60515 Semi Prod. AZ 85008 27264 Inc. National Semi Corp. Santa Clara, CA 95051 T-l 04713 TEP 27014 Potter & Brumfield Princeton, IN 47670 TPL Paktron Vienna, TRW VA 22180 Pomona Electric Pomona, CA 91766 Q-Tron Santa Ana, Raytheon Quincy, VIS 05276 VRN CA 92705 WAB Company MA RCA Corporation tloorestown, NJ 94144 08050 FEDERAL SUPPLY CODE NAME AND ADDRESS RCL Electronics, Manchester, NH Siemens Iselin, Inc. 03102 Corporation NJ 08830 Signetics Sunnyvale, Sprague Visalia, Texas Dallas, CA TRW Capacitor Ogallala, NB Vishay Malvern, Vernitron Laconia, 95054 Instruments, TX 75231 Corp. 14606 92080 Div. 69153 03246 Wabash-Magnetics Wabash, IN 46992 17856 14659 Inc. Resistor Products PA 19355 NH 25088 18324 Electric Co. CA 93278 Tepro Electric Rochester, NY Temple Tecate, j Corp. CA 94086 Siliconix Inc. Santa Clara, CA 01686 01295 02985 29505 844 II 18612 13150 01101 02734 7-3 IEPLACEABLE PARTS INSTRUCTION MANUAL Digital M”ltime‘er Models 172.173 BATTERIES "400" rircuit esig. Description BT40l -T402 T403 lP.ZV, Multicell. Multicell~ lP.ZV, set of Seven "C" :i SERIES Nickel-Cadmium NickE !I -Cadmium cells, 8.4 volts (ET) (Schematic Mfr. Code Mfr. Desig. Keithley Part No. GLD GLD 403041 403041 BA-31 BA-jl -- -- Nickel-Cadmium, "C" ccl I , 1.2 volts (used for BT403; seven required) . . . . . . . . . . GLD CAPACITORS irccit esig. "000" COOI 002 003 coo4 -005 006 coo7 ~008 009 LO10 0.1 IIF, l6V, 0.1 "F, 16V, 0.1 PF, 16v, 0.1 PF, 16V, 0.1 uF, 16V, 33pF, IOOOV, O.oluF, 16v, 0.01 uF, 16v, 2.2 uF, 2OV, 0.47pF, SW, CerD. ........ CerD. ........ CerD. ........ CerD. ........ CerD. ........ Cero ........ CerD. ........ CerD ........ ETT ......... Cer Film "100" Cl01 102 -103 Cl04 105 106 Cl07 '108 109 Cl10 Clll :I I2 cll3 Cl14 :\I5 7-4 SERIES 0.1 "F, l6v, CerD. 0.1 ,,F, 16~. CerD. 0.1 pF, 16v, CerD. 0.1 uF, 16v, CerD. 0.1 uF, I~v, CerD. 0.022 pF, 5OV, MPC .0022 ,,F, ZOOV, My, 0.01 pF, loov, My! 33 pF, IOOOV, CerD 0.1 uF, 16v, CerD. 0.1 "F, l6v, CerD. 0.22 PF, 5OV, MPC. 0.22 uF, 5OV, MPC. 0.22 "F, 5OV, MPC. 8.2 pF. 50~. Ce,- ........ ........ ........ ........ ........ ........ 10% ...... lo% ...... ........ ........ ........ ........ ........ ........ ........ (Schematic CLB CLB CLB CLB CLB CLB CLB CLB C-l ERI SERIES (Schematic CLB CLB CLB CLB CLB ECI E-C PAK CLB CLB CLB ECI ECI ECI CLB :’ 2.OSCB BA-30 Mfr. Desig. Keithley Part Nc. (C) Mfr. Code Description' 26758C) 28656E) ~~16-104 ~~16-104 ~~16-104 ~~16-104 U~l6-104 DD-330 UKl6-103 UKl6-103 TDl-20-225-20 813l050651474~ C-238-.lh C-238-.IM C-238-.lM C-238-.IM C-238-.ln C-64-33~ c-238-.01" C-238-.OIM C-179-2.2" C-237-0.47t' 28656E) ~~16-104 ~~16-104 ~~16-104 U~l6-104 uKl6-lo4 625BlA223-J 6258l~222 PT420 DD-330 ~~16-104 ~~16-104 625BlA224J 625BlA224J 625BlA224J C40c8R2~ C-238-.IH C-238-.ltl C-238-.IH C-238-.ltI C-238-.IH C-ZOI-.022M C-ZZI-.0022M C-38-.OlM C-64-33P C-238-.ln C-238-.ln C-20l-.22H C-ZOI-.22M c-ZOI-.22t4 C-282-8.2~ AB i INSTRUCTION Digital Models MANUAL REPLACEABLE 172.173 CAPACITORS Circuit Desig. 15 pF, IOOOV, CerD . 2.2 uF, 2OV, ETT . . .8-11 pF, IOOOV. HI-K, 3.3pF, 50~. Cer . . .8-11 pF. IOOOV, HI-K, O.O022pF, 2OOV, MPC. 100 pF, IOOOV, CerD. 100 pF, IOOOV, CerD. 100 pF, IOOOV, CerD. 1500 pF, IPOOV, CerD. , . . . . . . . SERIES . . . . Glass . * Glass . . . . . . . . . "300'a C3Ol C302 180~F, O.OluF, 20%. 6v . . . . . '16v, CerD. . . . "500" C5Ol 47 pF, IOOOV, CerD . . "600" ~601 ~602 ~603 ~604 ~605 C606 C607 C608 ~609 ~610 ~611 ~612 BA 100 pF, IOOOV, 1500 pF, 5OOV, CerD. Poly. (Schematic . . . . . . * . . . . . . . . . . . . . . . . . . . . SERI'ES . . . . . . CLB C-l SPG CLB SPG E-C CLB CLB CLB CLB (Schematic SERIES . . . . . . . . . . . . . . . DIG . . CLB (Schematic . . . CLB SERIES (Schematic C-l C-l C-l C-l RIC C-l TPL C-l C-l EDI TPL EDI 270 uF, 6v, ETT. ......... IO uF, 2OV, ETT. ......... IO uF, ZOV, ETT. ......... IO uF, 2OV, ETT. ......... 2000 uF, 25V ........... 0.47 IIF, 2OV, ETT. ........ 470 uF, 5Ov, EAL ......... IO pF, 2OV, ETT. ......... IO pF, 2OV, ETT. ......... O.iuF, 5OV, CerF ........ 470 uF, 5OV, EAL. ........ O.luF, 5OV, CerF. ........ "700" C7Ol C702 (C) Mfr. Code Description "200" c201 c202 C203 C204 C205 C206 C207 C208 c209 c210 PARTS MultImeter SERIES (Schematic . . . . . . . CLB . . . . . . . CLB Mfr. Desig. Keithley Part No. 28656E) DD-150 TDl-20-225-20 GHCIIOOO c40C3R3D GHCIIOOO 625BlC222 DD-IOI DD-IO1 DD-IOI DD-152 C-64-l5P C-l79-2.2H C-202-.8-llP C-282-3.3P C-202-.8-IIP C-22l-.0022H C-64-100P C-64-100~ C-64-100~ C-64-l500P 27404D) Dl80EC6M UKl6-I03 I c-270-l80M C-238-.OlM 2747GD) DD-470 ~-64-47~ 28067D) TD5-506277-20 TD2-20-106-20 TD2-20-106-20 TD2-20-106-20 JC-~-2000-25-8~ TDI-20-474-20 411-47OpF TD2-20-106-20 TD2-20-106-20 8l210506l-104~ 411-47OuF 812105061-104~ C-194-270ti c-l79-IOM C-179-IOM C-179-IOM C-255.2000M c-17g-.47M C-246~470l4 c-17g-lon C-179-IOM C-237-O.ln C-246-470~ C-237-O.lH 28656~) DD-IOI CPR-l500J 7-5 1 REPLACEABLEPARTS INSTRUCTION MANUAL DigItal Mullimeter Models 172.173 INTEGRATED Circuit Desig. Ul105 ut 106 u1107 Ul108 u1109 ulllo Ullll (U) Mfr. Code Description "1100" UllOl UllO2 u1103 UllO4 CIRCUITS SERIES (Schematic Hex Inverters, Open Collector Output.. Hex Inverters, Open Collector Output.. Hex Inverters, Open Collector Output.. Positive-NAND Gates and Inverters/ Totem-pole outputs , . . . . , . . Hex Inverters, Open Collector Output Dual D-Type Flip-Flop, 14-pin DIP. Quad 2-Input NOR, 14-pin DIP . . : COS/HOS a-Stage Static Shift Register . . . . . . . . . . . . . Quad 2-Input AND, 14-pin DIP . . , . COShIOS Dual 4 Input NAND Gates. . . Six COS/MOS Hex lnvertec . . . . . . . . TEXAS . . TEXAS . . TEXAS . . . . : . . . . , VRlOl VR102 Zener, Zener, 9.1V, 6.2V, 400mW . . 1/4W. . . SERIES . . . . Zener, Zener, Zener, 6.2'~. I/~w - Part of gV - Part of matched 12V, 400mV . . . "600" VR601 VR602 'JR603 Voltage Regulator, Regulator, --7c Zener, matched set set 280406 . . SERIES 12V, 400mW . . . SERIES . . . . . c-137 c- 14.1 c-103 c-108 CO402lAE CD4081BE CD4012AE CD4069BE c-130 c-138 c-140 c-139 MFR. Desig. Keithley Part No. lN96OB I N827A DZ-55 DZ-48 lN963B DZ-54 LM340LA2-8.0 UGH7805393 RC4195TK IC-164 28515A IC-128 lN963B DZ-54 28656E) DIC 28656E) . . NAT . . F-l . . RAY (Schematic . . SN74LSl4N SN74LSOSN CD4013AE CD400lAE 280408 (Schematic . . c-141 c-141 c-141 28656E) (Schematic Regulator, +Bv, Case TO-92 . . (IC-93). . . 5v, Case TO-220 ?15V, TO-66 Case . . . . . . "800" VR801 (Schematic , , , . . , . . DIC . . . . . . . . DIC SERIES SN74LSOSN SN74LSOSN SN74LSO5N (VR) Mfr. Code "200" VRZOI VR202 VR203 TEXAS TEXAS RCA RCA . . . RCA . . . RCA . . , RCA . , . RCA Description "100" Keithley Part No. 28019E) VOLTAGE REGULATORS Circuit Desig. Mfr. Desig. . 