Keithley 2701, Service Manual

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Comprehensive calibration ......................................................... 2-5
Calibration cycle .................................................................. 2-5
Recommended equipment ................................................... 2-5
Aborting calibration ............................................................ 2-6
Front panel calibration ........................................................ 2-6
Remote calibration ............................................................ 2-13
Manufacturing calibration ........................................................ 2-19
Recommended test equipment .......................................... 2-19
Calibration card preparation .............................................. 2-19
Unlocking manufacturing calibration ................................ 2-19
Measuring function generator signal amplitude ................ 2-20
Front panel manufacturing calibration .............................. 2-20
Remote manufacturing calibration .................................... 2-21
Model 7700 calibration ............................................................. 2-22
Recommended test equipment .......................................... 2-22
Calibration card connections ............................................. 2-22
Model 7700 calibration ..................................................... 2-22
3 Routine Maintenance
Introduction ................................................................................ 3-2
Setting the line voltage and replacing the line fuse .................... 3-2
Replacing the front terminal AMPS fuse .................................... 3-4
Replacing Model 7700 plug-in module amps fuses ................... 3-5
Replacing non-volatile RAM battery ......................................... 3-6
Plug-in module relay closure count ............................................ 3-7
Closure count commands .................................................... 3-7
Reading relay closure count ................................................ 3-7
Resetting relay closure count .............................................. 3-8
Setting count update interval ............................................... 3-8
4 Troubleshooting
Introduction ................................................................................ 4-2
Repair considerations ................................................................. 4-2
Power-on self-tests ...................................................................... 4-3
RAM and EPROM tests ...................................................... 4-3
Flash memory tests .............................................................. 4-3
Front panel tests .......................................................................... 4-4
KEY test .............................................................................. 4-4
DISP test .............................................................................. 4-4
Principles of operation ................................................................ 4-5
Power supply ....................................................................... 4-5
Display board ...................................................................... 4-6
Digital circuitry ................................................................... 4-8
Analog circuitry ................................................................. 4-10