Table of Contents
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6.6.2
Memory elements ..................................................................................................................................... 6-9
6.6.3
Device selection ........................................................................................................................................ 6-9
6.6.4
IEEE-488 bus ............................................................................................................................................ 6-9
6.6.5
Input/output circuitry .............................................................................................................................. 6-10
6.6.6
Display circuitry ..................................................................................................................................... 6-10
6.7
Power supplies .................................................................................................................................................. 6-11
7
7.1
Introduction ......................................................................................................................................................... 7-1
7.2
Line voltage selection ......................................................................................................................................... 7-1
7.3
Line fuse replacement ......................................................................................................................................... 7-2
7.4
Calibration .......................................................................................................................................................... 7-2
7.4.1
Calibration cycle ....................................................................................................................................... 7-2
7.4.2
GUARD switch ......................................................................................................................................... 7-2
7.4.3
Calibration jumper .................................................................................................................................... 7-2
7.4.4
Required calibration equipment ................................................................................................................ 7-3
7.4.5
Environmental conditions ......................................................................................................................... 7-3
7.4.6
Calibration sequence ................................................................................................................................. 7-3
7.4.7
Input offset adjustment ............................................................................................................................. 7-3
7.4.8
Input current adjustment ........................................................................................................................... 7-4
7.4.9
Calibration program .................................................................................................................................. 7-4
7.4.10
Amps calibration ....................................................................................................................................... 7-4
7.4.11
Coulombs calibration ................................................................................................................................ 7-5
7.4.12
Volts calibration ........................................................................................................................................ 7-6
7.4.13
Ohms calibration ....................................................................................................................................... 7-7
7.4.14
Permanent storage of calibration constants .............................................................................................. 7-7
7.4.15
IEEE-488 bus digital calibration .............................................................................................................. 7-7
7.4.16
Additional calibration points .................................................................................................................... 7-8
7.5
Special handling of static-sensitive devices ....................................................................................................... 7-8
7.6
Disassembly instructions .................................................................................................................................... 7-9
7.7
Troubleshooting ................................................................................................................................................ 7-11
7.7.1
Recommended test equipment ................................................................................................................ 7-11
7.7.2
Power-up self-test ................................................................................................................................... 7-11
7.7.3
Self-diagnostic program .......................................................................................................................... 7-11
7.7.4
Power supply checks ............................................................................................................................... 7-13
7.7.5
Relay configuration ................................................................................................................................ 7-13
7.7.6
Ranging amplifier gain configuration ..................................................................................................... 7-14
7.7.7
A/D converter and display ...................................................................................................................... 7-14
7.7.8
Input and ranging amplifiers ................................................................................................................... 7-14
7.7.9
Digital circuitry ....................................................................................................................................... 7-14
7.7.10
Display board .......................................................................................................................................... 7-14
7.8
Input stage balancing procedure ....................................................................................................................... 7-17
7.9
Handling and cleaning precautions ................................................................................................................... 7-17
8
8.1
Introduction ......................................................................................................................................................... 8-1
8.2
Parts list .............................................................................................................................................................. 8-1
8.3
Ordering information .......................................................................................................................................... 8-1
8.4
Factory service .................................................................................................................................................... 8-1
8.5
Component layout drawings and schematic diagrams ........................................................................................ 8-1
iv
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