28656E) . DIC INSTRUCTION REPLACEABLEPARTS MANUAL Dlgltal Multlmeler Models 172,173 JUMPERS (W) Circuit Desig. Mfr. Code Description "200" SERIES "500" SERIES "600" SERIES w601 --_ (Schematic SERIES J-3 (SCHEMATIC 28656~) J-3 (SCHEMATIC 28656~) K-l ~801 "900" (Used only on Model 173) SERIES -- (Schematic K-l J-3 28656E) K-l "800'~ Keithley Part No. 28656E) K-l w501 AB (Schematic K-1 w201 w901 Mfr. Desig. J-3 28656E) -- WIRE 7-27 REPLACEABLEPARTS’ INSTRUCTIONMANUAL Digital Mullimelcr Models 172. 173 MISCELLANEOUS I KE ITHLEY PART NO. DESCRIPTION Top Cover (less metalcal) : : Metalcal for Bottom (less . . . Cover Metalcal, . . Insert (4 Rubber foot Front Front “p” instructions MC-239 panel MC-2j5 25729D req’d) 26090A req’d) Panel Panel Ring 25727E insert) (2 Spacer MC-236 metalcals) rear (less cover operating . Metalcal, Handle top 27979c (4 257628 req’d) - Model - Model (Used to FE-IO 172 28029A . 173 hold display board) 279 58A ~A-18 J INSTRUCTION MANUAL REPLACEABLE PARTS Dlgltal Multlmeter Models 172.173 TABLE 7-2 COMPONENT DESIGNATIONS (See FOR PC-407 Figure (MODEL 173) 43.) I Circuit Desig. AB COOI coo2 COO3 coo4 coo5 Co06 coo7 co08 coo9 G-27 ~-27 K-26 M-26 M-25 s-29 u-29 T-26 U-27 Cl01 Cl02 Cl03 Cl04 Cl05 cl06 Cl07 cl08 Cl09 Cl10 Cl11 Cl12 Cl13 Cl)4 Cl15 G-26 H-22 F-18 G-18 H-18 K-23 'K-22 L-21 K-19 M-24 P-26 Q-22 Q-22 Q-20 T-20 C2Ol c202 czo3 C204 c205 ~206 C207 ~208 c209 c210 Y- 19 a-23 a-20 a-21 a-18 a-17 c-18 d-17 e-21 f-24 ~601 C602 C603 c604 c605 C606 C607 C608 C609 II610 B-28 B-26 D-25 L-15 F-13 J-13 J-11 L-IO L-IO ~-8 - - Location Code Circuit Desig. I ---~- -~ ~611 ~612 C7Ol C702 J-2 I-14 T-14 z-15 ~801 ~802 ~803 ~804 ~805 C806 C807 C808 CEO9 ~810 ~811 C812 c813 ~814 C815 C816 C817 C818 c819 C820 ~821 P-10 N-8 Q-9 R-Y N-7 N-5 R-8 R-5 S-5 P-2 u-7 v-8 v-7 T-3 X-IO x-5 Y-5 x-3 Z-6 f-5 f-4 CR207 ~~208 CR209 CR210 CR211 CR212 CR213 C~214 cgo1 cgo2 c903 cyo4 c905 cgo6 c907 cgo8 C909 (NS) C910 (NS) V-II D-19 f-14 g-14 g-12 g-7 h-6 g-3 k-26 h-24 CR00 1 CR002 CR003 CR201 CR202 CR203 CR204 CR205 cR206 J-26 L-26 w-30 u-19 v-17 v-19 v-18 w-21 Y-17 I I I Location Code Y-23 b-23 c-23 c-23 d-23 d-23 H-33 w- 18 CR601 ~~602 J-8 J-5 CR701 CR702 CR703 CR704 CR705 P-14 P-13 s-13 Y-13 e-16 CR801 ~~802 CR803 ~~804 Q-5 v-5 a-2 b-2 CR301 CR902 CR903 CRY04 CR905 ~ ~ (NS)! (NS)' w-9 g-9 h-19 m-23 m-24 DS601 p-30 FbOl c-16 J2Ol b-30 K801 u-6 Kg01 PI01 ~601 P602 P603 ~604 P605 P606 K-9 e-25 H-31 B-16 K-7 K-4 g-31 k-31 P9Ol P902 k-l p-1 - I 7-29 EPLACEABLE PARTS INSTRUCTION MANUAL Digilal Mullimeler Models 172. 173 TABLE 7-2 (continued) Component Designations For r :ircuit lesig. 200 1 2002 2003 r Location Code Circuit Oesig. H-25 R-25 v-29 Q801 Q802 Q8o3 P-9 N-6 P-4 F-19 H-21 J-22 J-21 ~-24 L-23 L-21 M-22 M-21 $2 b-3 Q901 Q902 QV03 V-IO ROOI S-23 s-22 s-21 s-20 R004 H-27 J-27 Q-27 ~-27 PC-407 rI I Location Code Iircuit Iesig. ___- t= f1209 I(210 f?211 1\212 f\213 I\214 F\215 Ft216 f<217 ft218 f\219 1(220 Q-V p201 p202 Q203 ~204 Q2O5 ~206 Q207 L-20 s-18 s-17 T-18 T-17 x-19 x-17 Y-19 b-22 b-20 d-21 d-20 d-19 f-22 f-21 h-22 ~208 Q209 Q210 4211 Q212 :;1: Q215 Q216 R002 R003 R005 R006 R007 R008 ROOV ROIO Roll R012 R013 S-26 s-30 RIOI RI02 RI03 R104 RI05 RlO6 RI07 R108 RlOV RI10 Rlll H-27 F-25 F-23 F-21 F-18 H-20 G-19 H-18 H-17 T-23 RI12 Q701 4702 4703 Q704 Q705 Q706 Q707 Q7O8 p-16 P-15 Q709 4710 a-14 ~205 b-15 R206 R207 R113 RI14 :I;; i e-9 f-10 P-12 R201 Q-12 x-14 2-14 R202 R203 ~204 R208 fI221 ft222 f3223 f3224 f7225 f%226 f1227 (NS) ft228 fI229 II230 II231 T-30 s-29 u-30 v-29 x-30 Y-29 T-27 I%60l I7602 I~603 Ix604 1605 1606 1607 R608 ?609 R610(NS) ~611 ~612 R613 R701 R702 R703 R704 R705 ~706 R707 R708 R709 R710 X-26 X-27 2-26 2-27 K-17 L-19 ~-18 M-18 M-18 N-18 p-18 P-IV - I Location Code R-19 Q-18 U-24 u-21 u-23 u-18 W-24 v-21 v-20 w-18 Y-21 x-18 2-23 2-18 b-24 b-22 b-18 d-18 d-20 e-17 g-24 g-22 e-28 B-30 B-31 c-30 D-31 E-30 D-27 L-4 L-4 M-4 k-28 p-26 H-IO M-V N-15 P-13 R-13 u-16 v-16 u-15 u-13 V-15 w-14 v-16 __-AB INSTRUCTION MANUAL REPLACEABLEPARTS Dlgltsl Multlmelar Models 172.173 TABLE 7-2 (continued) Component Designations For PC-407 r- Circuit Desia. Location Code Circuit Desig. Location Code Circuit Desig. / Location Code j ' 3 R801 R802 R803 R804 ~805 R806 R807 R808 R809 R810 R811 R812 R813 R814 R8\5 R816 R817 R818 R819 R820 RYOI R902 R903 R904 R905 RY06 R907 R908 609 RYIO RYII R912 R913 RYl4 R915 RY16 R917 RY18 RYl9 R920 R921 R922 R923 RY24 R925 ~926 - AB N-IO P-9 R927 (NS) R928 (NS) R929 (NS) k-17 W603 w604 R931 265 p-20 p-20 W605 W606 w607 5601 B-20 W801 T601 TPlOl TP102 D-7 n-23 U-24 WY01 UOOI uoo2 uoo3 uoo4 uoo5 ~-28 N-27 Q-29 U-28 U-26 UlOl UlO2 u103 H-20 P-24 a-26 u201 u202 W-23 x-20 u701 ~702 s-15 b-13 U9Ol VROOI VRlOl VRl0.7 d-14 x-29 F-26 G-21 VR201 VR202 VR203 L-19 N-18 2-23 VR601 ~~602 VR603 B-25 F-16 L-13 VREOI Y-9 g-5 w201 P-18 e-18 f-19 f-18 ~601 ,W602 D-29 D-29 S-II p-6 N-4 R930 ;I:: R-3 R-2 T-6 T-6 T-5 x-9 y-8 w-5 v-4 w-2 b-4 2-2 c-2 u-12 T-11 U-l I T-V u-10 u-9 NOT USED NOT USED x-12 W-II Y-12 2-12 a-12 NOT USED b-8 c-7 d-12 e-12 e-11 e-10 f-12 f-11 :: ~-28 E-28 D-27 D-27 L-9 _: 7-31 t I t p===- ir I I I I I R408 1001 - -29.5” 21 ““REG. > , I I ; I ~!, ’ ! I E - . c c - c - ~R~PLACEABLE PARTS INSTRUCTION MANbAL Digital Multimeter Models 172.173 CAPACITORS Circuit ! sig. Mfr. Code Description "800" L"Ol C802 ( 03 I 04 c805 r"06 [ 07 ~808 rRo9 I IO Loll C812 1 iI3 iI4 ~815 .",I6 :I7 C818 '919 i20 Ld2l CPW 310 7-6 SERIES 0.1 IJF, 200V. ......... IO uF, 2OV, ETT. ....... 4.7pF, 2OV, ETT. ....... 150 pF, IOOOV, CerD. ..... IO pF, ZOV, ETT. ....... IO vF, 2OV, ETT. ....... 220~F, IOV, ETT. ....... 120 LIF, IOV, ETT ....... I20 ~.IF, IOV, ETT ....... 10 pF, 2OV, ETT. ....... 33 pF, IOOOV, CerD ...... IO uF, 2OV, ETT. ....... IO uF, ZOV, ETT. ....... 22OOpF,5OOV, Mica* * * * * * * 0.01 uF. lb'/, CerD ...... 145pF, SOOV, Mica. ...... 1.9-15.7 pF,'25OV, Trimmer . . 144OpF, 500V. Mica ...... .25-I.5 pF, Variable ..... .25-1.5 pF, Variable ..... .25-I.5 pF, Variable ..... "900" 301 c902 '903 304 ‘-305 ~906 307 308 (C) SERIES (Schematic . . . . . . . . . . . . . . . ' ' . ECI C-l ITT CLB C-l C-l SIE C-l C-l C-l CLB C-l C-l G-l CLB G-l EFJ G-l EFJ : EFJ . EFJ (Schematic 0.01 uF, 5OV, MPC. ........ ECI 0.1 PF, IO%, 200VDC. ....... TRW 33 pF, IOOOV, CerD ........ CLB 0.15 liF, IO%, 200VDC ....... TRW 0.15 uF, IO%, 200VDC ....... TRW . CLB 1000 PF, 5OOV, poly O.OluF. 1200~ . . . : : : : : : . STD .I ui. 'IOOOV 20% . . . . . . . . . STD uF; IbVDC ........... CLB PF, I6VDC ........... CLB Mfr. Desig. Keithley Part No. 28656E) 625~lcl04 TD2-20-106-20 TAP4X7E200 DD-I51 TD2-20-106-20 TD2-20-106-20 D220EDlOMl TD5-010127-20 TD5-010127-20 TD2-20-106-20 DD-330 TD2-20-106-20 TD2-20-106-20 ROMISFD UKl6-103 145PF,l% 187-0109-005 273-l-l c-221-.IH C-l79-IOM c-l79-4.7n ~-64-150~ C-179-IOH C-l79-IOH C-78-220M C-180-12OH C-l60-l20H c-l79-lon C-64-33P C-l79-IOM c-179-10H ~-278-2200~ C-238-.OIH C-278-l45P C-284-l.v-15.7P C-278-l44OP C-l84-.25-1.5P C-l84-.25-l.5P C-184-.25-1.5P 28656E) 625BlAl03-J I-200-IO-X363UW DD-330 15-200-IO-~363~~ 15-200-IO-~363~~ CPR-1000 PYW-R-.01 M2WF-O.luF ~~16-104 ~~16-104 C-201-.OlM c-269-. IM C-64-33P C-269-.l5M C-269-.l5M ~-138-1000~ C-286-0.01~ C-285-.lM C-238-.lM C-238-.lM AB I INSTRUCTION MANUAL REPLACEABLE PARTS Digital MultImeter Modeis172.I73 CAPACITORS Circuit Desig. Mfr. Code Description "1000" Cl001 "1100" CIIOI Cl102 Cl103 Cl104 Cl105 cl106 Cl107 AB SERIES (Schematic 0.01 uF, 5OOV, CerD ......... 