Download Model 1005

Testing Resistance, Diode, and Continuity
Testing Frequency, Duty Cycle, or Pulse Width
Use this menu option to test resistance, diode forward voltage, and the continuity of wiring and connections. Connect
the test lead tip and test lead ground across the object to be tested.
GRAPHING MULTIMETER
GMM OHM
FREQUENCY
CONTINUTY
OPEN
CLOSE
OHM
Press to measure
resistance.
DUTY CYCLE
PULSE WIDTH
Press to test diodes.
Press to test continuity of wiring and
connections.
If you select OPEN, the instrument beeps
when the tested connection is open.
If you select CLOSE, it beeps when the
tested connection is closed.
OFL is displayed when the resistance is outside the instrument’s maximum range. This occurs when the resistance
of the sensor is too high or the connection to the sensor is interrupted or open.
GMM FREQUENCY
GMM DUTY CYCLE
%
ms
Hz
GMM PULSE WIDTH
%
ms
Hz
Press to test the signal
frequency in Hz.
P ress t o test the dut y cycle of the
signal.
If you select , the duty cycle of the
negative-going pulse is displayed.
If you select , the duty cycle of the
positive-going pulse is displayed.
To test a diode, the instrument sends a small current through the diode to test the voltage across it. Depending on
the type of diode, this voltage should be in the range from 300 to 600 mV. A diode that has an internal short will
display about 0 V. OFL is displayed when the diode is defective or when it is connected in reverse. If you are not
certain about the polarity of the diode, try the reverse connection. If this also displays OFL, the diode is defective. A
good diode must display OFL when connected in reverse.
%
ms
Hz
Press to test the pulse width of the
signal.
If you select , the width of the
negative-going pulse is displayed.
If you select , the width of the
positive-going pulse is displayed.
Testing Secondary Ignition Peak Volts, Burn Volts, and Burn Time
Measuring RPM
The instrument automatically scales and displays the waveform on the screen. Connect the Inductive Pickup to the
COM/TRIGGER input terminals and clamp the pickup probe on the spark plug wire close to the spark plug.
GRAPHING MULTIMETER
GMM RPM
Press to adjust the built-in
4 step trigger levels.
Default is Level 2.
Press to decrease.
RPM TRIG
2
IGNITION PEAK VOLTS
n
1 720
DEFAULT
SETUP
REPEAT
TEST
IGNITION BURN VOLTS
Press to start plotting a new graph
as new samples are acquired.
IGNITION BURN TIME
Press to restore the default value
settings stored in VEHICLE DATA.
Press to increase.
GMM IGNITION PEAK VOLTS
INVERT
OFF
REPEAT
TEST
MAX/MIN
RESET
GMM IGNITION BURN VOLTS
INVERT
OFF
REPEAT
TEST
MAX/MIN
RESET
GMM IGNITION BURN TIME
INVERT
OFF
REPEAT
TEST
MAX/MIN
RESET
and
keys are used to set the number of Spark Signal Pulses to the instrument per 720 (two crank shaft
revolutions). n = 1, 2, 3, 4, 5, 6, 8, 10, or 12
Press to invert the displayed ignition
waveform.
5-10
5-11