Fluke 867B Service Manual

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Table of Contents
Chapter Title Page
1 Introduction and Specifications .......................................................................................... 1-1
1-1.. Introduction ............................................................................................................. 1-3
1-2. Description .............................................................................................................. 1-3
1-3. Power Requirements ............................................................................................... 1-3
1-4. Options, Accessories and Related Equipment ....................................................... 1-4
1-5. Operating Instructions ............................................................................................ 1-4
1-6. Obtaining Service ................................................................................................... 1-4
1-7. Conventions Used in This Manual ......................................................................... 1-5
1-8. Chapter Contents .................................................................................................... 1-5
1-9. Specifications .......................................................................................................... 1-6
2 Theory of Operation............................................................................................................. 2-1
2-1. Introduction ............................................................................................................. 2-3
2-2. Start-Up Sequence .................................................................................................. 2-3
2-3. Function Selection .................................................................................................. 2-3
2-4. Power Supply .......................................................................................................... 2-4
2-5. Power Supply Input Voltages ................................................................................. 2-4
2-6. Power Supply Output Voltages and Currents ........................................................ 2-6
2-7. Power Supply Signals ............................................................................................ 2-7
2-8. Power ON/OFF Requirements ............................................................................... 2-8
2-9. NiCd Charging Requirements ................................................................................ 2-8
2-10. Battery and Line Level Detection .......................................................................... 2-8
2-11. Power Supply Functional Blocks ........................................................................... 2-9
2-12. Input Power Selector (A) ........................................................................................ 2-9
2-13. Boost Preregulator (B) ............................................................................................ 2-10
2-14. Battery Charger (C) ................................................................................................ 2-10
2-15. DC-DC Converter (D) ............................................................................................ 2-12
2-16. Backlight Current Sink (E) ..................................................................................... 2-12
2-17. Power Switch Circuitry (F) .................................................................................... 2-12
2-18. LCD Contrast Control (G) ...................................................................................... 2-12
2-19. Power-On Reset Circuit (H) ................................................................................... 2-12
2-20. Linear Post Regulators (I) ....................................................................................... 2-13
2-21. Input Overload Protection ...................................................................................... 2-13

Fluke 867B Specifications

General

True RMS	Yes
Diode Test	Yes
Continuity Check	Yes
Safety Rating	CAT III 1000 V, CAT IV 600 V
Max Voltage AC/DC	1000 V
Max Current AC/DC	10 A
Battery Life	200 hours