Keithley 2750 Service Manual

Front panel calibration code ................................................ 2-4
Remote calibration code ...................................................... 2-4
Comprehensive calibration ......................................................... 2-5
Calibration cycle ................................................................. 2-5
Recommended equipment ................................................... 2-5
Aborting calibration ............................................................ 2-6
Front panel calibration ........................................................ 2-6
Remote calibration ............................................................ 2-14
Manufacturing calibration ........................................................ 2-20
Recommended test equipment .......................................... 2-20
Extender board preparation ............................................... 2-20
Unlocking manufacturing calibration ................................ 2-21
Measuring function generator signal amplitude ................ 2-21
Front panel manufacturing calibration .............................. 2-21
Remote manufacturing calibration .................................... 2-22
Model 7700 calibration ............................................................. 2-23
Recommended test equipment .......................................... 2-23
Extender board connections .............................................. 2-24
Model 7700 calibration ..................................................... 2-24
3 Routine Maintenance
Introduction ................................................................................ 3-2
Setting the line voltage and replacing the line fuse .................... 3-2
Replacing the AMPS fuse .......................................................... 3-4
Replacing Model 7700 plug-in module amps fuses ................... 3-5
Replacing non-volatile RAM battery ......................................... 3-6
Replace the battery as follows: ............................................ 3-7
Plug-in module relay closure count ............................................ 3-8
Closure count commands .................................................... 3-8
Reading relay closure count ................................................ 3-8
Resetting relay closure count .............................................. 3-9
Setting count update interval ............................................... 3-9
Rack mounting .......................................................................... 3-10
Rack mount kit .................................................................. 3-10
Rack mount procedure ...................................................... 3-10
4 Troubleshooting
Introduction ................................................................................ 4-2
Repair considerations ................................................................. 4-2
Power-on self-test ....................................................................... 4-3
Front panel tests .......................................................................... 4-3
KEY test .............................................................................. 4-3
DISP test .............................................................................. 4-3
Principles of operation ................................................................ 4-4

Keithley 2750 Specifications

General

Interface	GPIB, RS-232, Ethernet
Switching Speed	Up to 500 channels/second
Maximum Voltage	300V
Operating Temperature	0°C to 50°C
Measurement Functions	DCV, ACV, DCI, ACI, 2-wire Resistance, 4-wire Resistance, Frequency, Temperature
Resolution	6.5 digits
Current	1A
Maximum Current	1A