Fluke 5520A - Page 6

5520A
Service Manual
ii
2 Theory of Operation ........................................................................... 2-1
2-1. Introduction........................................................................................... 2-3
2-2. Encoder Assembly (A2)........................................................................ 2-4
2-3. Synthesized Impedance Assembly (A5)............................................... 2-4
2-4. DDS Assembly (A6)............................................................................. 2-5
2-5. Current Assembly (A7)......................................................................... 2-6
2-6. Voltage Assembly (A8) ........................................................................ 2-7
2-7. Main CPU Assembly (A9).................................................................... 2-8
2-8. Power Supplies ..................................................................................... 2-8
2-9. Outguard Supplies ............................................................................ 2-8
2-10. Inguard Supplies............................................................................... 2-8
3 Calibration and Verification............................................................... 3-1
3-1. Introduction........................................................................................... 3-3
3-2. Equipment Required for Calibration and Verification.......................... 3-3
3-3. Calibration ............................................................................................ 3-5
3-4. Starting Calibration .......................................................................... 3-5
3-5. DC Volts Calibration (NORMAL Output)....................................... 3-6
3-6. DC Volts Calibration (30 Vdc and Above) ...................................... 3-7
3-7. AC Volts Calibration (NORMAL Output)....................................... 3-8
3-8. Thermocouple Function Calibration................................................. 3-10
3-9. DC Current Calibration .................................................................... 3-11
3-10. AC Current Calibration .................................................................... 3-14
3-11. DC Volts Calibration (AUX Output)................................................ 3-20
3-12. AC Volts Calibration (AUX Output)................................................ 3-20
3-13. Resistance Calibration...................................................................... 3-21
3-14. Capacitance Calibration.................................................................... 3-24
3-15. Calibration Remote Commands............................................................ 3-27
3-16. Generating a Calibration Report........................................................... 3-33
3-17. Performance Verification Tests ............................................................ 3-34
3-18. Zeroing the Calibrator ...................................................................... 3-34
3-19. Verifying DC Volts (NORMAL Output) ......................................... 3-35
3-20. Verifying DC Volts (AUX Output).................................................. 3-36
3-21. Verifying DC Current....................................................................... 3-36
3-22. Verifying Resistance ........................................................................ 3-38
3-23. Verifying AC Voltage (NORMAL Output) ..................................... 3-40
3-24. Verifying AC Voltage (AUX Output).............................................. 3-42
3-25. Verifying AC Current....................................................................... 3-43
3-26. Verifying Capacitance...................................................................... 3-46
3-27. 200 µF to 110 mF Capacitance Verification .................................... 3-47
3-28. Capacitance Measurement................................................................ 3-47
3-29. Measurement Uncertainty................................................................. 3-51
3-30. Verifying Thermocouple Simulation (Sourcing).............................. 3-52
3-31. Verifying Thermocouple Measurement............................................ 3-52
3-32. Verifying Phase Accuracy, Volts and AUX Volts ........................... 3-53
3-33. Verifying Phase Accuracy, Volts and Current ................................. 3-54
3-34. Verifying Frequency Accuracy ........................................................ 3-55
4 Maintenance........................................................................................ 4-1
4-1. Introduction........................................................................................... 4-3
4-2. Access Procedures ................................................................................ 4-3
4-3. Removing Analog Modules.............................................................. 4-3
4-4. Removing the Main CPU (A9)......................................................... 4-3