0.01 IJF, l6v, CerD. ......... 0.01 pF, lbv, CerD. ......... 0.01 uF, 16v, CerD. ......... 1550 uF, 25V, EAL .......... 0.01 uF, 5OOV, CerD ......... 0.01 pF, l6v, CerD. ......... 1000 pF, IOOOV, CerD. ........ 0.01 pF, l6v, CerD. ......... 39 pF, l5V, ETT ........... 0.01 uF, 16v, CerD. ......... 0.01 pF, 16v, CerD. ......... 0.01 uF, l6v, CerD. ......... 0.01 pF, l6v, CerD. ......... 10 uF, 2OV, ETT ........... 0.01 uF., l6v, CerD. ......... CerD. ......... 0.01 uF, l6v, 100 uF, l5V, ETT. .......... Cl002 Cl003 Cl004 Cl005 cl006 Cl007 Cl008 Cl009 CIOIO ClOll Cl012 Cl013 Cl014 Cl015 cl016 Cl017 cl018 I 0.01 0.01 I.2 0.01 0.01 220 1000 (C) SERIES UF, 16~. CerD. ......... PF, Ibv, CerD. ......... uF, 20%, 20V. .......... uF, l6v, CerD. ......... uF, l6v, CerD. ......... pF, IOOOV, CerD ......... pF, \ooOV, CerD. ........ 27902E, ERI CLB CLB CLB RIG ERI CLB ERI CLB C-l CLB CL6 CLB CLB ITT CLB CLB C-l (Schematic 28019E, CLB CLB C-, CLB CLB CLB ER, Mfr. Desig. Keithley Part No. PC-415) 871-25~0-103~ ~~16-103 U~l6-103 UKl6-IO3 MDl6C1550258P 871-Z5~0-103~ UKl6-103 808-OOO-Z5RO-IOZK UK16-103 TD4015396lD U~l6-103 UKl6-103 ~~16-103 UKl6-103 TAP/FOlOF200 UKl6-103 U~l6-103 T0501510710 C-22-.OlM c-238-.011.1 C-238-.OIM C-238-.Olfl C-272-l59OH c-22-.OlM C-238-.OlH C-64-1000~ C-238-.Oln C-228-39tI C-238-.OIH C-238-.011 C-238-.Oltl C-238-.Olfl C-179-10n C-238-.OlM C-238-.OlM C-228-100~ PC-416) UK16-103 ~~16-103 TDI-20-125-20 UKl6-103 UKl6-103 DD-221 608-OOO-ZSRO-102K C-238-0.01~ C-238-0.01~ C-179-l.2H C-238-0.01~ C-238-0.01~ C-64-220P ~-64-1000~ l-7 1 PFPLACEABLE PARTS INSTRUCTION MANUAL Digital Mullimeter MC&Is 172.173 DIODES 'ircuit esig. Mfr. Code Description "000" CROOl CR002 1003 Rectifier, Rectifier, Resonator. SERIES Rectifier, Rectifier, 75 mA, 75V. 75 mA, 75V. SERIES . . . . "200" rU201 ?202 LA203 CR204 3205 ~'1206 CR207 .7208 1209 CR210 'Q211 1212 ~~213 rR214 Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, Diode, Dual, Rect ifier, Rect ifier, Rect ifier, Rect ifier, Rectifier, Rectifier, Rectifier, Rectifier, 75 7.5 75 75 75 mA, mA, mA, mA, mA, Low 75 mA, 75 mA, 75 mA, 75 mA, 75 mA, 75 mA, 75 mA, 75 mA, 75V. 75V. 75V. 75V. 75V. Leakage 75v. 75V. 75V. 75V. 75V. 75V. 75V. 75V. '-8 Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, (Schematic . . . T-l . . . T-l SERIES . . . . . . , T-1 . . T-1 . . T-1 . . . . . . . . . , . . . . . . . 75 mA, 75V. ..... 75 mA, 75V. ..... I A, 800~ ...... 75 mA, 75V. ..... 75 mA, 75V. ..... I A, 800~ ...... 75 mA, 75V. ..... 75 mA, 75V. . . 1 A, 800~ . . . 75 mA, 75V. . . (Schematic . . T-1 . . . . T- I , , . . . , , . . Gb400" SERIES R401 R402 CR403 'R404 R405 ~~406 CR407 R408 ,R409 CR410 (Schematic 75 mA;75V. . . . . . . T-l 75 mA, 75V. . . . . . . T-l Ceramic, 669 kliz. . . . VER "100" CR101 RIO2 (CR) . . . . . . . IN T T-l T-l T-1 T-l T-l T-l . T-l . T-l (Schematic T-l T-l MOT T-l T-l MOT T-i T-l . . . * . . MO7 . . . T- I Mfr. Desig. Keithley Part No. 28656~) lN914 IN914 TF-01-669 RF-28 RF-28 CR-7 28656E) IN914 IN914 RF-28 RF-28 28656E) lN914 IN914 IN914 IN914 IN914 ID101 IN914 IN914 IN914 IN914 IN914 lN914 RF-28 RF-28 RF-28 RF-28 RF-28 DN-3 RF-28 RF-28 RF-28 RF-28 RF-28 RF-28 IN914 IN914 RF-28 RF-28 2675GC) IN914 lN914 1~4006 IN914 IN914 I N4006 I NY14 I N914 I ~4006 I N914 RF-28 RF-28 RF-38 RF-28 RF-28 RF-38 RF-28 RF-28 RF-38 RF-28 A0 INSTRUCTION REPLACEABLE MANUAL PARTS Dlgllel Mulllmeter Models 172.173 DIODES Circuit Desig. Mfr. Code Description "500" CR501 CR502 CR503 CR504 CR505 CR506 CR507 CR508 CR509 Bridge Rectifier, BridgyRectifier, IOOV, IOOV, "700" CR701 CR702 CR703 CR704 CR705 Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, 75 75 IA, 75 75 Rectifier, Rectifier, Rectifier, Rectifier, 75 mA, 75V 75 mA, 75V 75 mA, 75V 75 mA, 75V "900" CR901 CR902 CR903 CR904 CR905 AE Rectifier, Rectifier, Rectifier, Rectifier, Rectifier, 75 75 75 75 75 SERIES 2 A. 2 A. mA, WI, mA, mA, mA, 75V. 75V. 75V. 75V. 75V. (Schematic . . . EDI . . EDI SERIES SERIES ...... ...... ...... ...... SERIES ...... ...... ...... ...... ...... (Schematic 50~ ED I T- I T- I T- I . T- I T-l . . . T-l . . T-l . . T-l mA, 75V ...... mA, 75V. ...... ....... 800~. mA, 75V. ...... mA, 75V. ...... "800" CR801 ~~802 CR803 CR804 SERIES Bridge Rectifier, 4 d Dde, 5A, Rectifier, 75 mA, 75~ ...... Rectifier, 75 mA, 75V ...... Rectifier, 75 mA, 75V ...... Rectifier, 75 mA, 75V. . . . Rectifier, 75 mA, 75V . . . Rectifier, 75 mA, 75V . . . . Rectifier, 75 mA, 75V . . . Rectifier, 75 mA, 75V . . . . "600" CR601 ~~602 (CR) (Schematic T-l T-l MOT T-l T-l (Schematic Mfr. Desig. 27478D) PE05 IN914 IN914 lN914 IN914 IN914 IN914 lN914 IN914 RF-48 RF-28 RF-28 RF-28 RF-28 RF-28 RF-28 RF-28 RF-28 28656E) PDIO PDIO RF-36 RF-36 28656~) lN914 lN914 IN4006 IN914 IN914 RF-28 RF-28 RF-38 RF-28 RF-28 28656E) T-l T-l T-l T-l IN914 IN914 IN914 IN914 (Schematic 28656~) T-l T-l T-l T-l T-l Keithley Part No. IN914 IN914 IN914 lN914 IN914 RF-28 RF-28 RF-28 RF-28 RF-28 RF-28 RF-28 RF-28 RF-28 7-9 : , .EPLACEABLE PARTS INSTRUCTION MANUAL Digllal Mullimeter Models 172,173 (CR) DIODES Circuit Desig. Mfr. Code Description "1000" CRIOOI CR1002 SERIES (Schematic Rectifier, 75 mA, 75V . . . . . . Bridge Rectifier, lOOV, 2A. . . . "1100" Rectifier, CR1101 75 mA, 75V . . . . . "300" DS311 DS312 OS313 DS314 DS315 Digital Digital Digital Digital Digital Light, Light, Light, Light, Light, Light, Light, Light, Light, Light, 7-10 Pilot Display, Display, Display, Display, Display, Light, (Schematic Red, LEO. . . . . . . H-P Light-Emitting Diode. H-P Light-Emitting Diode. H-P Light-Emitting Diode. H-P Light-Emitting Diode. H-P Light-Emitting Diode. H-P Light-Emitting Diode. H-P Light Emitting Diode. H-P Light Emitting Diode. H-P Light Emitting Diode. H-P T-segment T-segment T-segment T-segment 7-segment "600" 0~601 SERIES Light . . . . . . . , . . . . . . . . . . SERIES Emitting H-P H-P H-P H-P H-P (Schematic Diode. Keithley Part No. PC-415) IN914 PDIO RF-28 RF-36 28019E) IN914 RF-28 Mfr. Desig. Keithley Part No. (DS) Mfr. Code Description Pilot Pilot Pi lot Pi lot Pilot Pilot Pilot Pilot Pilot Pilot T-l E-D T-l i OS30 I DS302 OS303 DS304 OS305 DS306 OS307 DS308 DS309 DS310 27902E, SERIES (Schematic DISPLAYS Circuit Desig. Mfr. Desig. H-P 274040) B-031075-2501-1 HP5082-4494 HP5082-4494 HP5082-4494 ~~5082-4494 HP5082-4494 HP5082-4494 HP5082-4494 ~~5082-4494 ~~5082-4494 ~~-64 PL-63 u-63 PL-63 ~~-63 PL-63 PL-63 PL-63 PL-63 PL-63 5082-7650 5082-7650 5082-7650 5082-7650 5082-7650 DD-13 DD-13 DD-13 DD-13 DD-13 28656E) HP5082-4494 PL-63 AB : INSTRUCTION MANUAL REPLACEABLE PARTS Digital Multimeter Models 172.173 FUSES (F) Circuit Desig. Description "400" F401 F402 F403 lA, lA, IA, 3AG, 3AG, 3AG, 25OV, 25OV, 25OV, SERIES Slo-Blo Slo-Blo Slo-Blo (Model (Model 173) 172) 3A, 2A, 25OV, 25OV, 3AG, 3AG, SERIES Quick. Quick. "600" F6Ol Slo-Blo, Slo-Blo, 1/4A, 1/8A, Mfr. Desig. (Schematic 26758C) . . . . . . FUS . . . . . . FUS . . . . . . FUS "500" F501 Mfr. Code (Schematic . . SERIES 3AG (117V). 