Keithley 2750, Service Manual

Page: 5 / 179

Table of Contents
1 Performance Verification
Introduction ................................................................................ 1-2
Verification test requirements .................................................... 1-3
Environmental conditions ................................................... 1-3
Warmup period .................................................................... 1-3
Line power .......................................................................... 1-3
Recommended test equipment ................................................... 1-4
Verification limits ....................................................................... 1-5
Example reading limit calculation ...................................... 1-5
Calculating resistance reading limits .................................. 1-5
Restoring factory defaults .......................................................... 1-6
Performing the verification test procedures ............................... 1-6
Verification test summary ................................................... 1-6
Test considerations .............................................................. 1-7
Model 2750 verification ............................................................. 1-8
Verifying DC voltage .......................................................... 1-8
Verifying AC voltage ........................................................ 1-10
Verifying DC current ........................................................ 1-11
Verifying AC current ........................................................ 1-13
Verifying normal resistance .............................................. 1-14
Verifying dry circuit resistance ......................................... 1-16
Verifying temperature ....................................................... 1-18
Verifying frequency .......................................................... 1-20
Model 7700 verification ........................................................... 1-20
Verifying DC voltage ........................................................ 1-21
Verifying AC voltage ........................................................ 1-22
Verifying DC current ........................................................ 1-24
Verifying AC current ........................................................ 1-25
Verifying normal resistance .............................................. 1-26
Verifying dry circuit resistance ......................................... 1-28
Verifying temperature ....................................................... 1-31
Verifying frequency .......................................................... 1-34
Verifying ratio and average ............................................... 1-35
2 Calibration
Introduction ................................................................................ 2-2
Environmental conditions .......................................................... 2-2
Warmup period .................................................................... 2-2
Line power .......................................................................... 2-2
Calibration considerations .......................................................... 2-3
Calibration code ......................................................................... 2-4