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Table of Contents

Chapter Title Page

1 Introduction and Specifications ........................................................ 1-1

1-1. Introduction........................................................................................... 1-3

1-2. Operating Instructions .......................................................................... 1-3

1-3. Options and Accessories....................................................................... 1-3

1-4. Organization of the Service Manual..................................................... 1-4

1-5. Conventions.......................................................................................... 1-5

1-6. Specifications........................................................................................ 1-6

2 Theory of Operation ........................................................................... 2-1

2-1. Introduction........................................................................................... 2-3

2-2. Functional Block Description............................................................... 2-3

2-3. Power Supply.................................................................................... 2-3

2-4. Analog Measurement Processor....................................................... 2-3

2-5. Input Protection Circuit.................................................................... 2-3

2-6. Input Signal Conditioning ................................................................ 2-3

2-7. Analog-to-Digital (A/D) Converter.................................................. 2-3

2-8. Serial Communication (Guard Crossing)......................................... 2-3

2-9. Digital Kernel................................................................................... 2-5

2-10. Display Assembly............................................................................. 2-5

2-11. IEEE-488 Interface Option (-05)...................................................... 2-5

2-12. Battery Pack Option (-01) ................................................................ 2-5

2-13. Detailed Circuit Description................................................................. 2-5

2-14. Power Supply Circuit Description.................................................... 2-5

2-15. Raw DC Supply............................................................................ 2-6

2-16. 5-Volt Switching Supply.............................................................. 2-6

2-17. Inverter......................................................................................... 2-7

2-18. Analog Measurement Processor....................................................... 2-7

2-19. Input Protection................................................................................ 2-10

2-20. Input Signal Conditioning ................................................................ 2-10

2-21. Relays........................................................................................... 2-11

2-22. DC Volts ...................................................................................... 2-12

2-23. Ohms............................................................................................ 2-12

2-24. 100 MΩ and 300 MΩ Ranges...................................................... 2-14

2-25. AC Volts ...................................................................................... 2-14

Fluke 45 Service Manual

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