Keithley 2520, Service Manual, Page: 9 / 137

Motherboard removal ................................................................. 5-4
Front panel disassembly ............................................................. 5-5
Removing power components .................................................... 5-6
Power supply module removal ........................................... 5-6
Power module removal ....................................................... 5-6
Instrument re-assembly .............................................................. 5-6
Testhead disassembly ................................................................. 5-7
Case disassembly ................................................................ 5-7
Output board removal ......................................................... 5-7
Input board removal ............................................................ 5-7
Testhead re-assembly ................................................................. 5-7
6 Replaceable Parts
Introduction ................................................................................ 6-2
Parts lists .................................................................................... 6-2
Ordering information ................................................................. 6-2
Factory service ........................................................................... 6-2
Component layouts .................................................................... 6-2
A Specifications
Accuracy calculations ............................................................... A-8
Measurement accuracy ...................................................... A-8
Source accuracy ................................................................. A-8
B Calibration Reference
Introduction ............................................................................... B-2
Command summary .................................................................. B-2
Miscellaneous commands ......................................................... B-3
Measurement commands ........................................................... B-6
Current source commands ......................................................... B-7
Voltage bias source commands ................................................. B-8
Detecting calibration errors ....................................................... B-9
Reading the error queue ..................................................... B-9
Error summary ................................................................... B-9
Status byte EAV (Error Available) bit ............................. B-10
Generating an SRQ on error ............................................ B-10
Detecting calibration step completion ..................................... B-10
Using the *OPC? query ................................................... B-10
Using the *OPC command .............................................. B-11
Generating an SRQ on calibration complete ................... B-11