Channel assignments .................................................................. 2-6
System channel operation ........................................................... 2-7
2-wire functions ................................................................... 2-8
4-wire functions (paired channels) ...................................... 2-9
Controlling the system channel ......................................... 2-10
Non-amp and non-measure switching modules ................ 2-14
Multiple channel operation ....................................................... 2-16
Controlling multiple channels ........................................... 2-17
Multiple channel operation anomalies .............................. 2-22
Dual independent multiplexers .......................................... 2-24
Identifying installed modules and viewing closed
channels ................................................................................. 2-30
CARD menu ...................................................................... 2-30
Switching module queries (remote operation) .................. 2-32
Relay closure count .................................................................. 2-34
Reading relay closure count .............................................. 2-35
Setting count update interval ............................................. 2-35
Model 7700 switching module ................................................. 2-36
Switching module capabilities .......................................... 2-36
Schematic diagram ............................................................ 2-37
3 Basic DMM Operation
DMM measurement capabilities ................................................. 3-2
High energy circuit safety precautions ....................................... 3-3
Performance considerations ........................................................ 3-4
Warm-up .............................................................................. 3-4
Autozero .............................................................................. 3-4
LSYNC (line cycle synchronization) .................................. 3-5
Remote programming — autozero and LSYNC ................. 3-6
Channel list parameter (<clist>) ................................................. 3-7
Voltage measurements (DCV and ACV) .................................... 3-8
DCV input divider ............................................................... 3-8
Connections ......................................................................... 3-8
Volts measurement procedure ........................................... 3-11
AC voltage measurements and crest factor ....................... 3-12
Low level considerations ................................................... 3-15
Current measurements (DCI and ACI) ..................................... 3-17
Connections ....................................................................... 3-17
Amps measurement procedure .......................................... 3-18
AMPS fuse replacement (front panel AMPS input) .......... 3-19
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