Keithley 2002, Calibration Manual

Page: 41 / 114

Calibration
2-12
Step 7: Perform AC user calibration
To perform user AC calibration, send the following
command:
:CAL:UNPR:ACC
Note that AC calibration will take about six minutes to
complete.
Step 8: Enter calibration dates
To set the calibration date and next due date, use the follow-
ing commands to do so:
:CAL:PROT:DATE <yr>, <mon>, <day>
:CAL:PROT:NDUE <yr>, <mon>, <day>
Where <yr>, <mon>, and <day> are the year, month, and
date and must be separated by commas.
Step 9: Save calibration constants
Calibration is now complete, so you can store the calibration
constants in EEROM by sending the following command:
:CAL:PROT:SAVE
Step 10: Lock out calibration
To lock out further calibration, send the following command
after completing the calibration procedure:
:CAL:PROT:LOCK
2.9 AC self-calibration
The AC self-calibration procedure requires no external
equipment and can be performed at any time by the user. As
Table 2-6
Amps calibration summary
Cal
point Calibrator
current
Allowable range Calibration command
200µA
2mA
20mA
200mA
2A 200.000µA
2.00000mA
20.0000mA
200.000mA
1.00000A 95µA to 205µA
0.95mA to 2.05mA
9.5mA to 20.5mA
95mA to 205mA
0.95A to 2.05A
:CAL:PROT:DC:A200U 200E-6
:CAL:PROT:DC:A2M 2E-3
:CAL:PROT:DC:A20M 20E-3
:CAL:PROT:DC:A200M 200E-3
:CAL:PROT:DC:A2 1
the name implies, this calibration procedure assures the
accuracy of ACI and ACV measurements.
NOTE
The AC calibration constants generated by
this procedure are not permanently stored.
Thus, AC calibration constants are in
effect only until the power is turned off. In
order to permanently store AC calibration
constants, you must perform the compre-
hensive or low-level calibration procedure
and then choose to save calibration con-
stants at the end of that procedure. See
paragraph 2.8 or 2.10 for details.
2.9.1 Front panel AC calibration
Procedure:
1. Disconnect all test leads or cables from the INPUT and
SENSE jacks.
2. Press MENU. The instrument will display the
following:
MAIN MENU
SAVESETUP GPIB CALIBRATION
3. Select CALIBRATION, then press ENTER. The Model
2002 will display the following:
PERFORM CALIBRATION
COMPREHENSIVE POINT-CALS
4. Select POINT-CALS, then press ENTER. The instru-
ment will then display the following:
POINT CALIBRATION
AC-CAL DCV OHMS DCI
5. Select AC-CAL, then press ENTER. The instrument
will display the following message: