Changing the password ............................................................... 2-5
Changing the password from the front panel ...................... 2-6
Changing the password by remote ...................................... 2-6
Resetting the calibration password ............................................. 2-6
Viewing calibration dates and calibration count ........................ 2-7
Calibration errors ........................................................................ 2-7
Front panel error reporting .................................................. 2-7
Remote error reporting ........................................................ 2-7
Front panel calibration ................................................................ 2-7
Remote calibration .................................................................... 2-15
Remote calibration commands .......................................... 2-15
Recommended calibration parameters .............................. 2-16
Remote calibration procedure ........................................... 2-18
Single-range calibration ............................................................ 2-23
3 Routine Maintenance
Introduction ................................................................................ 3-2
Line fuse replacement ................................................................. 3-2
4 Troubleshooting
Introduction ................................................................................ 4-2
Safety considerations .................................................................. 4-2
Repair considerations ................................................................. 4-2
Power-on self-test ....................................................................... 4-3
Front panel tests .......................................................................... 4-3
KEYS test ............................................................................ 4-3
DISPLAY PATTERNS test ................................................ 4-3
CHAR SET test ................................................................... 4-4
Principles of operation ................................................................ 4-4
Overall block diagram ......................................................... 4-5
Analog circuits .................................................................... 4-6
Power supply ....................................................................... 4-7
Output stage ......................................................................... 4-7
A/D converter ...................................................................... 4-9
Active guard ........................................................................ 4-9
Digital circuitry ................................................................... 4-9
Display board circuit theory .............................................. 4-10
Troubleshooting ........................................................................ 4-11
Display board checks ........................................................ 4-11
Power supply checks ......................................................... 4-12
Digital circuitry checks ..................................................... 4-12
Analog circuitry checks ..................................................... 4-13
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