3AG (22OV). . . . . . L-F . . L-F (Schematic . . L-F . . BUS MDL-IAMP MDL-IAMP MDL-IAMP Keithley Part No. FU-IO FU-IO FU-IO 27478D) 312003 312002 FU-2 FU-13 28656~) 313.250 MDL-l/8 FU-17 FU-20 Mfr. Desig. Keithley Part No. CONNECTORS (J) Circuit Desig. Mfr. Code Description "200" J201 Socket, l4-pin DIP . . . . "400" J401 J402 5-pins 5-pins J502 J503 -- AB (Schematic . C931402 26758C) . . . . . . . . . . ..MOL . . . . . . . . , . . . . MOL 2139-5 2139-5 5-pin Housing. . . . . . 8-pin Housing. . . . . . 2-pin Housing.(Model 173 Female Contacts (2 req'd SERIES . T-l 28656~) (Schematic "500" J5Ol SERIES SERIES (Schematic . . . . . BRG . . . . . BRG only) MOL for J503j MOL so-70 CS-287-5 CS-287-5 27478D) 20370 65039c 03-06-1023 02-06-5103 cs-251 cs-310 ~~-326-2 ~5-328 7-11 I REPLACEABLE INSTRUCTION PARTS, MANUAL Dipllsl Multimeter Models 172.113 CONNECTORS (J) Circuit Desig. Mfr. Code Description "600" J60 I 5602 J603 J604 ---J605 J606 J607 J608 J609 Housing, Housing, Housing, S-pins 6-pins. 2-pins, (Schematic Not Used Not Used Not Used Card-edge Card-edge SERIES ................. ................. ................. connector. connector. ........... ........... SERIES (Schematic ... (Schematic 2139-2 ----- CS-275 65039-034 75691-005 ___ --- CS-270 CS-236 105-0602-001 105-0610-001 BJ-IO-2 BJ-IO-9 BJ-IO-6 105-0601-001 --- ----- 28656E) ----POM POM POM POM (mates with ~~-236). ............. MINI-PV ......... "1100" JllOl JllO2 J1103 JllO4 J1105 SERIES Keithley Part No. 28067D) HOL ----BRG BRG ----EFJ EFJ EFJ Not Used ................. Not Used ................. Banana Jack, Red ............. Banana Jack, Black ............ Banana Jack, Red ............. Banana Jack, Black ............ "1000" JlOOl JIOOZ JlOO3 (Schematic 2-pins .................. Not Used ................. Not Used ................. 3-pin Housing. .............. Female pin (3 req'd for ~604). ...... Not Used ................. Not Used ................. Tip Jack, Recessed, Red. ......... Tip Jack, Recessed, White. ........ Tip Jack, Recessed, Blue ......... "900" J901 J90.7 J903 J904 J905 J906 SERIES Mfr. Desig. ----- 2854 2854 2854 2854 ----_ BJ-9-2 BJ-9-C BJ-9-2 BJ-9-O 20370 65043-093 65039-035 CS-251 cs-335 CS-266 27902E) BERG BERG BERG 28019E) ------MOL HOL ___ ___ --- 09-52-3102 09-52-3122 ___ --_ ___ CS-332-10 CS-332-12 i INSTRUCTION Digital MultImeter REPLACEABLE MANUAL PARTS Models 172,173 RELAYS Circuit Desig. Mfr. Code Description "500" KS01 KS02 K503 K504 KS05 Relay, Relay, Relay, Relay, Relay, Reed, Reed, Reed, Reed, Reed, 0.5A, 0.5A, O.SA, 1.5A, 3A. . Kg01 Relay, Relay. Form Form Form Form . , SERIES A. A. A. A. . . & “900” "800" K801 (K) (Schematic . . . . . . . . . . . . . . . . . . . SERIES WAB WAB WAB QTN WA6 (Schematic reed, form 1 A, 20V . . . . WAB . . . . . . . . . . . . . . P&B Mfr. Desig. Keithley Part No. 274780) 1170-3-I 1170-3-I 1170-3-I H5AlM-S20 1170-2-I RL-44 RL-44 RL-44 RL-50 RL-49 27903E) 1170-s-2 RIO-E3738-1 RL-53 RL-51 CONNECTORS (P) Circuit Desig. Mfr. Code uescrlptl0n "100" PI01 j-pin Housing. SERIES . . . . . "300" P301 Cable p503 Not Used Not Used Connector AB SERIES (Schematic 27404D) K- I __ (Model Receptacle, Receptacle. Receptacle, Receptacle, Receptacle, Receptacle, Not Used Not Used Not Used Line Cord. 5-pin. 2-pin. 4-pin. 3-pin. 2-pin. 5-pin. (Schematic _-__ 172 only) "600" p601 ~602 P603 ~604 ~605 P606 ~607 P608 ~609 ~610 65507-136 SERIES . . . . . . . . . . . . . . . . . SERIES . . . . . . . . . . . . . . . . . . . . . . . . . . . (Schematic . . . . . . . . . . . . . . . MOL MOL BRG BRG BRG MOL _--- . BLD Keithley Part No. 28656~) . . . . . BRG Assembly "500" P501 P502 (Schematic Mfr. Desig. CS-3B-3 2796lA 28656E) -_ -__ 28656E) A-2391-5A -- ~~-288-5 ~~-288-2 (35-339-4 CS-339-3 CS-339-2 CS-288-5 _- 17237 -co-g A-2391-5A A-2391-2A 65507-136 65507-136 65507-136 7-13 IF’PLACEABLE PARTS INSTRUCTION MANUiL Digital Multimeter Models 172.173 CONNECTORS (P) Circuit esig. Mfr. Code Description "900" 901 P902 Connector Connector PI003 '1004 '1005 b1006 . . . 8-pin . . . . . . . . . . . . . . . . ERG SERIES . . . . . . . . ERG (Schematic Not Used. . . . . . . . . . . . Not Used. . . . . . . . . . NotUsed..................--Connector, 10 pins. . . . . . . , Connector, 12 pins. . . . . . . . Card-edge, 40 pins (part of Model "1100" '1101 . Card-edge, 26-pin (part SERIES of . . . , . MOL . . . . . t4OL 1727. . . MMM 1727). 100 I JO02 Qoo3 Transistor, Dual, NPN, Case TO-106. NPN, Case TO-106. Monolithic ............. ............. "100" 1101 12102 Ql03 1104 J105 Q106 2107 1108 QlOT 2110 21 11 4112 Q113 .-I4 . . MMM (Schematic PNP. SERIES ------og-67-1104 09-67-1124 ___ ----- 3464-0000 cs-331-10 (35-331-12 cs-294-J 3462-0000 CS-294- 1 Mfr. Desig. Keithley Part No. AD820 TG-121 TG-65 TG-65 (Q) Mfr. Code SERIES cs-339-8 (35-339-4 28019E) Description "000" 65507-136 65507-136 PC-415) . . . . . --. . . . . --- TRANSISTORS Circuit bsig. 27902E, (Schematic Model Keithley Part No. 28656E) (Schematic 4-pin "1000" 1001 rl002 SERIES Mfr. Desig. ..... (Schematic 28656E) A-D F-l F-l 2N5134 2N5134 28656E) PNP Silicon, TO-92 Case ...... . . . . MOT Differential Amp. ......... . . . . INT NPN, Case TO-106 ("Selected TG-39). . . . . F-l P-Chan HOS FET. .......... * . . . INT Differential AMP. ......... . . . . INT Dual FET. . . . . . . . . . . . . . . . . . SIL N-Chan, J-FET ', Case TO-18 . . . . . . . . . INT . . . . . . . . . . . . . . INT N-Ghan, J-FE7 '. N-than, J-FE1 ., Case TO-18 . . , . , . . . . INT N-Chan, J-FE1 Case TO-18 . . . . . . . . . INT N-Ghan, J-FET : Case TO-18 . . . . . . . . . INT N-Ghan, J-FET , Case TO-18 . . . . . . . . . INT N-Ghan, J-FET, Case TO-18 . . . . . . . . . INT 2N3905 IT122 2N3565" 3N163 IT122 E411 ITS3538 ITE4392 rTs3%8 ITS3538 ITS3538 I::::;: TG-53 TG-73 28234A+ TG-126 TG-73 TG-118 TG-88 TG-77 TG-88 TG-88 TG-88 TG-88 TG-88 AB INSTRUCTION Digttel MANUAL REPLACEABLE PARTS Multimeter Models172,173 TRANSISTORS Circuit Desig. Mfr. Code Description "200" SERIES Q208 Q209 4210 Q211 Q212 N-Char,, J-FET, Case To-929 . N-Ghan, J-FET, Case TO-18. . N-Ghan, J-FET, Case TO-92. . N-Ghan, J-FET . . . . . . . . N-ChaE, J-FET, Case TO-92. . Transistor, NPN, Case TO-106 PNP, TO-92 Case . . PNP, Case to TO-92 . . : : : N-Ghan, J-FET, Case TO-92 , N-Ghan, J-FET, Case TO-92 . N-Ghan, J-FET, Case TO-92 . Transistor, h]PN, Case TO-106 4213 Q214 Q215 Q216 Transistor, Transistor, Transistor, PNP, TO-92, "Selected TG-39 Q201 Q202 Q203 Q204 QX'5 Q206 Q207 NPN, Case TO-106 NPN, Case TO-106 NPN, Case TO-106 Case TO-106. . . "300" Q3Ol 4302 :;z ::z Q307 Q308 Q3W 4310 Q311 4312 AB PNP, PNP, PNP, PNP, PNP, PNP, PNP, PNP, PNP, PNP, PNP, PNP, PNP, PNP, Case Case Case Case Case Case Case Case Case Case Case Case Case Case TO-106 TO-106 TO-106 TO-106 TO-106 TO-106 R-110. R-110. R-110. R-110. R-110. R-110. R-110. R-110. ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... SERIES (Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NAT INT NAT INT NAT F-l MOT MOT NAT NAT NAT F-l INT INT INT MOT (Q) Mfr. Desig. Keithley Part No. 28656E) PN4392 ITS3538 PN4393 ITE4392 PN4392 2N3565 2N3905 ITS3538 PN4392 ~~4392 PN4392 2N3565 2N3565 2N3565 2N3565 2N3905 (Schematic 27404D) F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l 2N4355 2N4355 2N4355 2N4355 2N4355 2N4355 517638 S17638 517638 517638 Sl7638 517638 Sl7638 ~17638 TG-129 TG-88 TG-130 K-77 TG-130 TG-39 X-53 TG-53 TG-128 TG-128 TG-128 TG-39 28234A 28234A 28234A TG-53 f * -' TG-90 TG-90 TG-90 TG-90 TG-90 TG-90 TG-33 TG-33 TG-33 TG-33 TG-33 TG-33 TG-33 TG-33 7-15 i I IPLACEABLE PARTS INSTRUCTION Digilal MANUAL Mullimeter Models 172,173 TRANSISTORS lrcuit Desig. Mfr. Code Description "400" Q4Ol Q402 :“4:: Q405 Q50 1 2701 1702 Q703 Q704 1705 J706 Q707 1708 1709 Q710 PNP, Case TO-5 . . . . . . . NPN, Case TO-39. . . . . . . PNP, Case TO-5 . . . . . . . NPN, Case TO-106 . . . . PNP, Case TO-92 "500" SERIES Transistor Array, 4805 **selected Q303 7-16 . . . . DIP "700" SERIES NPN, Case TO-106 . . . . N-Chan, J-FET. . . . . . N-Ghan, J-FET, Case TO-18. PNP Silicon, Case TO-92. NPN, Case TO-106 . . . . Silicon, PNP TO-92Case . N-Chan, J-FET, Case TO-18. NPN. Case TO-106 ("Selected NPN, Case TO-106 ("Selected FET, Case TO-18 ("Selected . . . . RCA MOT RCA F-l MOT (Schematic . . . . . . SERIES SERIES . RCA (Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . TG-39) TG-39) TG-88) FET, Case TO-72 . . . . . . . . PNP Silicon, TO-92 Case . . . . Dual FET. . . . . . . . . . . . FET, Case TO-18 ("Selected TG-88) Transistor Array, I4-pin DIP. . IC-53 "900" Q9Ol 4902 (Schematic l4-pin "800" Q801 4802 SERIES . . . . . . . F-l INT INT MOT F-l MOT INT F-l F-l INT (Q) Mfr. Desig. 26758C) 2N4032 2N3300S 2N4032 2N3565 2N5087 C~3086 TG-39 TG-61 IC-53 28656E) 2N3565 ITE4392 ITS3538 MPS'tO'tA 2N3565 2115087 ITS3538 2N3565" 2N3565" ITS35385 28656E) . . . SIG MOT SIL INT RCA 2D2lO 2N3905 E411 ITS3538" c~3086+* (Schematic 28656E) N-Chan, J-FET, Case TO-18. . . . . INT NPN, Case R-110. . . . . . . . . . F-l PNP Silicon, TO-92 Case. . . . . . MOT TG-92 TG-II7 TG-92 274780) (Schematic . Keithley Part No. TG-39 TG-77 TG-88 TG-99 TG-39 TG-61 TG-88 28234At' 28234A:' 28250~:: TG-119 TG-53 TG-II8 28229A" 28228~"" ITS3538 TG-88 2N3643 TG-123 K-53 2N3905 BA I INSTRUCTION MANUAL Digital Mullimeler Mod& REPLACEABLE 172,173 TRANSISTORS Circuit Desig. QIOOI 41002 Q1003 Ql004 Q1005 Q1006 QlOO7 41008 QIOOV QIOIV PI020 Ql02l Q1022 Q1023 41024 Ql025 ~I026 QiO27 ~1028 al029 Q1030 QlO3l QlO32 Q1033 Q1034 Qlo35 41036 41037 Mfr. Code NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN. NPN; NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, NPN, PNP, PNP, PNP, PNP, Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case Case TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. TO-106. R-110 R-110 R-110 R-110 . . . . . . . . . . . . . . . * . * . . . . . . AB NPN, Case TO-106. SERIES . . . . . . I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .‘. SERIES . . Mfr. Desig. 27902E, . . . . . . . . . . . . . . . . . . . . . . . . (Schematic . . . . . . . . . . . . . . . . . . . . . . . . . "1100" QllOl (Q) Description "1000" QIOIO QIOII QIOIZ QlOl3 41014 QlOl5 QlOl6 QlOl7 41018 PARTS . F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l FFFFFFF- I F- I F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l F-l (Schematic . . . . . Keithley Part No. PC-415) 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 2N5134 517638 S17638 Sl7638 Sl7638 TG-65 TG-6j TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-6$ TG-65 TG-65 TG-65 TG-65 TG-65 TG-65 TG-33 TG-33 TG-33 TG-33 28019E) F-l 2N5134 TG-65 7-17 REPLACEABLE INSTRUCTION MANUAL DiglmlMultimeler PARTS Models RFSISTORS ircuit Desig. Mfr. Code Descriptioq "000" 4001 1002 II003 R004 ioo5 .3006 ROO7 x008 1009 ROlO TOI1 3012 R013 RO14 Rlll Rll.2 Rll3 R114 ~206 R207 R208 R209 R210 R211 R212 (Schematic IRC K-1 A-B A-B A-B IRC IRC .A-8 IRC IRC IRC IRC IRC A-B SERIES (Schematic 280 :., I:, 1/8w, MtF ....... 280 12, 12, 1/8W, MtF ....... I kR, Potentiometer, 0.5W. .... 6.336 kti, O.l%, 1/8W, MtF. .... 150 kg, 15, 1/8W, MtF. ...... 470 G, IO?, 1/4W, Comp ...... 470 Sl, 102, 1/4W, Comp ...... 200 kc, I'/., 1/8W, MtF. ...... Thick Filr Resistor Network. ... Thick FilResistor Netviork. ... 22ki., IO:, 5&, 43k:., 22Kli , 1Oi * 22~:!, IO?, 1/4W, 1/4W, l/4W, 1/4W, Comp ...... Camp. ..... Camp. . ' Comp ' . ' "200" R201 R202 R203 R204 R205 SERIES 6.04 k;., It, 1/8w, HtF ...... Thick Film Resistor Network. ... 10 k!:, IO:, 1/4W, Camp ...... 18 kc, 105, 1/4W, Comp ...... 6.8kr., lOI:, l/4W, Camp. ..... 5.49k:., l;, 1/8w, MtF ...... 12, 1/8W, MtF ...... 7.6&:., IOM::, IO 4. 1/4W, Comp ...... looii, IS, 1/8W, MtF ....... I.5Kn, 1%. 1/8W, Mtf. ...... 4.22KT., IZ, 1/8w, MtF ...... I.l5Kn, I%, 1/8w, MtF ...... 49.gK,‘l%, 1/8w, HtF. ...... I/~w, Comp. ...... 15::. 102, "100" RIOI RI02 RI03 R104 RI05 RIO6 RI07 RI08 RlOY RI10 (R) 5 kR, 0.5W, Var. ......... 374 R, l$, 1/8W, MtF ....... 7.50 kR, O.l%, 1/8w. ....... 7.50 kR, 0.8%, 1/8w. ....... 28.0 kn, 0.5%, 1/8w. ....... Part of 280408 Part of 280408 20 kR, Potentiometer, 0.5W .... 500 R, Potentiometer, 0.5W .... Thin Film Resistor Network .... 23.2 kn, I%, 1/8w, MtF ...... 332 kR, O.l%, 1/8W, MtF. ..... Keithley Part No. 28656E) CEA-TO-6.04K -CB-IOO-10% CB-loo-IO% CB-682-10: CEA-TO-5.49K CEA-TO-7.68K ca-106-10% CEA-TO-100 CEA-TO-1.5K CEA-TO-4.22K CEA-TO-1.15K CEA-TO-49.9K CB-150-104 R-88-6.04K TF-47 R-76-1OK R-76-t8K R-76-6.8~ R-88-5.49~ R-88-7.68~ R-76-10~ R-88-100 R-88-1.5K R-88-4.22~ R-88-l.lSK R-88-49.9~ R-16-.15 28656E) IRC IRC BEC DLE IRC A-B A-B IRC K-l K-l CEA-TO-280 CEA-TO-280 72PMR MFF-l/8-6.336~ CEA-TO-I5OK CB-121-104 CB-121-IO% CEA-TO-2OOK -__ A-B MEP A-B A-B CB-223-102 CR-25-43K CB-223-102 cB-223-tot (Schematic 28656E) . . ' ' SERIES Mfr. Desig. R-88--280 ~-88-280 RP-97-IK R-168-6.336K R-88-1501( R-76-470 R-76-470 R-88-200K TF-49 TF-46 R-76-22K R-248-43~ R-76-221; R-7b-z2kc BEC IRC DLE DLE DLE 72PMR-5K CEA-TO-374 MFF-l/8-7.50K MFF-l/8-7.50K HFF-l/8-28.OK RP-97-5K R-88-374 R-168-7.50K R-168-7.50K R-246-28.OK BEC BEC K-l IRC DLE 72PMR-20K 72PMR-500 -CEA-TO-23.2K HFF-l/8-332K RP-97-20K RP-97-500 TF-56 R-88-23.2K R-168-332K 172.173 i INSTRUCTION Digllal Models MANUAL REPLACEABLE RESISTORS Circuit Desig. (R) Mfr. Code Description "200" SERIES Mfr. Desig. Keithley Part No. (Cont'd) R213 R214 R215 R216 R217 R218 R219 100 k", 5%, 0.5W . . . . . . . . . BRN Thick Film Resistor Network. . . . K-l Thick Film Resistor Network. . . . K-l 909 2, I%, 1/8w, MtF . . . . . . . IRC 10 kT., Potentiometer, 0.5W . . . . BEC Thick Film Resistor Network. . . . K-l 1.8 kc, I%, 1/8w, MtF. . . . . . . IRC 32ggw-11-104-51 --CEA-TO-909 72PMR _CEA-TO-1.8K RP-ll4-IOOK TF-51 TF-45 R-88-909 RP-97-IOK TF-50 R-88-l.8K R220 R22l R222 R223 R224 R225 R226 IO kc, I%, 1/8w, MtF . . . 