Keithley 2002

Calibration
2-13
AC CALIBRATION PHASE
Disconnect inputs; press ENTER
6. Press ENTER to begin AC calibration, which will take
about six minutes to complete. During AC calibration,
the instrument will display the following:
Calibrating AC: Please wait
7. Once the process has been successfully completed, the
message below will be displayed, and you can press
ENTER or EXIT to return to normal display:
AC CAL COMPLETE
Press ENTER or EXIT to continue.
2.9.2 IEEE-488 bus AC self-calibration
Procedure:
1. Disconnect all test leads and cables from the INPUT and
SENSE jacks.
2. Send the following command over the bus: ":CAL:UN-
PR:ACC".
3. Wait until calibration has been completed before send-
ing any further commands (about six minutes).
4. Check for calibration errors by using the :SYST:ERR?
query.
2.10 Low-level calibration
Low-level calibration is normally performed only at the fac-
tory when the instrument is manufactured and is not usually
required in the field. The following paragraphs give detailed
procedures for performing low-level calibration should it
ever become necessary in the field.
NOTE
Low-level calibration is required in the
field only if the Model 2002 has been
repaired, or if the other calibration proce-
dures cannot bring the instrument within
stated specifications. The low-level cali-
bration procedure includes the compre-
hensive calibration steps discussed in
paragraph 2.8.
2.10.1 Recommended equipment for low-level
calibration
Table 2-7 summarizes recommended equipment for low-
level calibration. Alternate equipment may be used as long as
corresponding specifications are at least as good as those
listed in the table.
2.10.2 Low-level calibration summary
Table 2-8 summarizes the steps necessary to complete the
low-level calibration procedure. The procedure should per-
formed in the order shown in the table. Calibration com-
mands shown are to be used when calibrating the unit over
the IEEE-488 bus.
WARNING
Some low-level calibration steps require
the use of hazardous voltages.
See Appendix B for example calibration programs.