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8842A
Instruction Manual
iv
5-15. OHMS CURRENT SOURCE .............................................................. 5-12
5-16. OHMS PROTECTION......................................................................... 5-13
5-17. OHMS FUNCTIONS........................................................................... 5-13
5-18. 2-Wire Ohms.................................................................................... 5-13
5-19. 4-Wire Ohms.................................................................................... 5-15
5-20. A/D CONVERTER .............................................................................. 5-15
5-21. Timing/Data Control........................................................................ 5-17
5-22. Precision DAC ................................................................................. 5-18
5-23. A/D Amplifier.................................................................................. 5-18
5-24. Bootstrap Supplies ........................................................................... 5-18
5-25. DISPLAY ............................................................................................. 5-19
5-26. KEYBOARD........................................................................................ 5-19
5-27. DIGITAL CONTROLLER................................................................... 5-19
5-28. In-Guard Microcomputer ................................................................. 5-21
5-29. Function and Range Control ............................................................ 5-23
5-30. A/D Control and Computation......................................................... 5-23
5-31. Calibration Correction...................................................................... 5-23
5-32. Keyboard/Display Control ............................................................... 5-24
5-33. Troubleshooting Modes ................................................................... 5-24
5-34. Guard-Crossing Communication ..................................................... 5-24
5-35. GUARD CROSSING ........................................................................... 5-24
5-36. POWER SUPPLY ................................................................................ 5-25
5-37. IEEE-488 INTERFACE (OPTION -05)............................................... 5-26
5-38. Out-Guard Microcomputer............................................................... 5-26
5-39. Guard Crossing................................................................................. 5-26
5-40. Bus Interface Circuitry..................................................................... 5-26
5-41. Signal Conditioning ......................................................................... 5-27
5-42. IEEE-488 Interface Power Supply................................................... 5-27
5-43. TRUE RMS AC (OPTION -09)........................................................... 5-27
5-44. VAC Scaling .................................................................................... 5-27
5-45. mA AC Scaling................................................................................ 5-28
5-46. Frequency Response Trimming ....................................................... 5-28
5-47. True RMS AC-to-DC Conversion ................................................... 5-28
6 Maintenance....................................................................................... 6-1
6-1. INTRODUCTION................................................................................ 6-3
6-2. PERFORMANCE TEST...................................................................... 6-4
6-3. Diagnostic Self-Tests ....................................................................... 6-4
6-4. DC Voltage Test............................................................................... 6-5
6-5. AC Voltage Test (Option -09 Only)................................................. 6-7
6-6. Resistance Test................................................................................. 6-8
6-7. DC Current Test............................................................................... 6-9
6-8. AC Current Test (Option -09 Only)................................................. 6-10
6-9. CALIBRATION................................................................................... 6-10
6-10. Basic Calibration Procedure............................................................. 6-11
6-11. INITIAL PROCEDURE.............................................................. 6-11
6-12. A/D CALIBRATION .................................................................. 6-12
6-13. OFFSET AND GAIN CALIBRATION ...................................... 6-14
6-14. HIGH-FREQUENCY AC CALIBRATION................................ 6-15
6-15. Advanced Features and Special Considerations............................... 6-16
6-16. STORING VARIABLE INPUTS................................................ 6-16
6-17. CALIBRATING INDIVIDUAL RANGES................................. 6-17
6-18. VERIFYING CALIBRATION.................................................... 6-17
6-19. ERASING CALIBRATION MEMORY..................................... 6-18