200 r., I%, 1/8w, MtF . . . 200 kR, I%, 1/8w, MtF. . . 39 kR, IO%, l/4W, Comp . . Thick Film Resistor Network. 10 kR, I%, 1/8w, MtF . . . 2lOkn, I%, 1/8w, MtF . . . 22 R, IO%, l/4W, Comp. . . 22 R, IO%, l/4W, Comp. . . 15 kC, IO%, 1/4W, Comp . . Thick Film Resistor Network. 8.2 k.l, IO%, 1/4W, Camp. . R22J ~228 R229 R230 R231 "300" R301 R302 R303 R304 Thick Thick I R, Film Resistor Film Resistor 12, 1/2w. . . R40J ~408 R409 R4lO R4ll R412 R413 R414 AB . . . . . . . . . . . . . . . . . . . . . + SERIES 2.2::, 5%,1/4W . . . . . . . I%, 1./8w, MtF . . IO%, 1/2w, Comp . IO%, 1/2W, Comp . 13.Jn, I%, 1,/8w, MtF . . 3.3 0, IO%, 1/2W, Comp . 1.5 kI?, IO%, 1/2W, Comp. 71.5 kn, I%, 1/8w, MtF . 100 kc, 10%. 1/4W, Comp. 2.2 kn, IO%, 1/4W, Comp. 76.8 kR, l%, l/Ew, MtF . 499 kR, I%, l/Ew, MtF. . 100 kR, 14, ~/SW, MtF. . II0 kR, I%, 1/8w, MtF. . 499 k.'., I%, 1/8w, MtF . 13.711, 12 kn, 12 kn, . . . . . . . . . . . . Network. . . Network. . . . . . . . . "400" R401 R402 R403 R404 R405 ~406 PARTS Mulllmeter 172,173 . SERIES . . . . . . . . . . . . . . . . . . . . . . IRC IRC IRC A-B K-l IRC IRC A-B A-B A-B K-l A-B CEA-TO-IOK CEA-TO-200 CEA-TO-2OOK CB-393-10% -CEA-TO-IOK CEA-TO-21OK CB-loo-lo% CB-IOO-IO% CB-IOO-IO? _ _ R-88-10K ~-88-200 R-88-200K R-76-39K TF-48 R-88-IOK R-88-210K R-76-22K R-76-22K R-76-l5K TF-60 ~~-822-108 R-J6-8.2K (Schematic 27404D) K-l BEC IRC __ DLE 898-3-R62 DCC-IT: 588-2.21. (Schematic 26758C) IRC A-B . * A-B . . IRC . . . . . A-B A-B . . IRC . . . . A-B A-B . . IRC . . IRC . . IRC . . IRC . . IRC . . . . . . . . . . . . . . . . . . . . . . CEA-TO-\3.7<: EB-123-10:; EB-l23-10% CEA-TO-l3.7fi EB-3R3-10% EB-152-10% CEA-TO-71.5K cB-io4-io%CB-222-10% CEA-TO-76.8K CEA-TO-499K CEA-TO-IOOK CEA-TO-IIOK CEA-TO-499K TF-42 TF-43 R-12-1 R-248-2.2 R-88-13.7 R-I-l2K R-I-l2K R-88-13.7 R-l-3.3 R-I-l.5K R-88-71.5K R-76-IOOK R-76-2.2K R-88-76.8K R-88-ig9K R-88-IOOK R-88-IIOK R-88-49pK 7-19 i I ZPLACEABLE PARTS INSTRUCTION MANUAL Digital Mullimeler Models 172.173 RESISTORS Circuit Desig. Mfr. Code Description "500" R501 R502 R503 R504 R505 R506 R507 R508 R509 R510 R51 I R512 R513 R514 Not Used 900 n, 0.05%. 1/2W ........ i/Ew. ........ 90 n, 0.059, 9.1 c', 0.5:;. 1/2W. ........ 499 R, I?, 1/8w, MtF ....... IO k!:, 0.5W, Var ......... 0.91 r!, 0.52, 5w ......... 40.2 n, I%, 1/8w, MtF. ...... I k.rl, O.SW, Var. ......... 0.102 R, 0.5%, IOW ........ 2.7 R, IO%, 1/4W, Comp ...... IO R, O.SW, Var. ......... Thick Film Resistor Network. I R, O.l%, IOW, WW ........ r R502-R513 2514 used R515 R516 R517 SERIES JO.IKR, 50. KR, 30. KR, SERIES R60 1 120 R, 5%, R602 R603 120 Cl 5%, IW, Comp. ................ ISQ, 5%. SW, ww. 680 n, IO%, 1/2W, Comp ...... R609 R610 R611 R612 7-20 100 R, ... used on Model 173 only. dn Model 172 only. 7 I%, l/Ew, MtF I%, 1/8w, MtF I%, 1/8w, MtF "600" R604 R605 R606 R607 R608 (Schematic IW, Comp. ....... IO%, IW, Comp ....... 2709, lo%, 1/2W, Comp. ...... 6.65 kR 12, i/Ew, MtF. ...... 4.9 ks7, 1% 1/8w, MtF. ...... IO kR, l%, i/Ew, MtF ....... 680 R, 10% 1/2W, Comp ...... 10 kR, 10% 1/4W, Comp ...... ion. 10%. 1,14W. Camp. ....... (R) Mfr. Desig. 28067D) IRC IRC TEP IRC BEC TEP IRC BEC TEP A-B BEC K-l TEP HARb-900R MAR6-90R TS.SS-9.lC CEA-TO-499 72PMR-IOK TSS-0.91 CEA-TO-40.2 72PHR-IK TSIO-0.102R CB-2R7-10% 72PMR-IO IRC IRC IRC CEA-30.lK-I% CEA-30. IK-I% CEA-30. IK-I% (Schematic A-B A-B OHM A-B A-B A-B IRC IRC IRC A-B A-B A-B Keithley Part No. TS-IOW-III R-236-900 R-236-90 R-237-9.1 ~-88-499 RP-97-10K R-238-.91 ~-88-40.2 RP-97-IK R-239-.102 R-76-2.7 RP-97-10 TF-44 R-221-l 28656E) GB-121-s% ca-121-s% 4565 EB-681-IO% GB-IOI-IO% EB-27l-10% cEA-TO-6.65K CEA-TO-4.99K CEA-TO-IOK EB-681-10% CB-103-10% CB-100:10% R-102-120 R-102-120 R-257-15 R-l-680 R-2-100 R-l-270 R-88-6.65~ R-88-4.99K R-88-IOK R-I-680 R-76-IOK R-76-10 AB I INSTRUCTION MANUAL Dioilal Mulllmeter REPLACEABLE PARTS M;dela172,173 RESISTORS Circuit Desig. Mfr. Code Description "700" R701 R702 R703 R704 R705 R706 R707 R708 R709 R710 Thick Thick StRltS Film Film Resistor Network. Resistor Network. 62n,,lO%, 1/2W, Comp . . . . 5 kR, 0.5W, Var. . . . . . . 500 kR, Potentiometer, 0.5W. 335.3 kR, 0.1%. 1/8w . . . . l ki!, Potentiometer, 0.5W. . 3.280 kn, O.l%, 1/8w, MtF. , 50 Ti, Potentiometer, 0.5W. , 33.2 MR, O-25%, 2W . . . . . "800" R801 R802 R803 ~804 R805 R806 R807 R806 R809 R810 R811 R812 R813 R814 ~815 R816 R817 R818 R81Y R820 1 Part of matched 2.15kR 1 MR, lo%, 1/4W, Comp. "900" RYOI R902 R903 R904 R905 R906 R907 RY08 RYO9 RYIO BA . . . . . . . . . . . . . , . . . . . SERIES set, . . . . . . . . . . EB-620-10% 72PMR-5K 72PMR-500K MAR-6-TlO-0.1% 72PHR-IK MAR6 72PMR-50 MG72l (Schematic BEC BEC no: . . . . . . (Schematic . . . . . . . . , . . . BEC A-B IRC BEC A-B A-B 72PMR-500 72PMR-100 RP-97-500 RP-97-100 CB-105-10% R-76-IH R-243 A-B SERIES R-88-l50K R-241-2.196K RP-97-50 R-76-IOK R-88-68.IK R-88-68.IK R-241-500 R-76-IOM RP-97-IOOK R-88-24.3K R-88-15.8K R-241-500 R-76-3.3K R-243 no: part TF-61 TF-62 R-l-62 RP-97-5K RP-97-500K R-241-335.3K RP-97-IK R-240-3.280K RP-97-50 R-242-33.2H 28656~) CEA-TO-ISOK MAR-6 72PMR-50 CB-IOj-IO% CEA-TO-68.lK CEA-TO-68.lK MAR-6 cB-106-10% 72PMR-IOOK CEA-TO-24.3 CEA-TO-l5.8K MAR-6 CB-332-10% IRC IRC BEC A-B IRC IRC IRC A-B BEC IRC IRC IRC A-B Keithley Part No. 28656~) KI KI A-B BEC BEC TRW BEC IRC BEC CAD ...... 100 R, Potentiometer, 0.5W . IO%, 1/4W, Comp . . . I MR, I%, l/8W, MtF. . . . . 200 kR, Potentiometer, 0.5W. 2.7 0, lo%, 1/4W, Comp . . . I MO, 10%. 1/4W, Comp. . . . NOT USED NOT USED lO.YlKR Part of matched set 99.75Kn Part of matched set 2.7 0, Mfr. Desig. (Schematic I50 kR, I%, 1/8W, MtF. ...... 2.196 kR, O.l%, l/8W, MtF. .... 50 R, Potentiometer, 0.5W. .... IO kR, IO%, l/4W, Comp ...... 68.1 kn, I%, l/EW, MtF ...... 68.1 kR, I%, 1/8w, MtF ...... SOOn, 0.1%. 1/8w, MtF. ...... IOMR, 10%, 1/4W, Comp. ...... 100 kn, Potentiometer, 0.5W. ... 24.3 k0, O.l%,1/8W, MtF. ..... 15.8 KR, I%, 1/8w, MtF. ..... 1/8w, MtF. ..... 500 0, I% 3.3k.Q, 10%,'1/4W, Camp ...... 2Mn Part of matched set, part 19.95kZ 7 500 R, Potentiometer, 0.5W .... .... 100 R, Potentiometer, 0.5W. 2MR, (R) 28656~) CB-2~7-10% RP-97-100 R-76-2.7 CEA-TO-1M 72PHR-200K CB-2R7-10% CB-105-10% R-88-IH RP-Y7-200K R-76-2.7 R-76-1~ 72PMR-100 R-259 R-259 7-21 1 REPLACEABLEPARTS INSTRUCTION MANUAL Digital Multimeler Models 172,173 RESISTORS Circuit %sig. Mfr. Code Description "900" Ryll R912 R913 R914 RY15 R916 R917 RPl8 R919 R920 R921 R322 R923 R924 R925 ~326 RY27 R928 R929 R930 R931 500 0, Potentiometer, I MR. 1%. l/8W. MtF. 200 in, 0.5W . . . Potentiometer. NOT USED 9.75Mn Part of matched IR, I%, 1/2w . . . . . 