Keithley 2701, Руководство пользователя

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Table of Contents Model 2701 Ethernet-Based DMM / Data Acquisition System
ii
Connections.......................................................................................... 2-5
Pseudocards......................................................................................... 2-6
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
........................................................................... 3-1
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
Resistance measurements (
Ω
2 and
Ω
4).................................................... 3-20
Connections........................................................................................ 3-20
Standard resistance measurements ................................................... 3-23
Offset-compensated ohms.................................................................. 3-24
Measurement methods ....................................................................... 3-25
2701-900-01.book Page ii Wednesday, August 3, 2011 9:43 AM