Download Fluke 45

Table of Contents
Chapter
1
Title
Introduction and Specifications ........................................................... 1-1
1-1.
1-2.
1-3.
1-4.
1-5.
1-6.
2
Page
Introduction ............................................................................................
Operating Instructions.............................................................................
Options and Accessories .........................................................................
Organization of the Service Manual .......................................................
Conventions ............................................................................................
Specifications..........................................................................................
1-3
1-3
1-3
1-4
1-5
1-6
Theory of Operation .............................................................................. 2-1
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
2-9.
2-10.
2-11.
2-12.
2-13.
2-14.
2-15.
2-16.
2-17.
2-18.
2-19.
2-20.
2-21.
2-22.
2-23.
2-24.
2-25.
Introduction ............................................................................................
Functional Block Description .................................................................
Power Supply .....................................................................................
Analog Measurement Processor .........................................................
Input Protection Circuit ......................................................................
Input Signal Conditioning ..................................................................
Analog-to-Digital (A/D) Converter ....................................................
Serial Communication (Guard Crossing) ...........................................
Digital Kernel .....................................................................................
Display Assembly...............................................................................
IEEE-488 Interface Option (-05)........................................................
Battery Pack Option (-01) ..................................................................
Detailed Circuit Description ...................................................................
Power Supply Circuit Description ......................................................
Raw DC Supply .............................................................................
5-Volt Switching Supply................................................................
Inverter...........................................................................................
Analog Measurement Processor .........................................................
Input Protection ..................................................................................
Input Signal Conditioning ..................................................................
Relays.............................................................................................
DC Volts ........................................................................................
Ohms ..............................................................................................
100 MΩ and 300 MΩ Ranges ........................................................
AC Volts ........................................................................................
i
2-3
2-3
2-3
2-3
2-3
2-3
2-3
2-3
2-5
2-5
2-5
2-5
2-5
2-5
2-6
2-6
2-7
2-7
2-10
2-10
2-11
2-12
2-12
2-14
2-14