133k!l, I%, 1/8W, MtF . 49.9 ki,, IS, 1/8w, MtF 49.9 kR, 12, l/8W, MtF 470 R, IO%, 1/4W, Comp . IOkR, I%, l/i 8W. MtF. MtF . 133kn, l%, I. /a;, 27k0, IO%, I, 12W, Comp. 3.3kR, IO%, 1/4W, Comp 3.3k%, IO%, 1/4w, Comp 3.3kG, IO%, 1/4W, Comp I kR, 10%. 150kri, I%, 150k':, I%, 8 w , . . . * 3.3ka, 105, 1/4w, Comp 3.3kn, IO%, 1/4w, Comp 1. SERIES . . . . 0.5w. . . set . . . . . . . . . . . R-259 . . . . . . . . . . . . . . . . . . . . . , . . . . . . * . . . . . . . . . . . . . . . . . . . . "1000" RIOOI R1002 RI003 RI004 RI005 RI006 RI007 RI008 R1009 ~a1010 RlOll a1012 51013 RI014 RIO15 51016 1-22 (R) Resistor Network, Thick Resistor Network, Thick Resistor Network, Thick Resistor Network, Thick Resistor Network, Thick I kR, IO%, 1/4W, Comp. . 32.4 kR, I%, 1/8W, MtF . 1 MI?, lo%, 1/4W, Comp. . 3.9 kR, 102, 1/4W, Comp. 3.9 kR, iOX, 1/4W, Camp. I54 R, I%, l/8W, MtF . . 3.9 kR, IO%, 1/4W, Comp. I54 R, I%, 1/8W, Mtf . . 154 R, I%, 1/8w, MtF.. . 154 R, I%, l/8w, MtF . . IO R, IO%, l/4W, Comp. . Film Film Film Film Film . . . . . . . . . . , . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . Mfr. Desig. Keithley Part No. (Cont'd) BEC IRC BEC 72PMR-500 CEA-TO-IM 72PMR-200K RP-97-500 R-88-IM RP-97-200K IRC IRC IRC I RC A-B IRC IRC A-B A-B A-B A-B DCC-I-I% CEA-TO-133K CEA-TO-49.9K CEA-TO-49.9K CB-IZI-10% CEA-TO-IOK CEA-TO-133K EB-273-10% CB-332-10% CB-332-10% (38-332-104, CB-102-10% CEA-TO-l50K R-12-I R-88-133~ R-88-49.9K R-88-49.9K R-76-470 R-88-IOK R-88-133K R-I-27K R-76-3.3K R-76-3.3K R-76-3.3K R-76-IK R-88-l50K R-247-150K R-76-3.3K f,c" CAD A-B A-B SERIES . K-I . . K-l . . K-l K-l . K-l . . A-B . . IRC . . A-B . . A-B . . A-B . , IRC . . A-B . . IRC . . IRC . . IRC . . A-B ~~-281. 150K CB-332-10; CB-332-10% (Schematic CB-lO2-10% CEA-TO-32.4K CB-lO5-10% CB-392-10% CB-392-10% CEA-TO-154 CB-392-10% CEA-TO-154 CEA-TO-154 CEA-TO-154 CB-IOO-10% R-76-3.3K 27902E) TF-53 TF-53 TF-53 TF-53 TF-53 R-76-IK R-88-32.4K R-76-IM R-76-3.9K R-76-3.9K R-88-154 R-76-3.9K R-88-154 ~-88-154 ~-88-154 R-76-10 BA INSTRUCTION Dlgllsl MANUAL REPLACEABLE Multimeter PARTS Models 172,173 RESISTORS Circuit Desig. Mfr. Code Description "1100" RI101 RI102 RI103 RI104 RI105 RI106 RI107 SERIES (Schematic 11 kR, I%, 25OV, 1/8W . . . . . . Resistor Newwork, Thick Film. . . Resistor Network, Thick Film. . . Resistor Network, Thick Film. . . Resistor Network, Thick Film. . . 6.5 kR, I%, 1/8w. . . . . . . . . 10 kR, I%, l/8W . . . . . . . . . . . . . . . . . . . . . . . SWITCHES Circuit Desig. Switch, Slide, (Modified SERIES DPDT . . . . . . "900" S9Ol . . . . . . . . . . . . . SW-393) (Schematic . . . SERIES . . . . . . . . T60l Power Transformer AB Transformer IRC K-l K-l K-l K-l IRC IRC CEA-TO-6.5KL CEA-TO-IOKG R-88-llK TF-54 TF-54 TF-54 TF-54 R-88-6.5K R-88-IOK' Mfr. Code Mfr. Desig. Keithley Part No. GF326-0006 SW-397 . C-W . K-l Mfr. Code . . . "1000" TIOOI . . . . . . . SERIES . (Schematic . . SERIES . . . . . . . . . . . . 280048 Mfr. Desig. Keithley Part No. 28656E) . . . K-l (Schematic . . . - (T) Description "600" CEA-TO-IIKG 28019E) 27903E) . . . TRANSFORKERS Circuit Desig. Keithley Part No. 28656~) (Schematic . . . Mfr. Desig. (5) Description "600" 5601 (R) TR-163 27902E) . . K-l TR-164 7-23 I REPLACEABLE : PARTS uoo5 Description SERIES Transistor array, I4-pin Flip-Flop, Ill-pin DIP. . Flio-Flop. 14-pin DIP. . Hex Inverter, l6-pin DIP Timing Logic, 8-pin DIP. "100" JIOI 0102 UlO3 Linear Op-Amp,8-Pin Large-Scale Integrated Large-Scale Integrated DIP "Selected . . Circuit Circuit 8-Bit Parallel-Out l4-pin Register, U502 Operational Amplifier, 7-24 28656E) CA3086 9LS74 9LS74 CD404VAE NE555V (Schematic 28656E) IC-53 IC-144 IC-144 IC-106 IC-71 I c-99 LM308PA _-- LSI-5 LSI-4 (Schematic 28656E) . . . RCA ~~3086 . . . NAT LH0042CH SERIES SERIES 8-pin DIP SERIES (Schematic . T-l (Schematic . F-l (Schematic Operational Amplifier, 8-pin DIP . INT COS/MOS BCD-TO-DECIMAL decoder, 16-pin DIP . . . . . . . . . . . RCA "700" U7Ol U702 Keithley Part No. Mfr. Desig. RCA F-l F-l RCA SIG . . . . . . . INT . . K-l . K-l Serial Shift DIP . . . . . "500" u50 I . (U) + 280VOA" IC-132 IC-57 "400" u401 . . . . . SERIES Ill-pin DIP Transistor array Operational Ampl fier, a-pin, TO-5 Case. . . . . . . . . "300" u301 DIP . . . . . . . . . . (Schematic SERIES "200" u201 u202 CIRCUITS Mfr. Code "000" UOOI uoo2 1003 JO04 MANUAL Digilal Mullimeler Models 172.173 INTEGRATED Circuit %sig. INSTRUCTION SERIES (Schematic Operational Amplifier, E-pin DIP : :ii Op-Amp, a-pin, TO-5CaSe * * * . 27404D) ~~74~Sl64 IC-127 26758~) UVT7741393 IC-42 27478D) LM~o~PA I c-93 CD4028AE IC-135 28656E) LM308PA LH0042CH IC-99 JC-132 CB INSTRUCTION Diollal MANUAL REPLACEABLE ~~ INTEGRATED CIRCUITS Circuit Desig. Mfr. Code Operational Amplifier, Operational Amplifier, Analog Amplifier, 8-pin SERIES 8-pin 8-pin DIP "900" ugo I Linear Op-Amp, a-pin DIP. "1000" UlOOl uioo2 UlOO3 UlOO4 UlOO5 I~1006 u1007 1~1008 uioog ulolo UiOll u1012 UlO13 UlOl4 u1015 ~1016 UlOl7 ~1018 u1019 u1020 u1021 AB (U) Description "800" ~802 ~803 PARTS Multlmeler Quad 2-Input Quad Z-Input Quad Z-Input Quad 2-Input Quad t-Input Quad Z-lriput Quad Z-Input COS/MOS Dual Register. COS/MOS Dual Register. COS/MOS Dual Register. COS/MOS Dual Register. Quad 2-Input Quad 2-Input Quad 2-Input Dual D-Type COS/MOS Hex Timing Logic, Optically-coupled Optically-coupled Optically-coupled Optically-coupled (Schematic (Schematic (Schematic AND, 14-pin DIP. . . AND, 14-pin DIP. . . AND, Ill-pin DIP. . . AND, 14-pin DIP. . . AND, 14-pin DIP. . . AND, 14-pin DIP. . . AND, 14-pin DIP. . , 4-Stage Static Shift . . . . . . . . . . . 4-Stage Static Shift . . . . . . . . . . . 4-Stage Static Shift . , . . . , . . . . . 4-Stage Static Shift . . . . . . . . . . . AND, 14-pin DIP. . . AND, 14-pin DIP. , . NOR, 14-pin DIP. . Flip-Flop, 14-pin DIP Inverter, 14-pin DIP. 8-pin DIP . . Isolator, i-bin Isolator, 8-pin Isolator, E-pin Isolator, 8-pin . . . . . . . LH30lAN LH301AN LF356H It-24 IC-24 IC-152 LM308PA I c-39 IC-138 IC-138 28656E) . . . . . . . . . NAT SERIES Keithley Part No. 28656E) DIP. . . . NAT DIP. . : : . . NAT . . . . . . . . NAT SERIES Mfr. Desig. 