Fluke 41B - SERVICE CENTERS

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Table of Contents
Chapter Title Page
1 Introduction and Specifications........................................................ 1-1
1-1. Introduction .......................................................................................... 1-3
1-2. Organization of the Service Manual..................................................... 1-3
1-3. Conventions.......................................................................................... 1-4
1-4. General Information ............................................................................. 1-4
1-5. Description....................................................................................... 1-4
1-6. Power Requirements ........................................................................ 1-4
1-7. Options, Accessories and Related Equipment.................................. 1-4
1-8. Operating Instructions...................................................................... 1-5
1-9. Specifications ....................................................................................... 1-5
2 Theory of Operation........................................................................... 2-1
2-1. Introduction .......................................................................................... 2-3
2-2. Functional Block Description............................................................... 2-3
2-3. Circuit Operation.................................................................................. 2-5
2-4. Power-Up Sequence......................................................................... 2-5
2-5. Normal Operation ............................................................................ 2-6
2-6. Circuit Descriptions.............................................................................. 2-6
2-7. Power Supplies................................................................................. 2-6
2-8. Power-On Circuit......................................................................... 2-6
2-9. VCC............................................................................................. 2-6
2-10. -22 Volts ...................................................................................... 2-7
2-11. VEE.............................................................................................. 2-7
2-12. VDD............................................................................................. 2-7
2-13. VSS.............................................................................................. 2-7
2-14. VREF........................................................................................... 2-7
2-15. Low Battery Detection................................................................. 2-8
2-16. Power Reset ................................................................................. 2-8
2-17. Input Conditioning........................................................................... 2-8
2-18. Difference Amplifier (Voltage Input).......................................... 2-8
2-19. Protection Circuit (Current Channel)........................................... 2-8
2-20. Gain Amplifier............................................................................. 2-8
2-21. Latch (U1).................................................................................... 2-8
2-22. Anti-Alias Filter........................................................................... 2-9