Fluke 45 Service Manual

45
Service Manual
ii
2-26. DCmA.......................................................................................... 2-15
2-27. ACmA.......................................................................................... 2-15
2-28. Amps............................................................................................ 2-15
2-29. Diode/Continuity Test.................................................................. 2-15
2-30. Frequency..................................................................................... 2-15
2-31. Active Filter...................................................................................... 2-16
2-32. A/D Converter.................................................................................. 2-17
2-33. Serial Communication (Guard Crossing)......................................... 2-18
2-34. Digital Kernel................................................................................... 2-18
2-35. RS-232 Interface .......................................................................... 2-19
2-36. Microprocessor ............................................................................ 2-19
2-37. EEROM........................................................................................ 2-19
2-38. RAM............................................................................................. 2-20
2-39. ROM............................................................................................. 2-20
2-40. IEEE-488 Option Connections..................................................... 2-20
2-41. Display Assembly............................................................................. 2-20
2-42. Main Assembly Connector........................................................... 2-20
2-43. Front Panel Switches.................................................................... 2-20
2-44. Display ......................................................................................... 2-21
2-45. Beeper Drive Circuit.................................................................... 2-21
2-46. Watchdog Timer and Reset Circuit.............................................. 2-21
2-47. Display Controller with FIP......................................................... 2-22
3 General Maintenance ......................................................................... 3-1
3-1. Introduction........................................................................................... 3-3
3-2. Warranty Repairs and Shipping Information........................................ 3-3
3-3. General Maintenance Information........................................................ 3-3
3-4. Required Equipment......................................................................... 3-3
3-5. Power Requirements......................................................................... 3-3
3-6. Static Safe Handling......................................................................... 3-3
3-7. Cleaning................................................................................................ 3-4
3-8. Fuse Test and Replacement .................................................................. 3-4
3-9. Line Fuse.......................................................................................... 3-4
3-10. Current Input Fuses .......................................................................... 3-4
3-11. Testing Current Input Fuses......................................................... 3-4
3-12. Replacing the 500 mA and 440 mA Input Fuses (F1 and F5)...... 3-5
3-13. Replacing the 10 A Input Jack Fuse (F2)..................................... 3-6
3-14. Disassembly Procedures....................................................................... 3-7
3-15. Remove the Meter Case.................................................................... 3-7
3-16. Remove Handle and Mounting Brackets.......................................... 3-7
3-17. Remove the Front Panel Assembly .................................................. 3-8
3-18. Remove the Display PCA................................................................. 3-8
3-19. Remove the IEEE-488 Option.......................................................... 3-9
3-20. Remove the Main PCA..................................................................... 3-9
3-21. Remove the Analog Measurement Processor Shields...................... 3-9
3-22. Remove the Rms PCA...................................................................... 3-10
3-23. Remove the Battery Option.............................................................. 3-10
3-24. Disconnect Miscellaneous Chassis Components ............................. 3-10
3-25. Assembly Procedures............................................................................ 3-10
3-26. Install Miscellaneous Chassis Components ..................................... 3-10
3-27. Install the Battery Option ................................................................. 3-11
3-28. Install the Rms PCA......................................................................... 3-11
3-29. Install the Analog Measurement Processor Shields......................... 3-11
3-30. Install the Main PCA........................................................................ 3-11

Fluke 45 Specifications

General

Diode Test	Yes
Display Digits	5 digits
Interface	RS-232
Frequency Range	5Hz to 500kHz
Continuity	< 25 Ω
Basic DC Accuracy	0.05%
Power Supply	115/230 V AC, 50/60 Hz