27902E) , . . . . . . . . . . . , . . . . . . . . RCA RCA RCA RCA RCA RCA RCA CD408lBE CD408lBE c04081B~ CD4081BE CD408lBE CD408lBE CD4081BE ;;I;;; . . . . RCA CD4015AE IC-136 . . . . RCA CD4015AE IC-136 , . . . RCA CD4015AE It-136 . . , . . . . . . . . . . . . . . CD408lBE CD4081BE CD4081BE CD400lAE CD4013AE CD4069BE NE555'J HP5082-4351 HP5082-4351 HP5082-4351 HP5082-4351 IC-136 IC-138 IC-138 IC-I08 IC-103 IC-139 IC-71 IC-142 IC-142 IC-142 IC-142 . , , . . . bib DIP DIP DIP . . . . . . . * . . . RCA RCA RCA RCA RCA RCA SIG H-P H-P H-P H-P IC-138 It- I38 IC-138 7-25 I REPLACEABLE PARTS INSTRUCTION MANUAL Digllal Mullimeler Models 172.173 INTEGRATED Circuit Desig. u1105 UllO6 u1107 U1108 ulloy Ull IO Ullll (U) Mfr. Code Description "1100" UllOl u1102 UllO3 u1104 CIRCUITS SERIES (Schematic Hex Inverters, Open Collector Output.. Hex Inverters, Open Collector Output.. Hex Inverters, Open Collector Output.. Positive-NAND Gates and Inverters/ Totem-pole outputs . . . . . Hex Inverters, Open Collector Output Dual D-Type Flip-Flop, 14-pin DIP. Quad Z-Input NOR, lb-pin DIP . . . . COS/MOS 8-Stage Static Shift Register . . . . . . . . . . . . . Quad 2-Input AND, 14-pin DIP . . , . COS/tlOS Dual 4 Input NAND Gates. . . Six COS/MOS Hex lnvertec . . . . . . . . . nrr. Desig. Keithley Part No. 28019~) . . TEXAS . . TEXAS . . TEXAS SN74LS05N SN74LS05N SN74LSOSN IC-141 IC-141 IC-141 . SN74LSl'iN SN74LS05N CD4013AE CD4001AE IC-137 IC-ikl IC-103 IC-I08 CD402lAE CD408lBE CD4012AE CD4069BE IC-I30 It-138 IC-I40 IC-139 MFR. Desig. Keithley Part No. IN960B IN827A DZ-55 Dz-48 IN963B DZ-54 LM340LAZ-8.0 UGH7805393 RC4195TK IC-164 28515A It-128 lN963B 02-54 TEXAS . TEXAS . . RCA . RCA , . . RCA . . . RCA . . RCA . . . RCA VOLTAGE REGULATORS ('JR) Circuit Desig. rlfr. Code Description "100" VRlOl VRl02 Zener, Zener, 9.1V. 6.2V, 400mW . . 1/4W. . . SERIES . . . "200" VR201 VR202 VR203 Zener, Zener, Zener, VR601 VR602 'JR603 Voltage Regulator, Regulator, SERIES '.-IL Zener, 28656~) 280408 . (Schematic DIG 28656E) Regulator, +8~, Case TO-92 . . . . NAT 5v, Case TO-220 (IC-93). . . . . F-l +15V, TO-66 Case . . . . . . . . RAY "800" VR80 1 (Schematic matched set set 280406 . "600" 28656E) . . . . . DIC . . . . . . . DIC SERIES 6.2V, 1/4W - Part of 3V - Part of matched l2V, 400mV . . (Schematic 12V, 400mW . . . . SERIES . (Schematic . . . . . . 28656E) . . DIC . INSTRUCTION Dlgltal Models REPLACEABLE MANUAL PARTS Multimeter 172,173 JUMPERS (W) Circuit Desig. Mfr. Code Description "200" SERIES "500" SERIES 1'600io SERIES w601 ~801 (Schematic (SCHEMATIC (Used only on Model 173) SERIES (Schematic K-1 J-3 28656~) J-3 (SCHEMATIC K-l "900" AB --- 28656~) K-i 1180011SERIES Keithley Part No. 28656~) K-l w501 WPOI (Schematic K-, w201 Mfr. Desig. J-3 28656~) __ J-3 28656E) Y- WIRE 7-27 ~REPLACEABLEPARTS’ INSTRUCTION MANUAL Digital Multimeter Models 172.173 MISCELLANEOUS KEITHLEY PART NO. DESCRIPTION Top Cover (less metalcal) 1 1 Hetalcal for Bottom (less . . Cover Metalcal, . . NC-236 25727E metalcals) rear (less Insert cover operating . Metalcal, Handle top 27979c instruction5 panel MC-2j5 insert) 25729D (2 req'd) Spacer (1( req'd) Rubber foot (4 MC-239 260POA 257628 req'd) FE-IO Front Panel - Model I72 2802PA Front Panel - Model 173 27958A "C" Ring (Used to hold display board) ~A-18 . INSTRUCTION MANUAL REPLACEABLEPARTS Digltel Mullimeler Models 172. I73 TABLE 7-2 COMPONENT DESIGNATIONS (See / I 1 Circuit / Desig. Figure (MODEL 173) 43.) I Location Code COOI I coo2 coo3 coo4 coo5 co06 coo7 co08 G-27 G-27 K-26 M-26 ~-25 s-29 u-29 T-26 U-27 COOP AB FOR PC-407 Cl01 Cl02 Cl03 Cl04 Cl05 cl06 Cl07 Cl08 Cl09 Cl10 Clll Cl12 Cl13 Cl14 Cl15 G-26 H-22 F-18 G-18 H-18 ~-23 'K-22 L-21 K-19 M-24 P-26 Q-22 o-22 a-20 T-20 c201 c202 C203 C204 c205 C206 C207 ~208 c209 c210 Y-19 a-23 a-20 a-21 a-18 a-17 c-18 d-17 e-21 f-24 ~601 C602 C603 c604 C605 C606 C607 C608 C609 C610 B-28 B-26 D-25 L-15 F-13 J-13 J-II L-IO L-10 ~-8 - Circuit Desig. Location Code Circuit Desig. , Location Code ~611 ~612 C7Ol C702 J-2 l-14 T-14 z-15 I ! ~801 ~802 ~803 ~804 C805 ~806 ~807 c808 ~809 ~810 ~811 C812 C813 C814 C815 C816 C817 C818 ~819 C820 C82l P-10 N-8 Q-9 CR207 CR208 CR209 CR210 CR211 CR212 CR213 CR214 y-23 b-23 c-23 c-23 d-23 d-23 H-33 W-18 _.~~ C9Ol $02 c903 c904 c905 ~306 c907 ~908 C903 (NS) R-P N-7 N-5 R-8 R-5 S-5 P-2 u-7 v-8 v-7 T-3 X-IO x-5 Y-5 x-3 Z-6 f-5 f-4 V-II D-19 f-14 g-14 g-12 CR601 CR602 J-8 J-5 CR701 CR702 CR703 CR704 CR705 P-14 P-13 s-13 Y-13 e-16 ~~801 ~~802 CR803 ~~804 Q-5 v-5 a-2 b-2 CR301 CR902 CR903 CR904 CRY05 DS601 w-9 I g-9 h-19 m-23 m-24 p-30 F6Ol c-16 J2Ol b-30 9-J I~801 u-6 9-3 IK90l I'101 I~601 I3602 I'603 I~604 I'605 I3606 K-9 e-25 H-31 B-16 K-7 K-4 g-31 k-31 Ip901 IP902 k-l p-1 h-6 CVIO (NS) k-26 h-24 CR001 CR002 CR003 CR201 CR202 CR203 CR204 CR205 ~~206 J-26 L-26 w-30 u-19 v-17 v-19 v-18 w-21 Y-17 - i I 7-29 REPLACEABLE PARTS INSTRUCTION MANUAL Digital Multimeler Models 172.173 Component Circuit Desig. ! ; H-25 R-25 v-29 QIOI QlO.2 Q103 QlO4 Q105 QlO6 Q107 QlO8 PI09 QllO Qll I Q112 Ql I3 F-19 H-21 J-22 J-21 ~-24 L-23 L-21 M-22 M-21 S-23 s-22 s-21 s-20 QZOI Q202 Q203 Q204 Q205 Q206 Q207 ~208 Q209 Q210 Q-211 Q212 4213 ~214 L-20 s-18 s-17 T-18 T-17 x-19 x-17 Y-19 b-22 b-20 d-21 d-20 d-19 f-22 f-21 h-22 Q70l 4702 Q703 Q704 ::2 Q707 Q7o8 Q709 Q710 PC-407 ILocation Code QOOI QOOZ Qoo3 $6' TABLE 7-2 (continued) Designations For p-16 P-15 i Circuit Desig. Q80l P-9 N-6 P-4 r$:; ~804 Q805 Q-V Q90l Q902 o303 V-IO e-9 f-10 ROOI R002 R003 R004 R005 R006 R007 R008 ROOY ROIO ROII ROl2 ROl3 H-27 J-27 51-27 ~-27 S-26 s-30 T-30 s-29 u-30 v-29 x-30 Y-29 T-27 RIOI RI02 R103 RI04 RI05 RI06 RI07 RI08 RIO9 RI10 Rlll R112 RI13 RI14 H-27 ~-25 F-23 F-21 F-18 H-20 G-19 H-18 H-17 T-23 x-26 X-27 2-26 Z-27 R201 R202 R203 R204 R205 ~206 R207 ~208 K-17 L-19 ~-18 M-18 M-18 N-18 p-18 P-19 ;r;; P-12 Q-12 x-14 2-14 a-14 b-15 Location Code b-3 Circuit Desig. Location Code R209 R2lO R2ll R212 R213 R214 R215 R216 R217 ~218 R2lY R220 R22l R222 R223 R224 R225 R226 R227 (NS) ~228 R229 R230 R23l R-19 Q-18 U-24 u-21 U-23 u-18 W-24 v-21 v-20 w-18 Y-21 x-18 2-23 z-18 b-24 b-22 b-18 d-18 d-20 e-17 g-24 g-22 e-28 R60l ~602 R603 ~604 R605 R606 R607 R608 R609 R6IO(NS) Rbll R612 R613 R701 R702 R703 R704 R705 R706 R7o7 R708 R709 R7lO B-30 B-31 c-30 D-31 E-30 D-27 L-4 L-4 M-4 k-28 p-26 M-IO M-Y N-15 P-13 R-13 u-16 v-16 u-15 u-13 v-15 w-14 y-16 AB I INSTRUCTION REPLACEABLEPARTS MANUAL Dlgllal MultImeter Models 172, 173 TABLE 7-2 (continued) For Component Designations Circuit Desig. R807 R808 R809 R810 R81l R812 R813 R814 R815 R816 R817 R818 R819 ~820 R90l R902 R903 Rg04 R905 R906 R907 R908 1 R-4 R-3 R-2 T-6 T-6 T-5 x-9 v-8 W-5 v-4 w-2 b-4 z-2 c-2 u-12 T-II u-11 T-9 U-IO u-9 NOT USED NOT USED RVOV R9lO RYII RVl2 RYl3 R914 R915 R916 R917 R9l8 R919 R920 R92l R922 R923 R924 R925 R926 AB NOT USED b-8 c-7 d-12 e-12 e-11 e-10 f-12 f-II 9-5 &I 8 f-19 f-18 Location Code Circuit Desig. R927 (NS) k-17 R928 (NS) R929 (NS) g-15 E-28 E-28 D-27 D-27 L-9 c-5 R930 R93l n-16 p-20 p-20 iJ603 w604 W605 4606 W607 ~601 B-20 ti801 T601 TPlOl TP102 D-7 M-23 ~-24 UOOI uoo2 uoo3 uoo4 uoo5 ~-28 N-27 Q-29 U-28 U-26 UlOl H-20 P-24 a-26 Iu102 Iill03 IJ2Ol ILIZ02 IJ701 IJ702 ( Location Code f-19 W-23 x-20 s-15 b-13 JVOI d-14 x-29 F-26 G-21 ‘:/ROOl 1JR101 ,JR102 1JR201 ,JR202 IilR203 - PC-407 L-IV N-18 Z-23 1JR601 \1~602 \/R603 B-25 F-16 L-13 \IR80l Y-9 \J201 p-18 I~601 \~602 D-29 D-29 i J - 1 7-31 I I I I 3 I I I t I . r I - I I -15”j 1 I I I! CR410 r I I I I : I i I i - I I I - - - K - I I- L 3 - I\ m - 0 cl - m n 0 I I - c - L - - TI L 5 J Y -J c - -I - Y - -2 - ~ - D - m - n - Q - m - n - G) - I - x - r - 3 - Z - -u - 0 - x - v) - -4 - c < --s - x - < N (u - m - 0 - a m -