Keithley 2701, Service Manual

Page: 64 / 168

2-18 Calibration Model 2701 Service Manual
AC current calibration
Follow these steps for AC current calibration:
1. Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2701 as
shown in
Figure 2-3 .
2. Perform the calibration steps summarized in Table 2-12 . For each step:
• Set the calibrator to the indicated current and frequency, make sure the unit is in
operate. (You must use the stated current and frequency.)
• Send the indicated programming command.
• Wait until the Model 2701 completes each step before continuing.
Programming calibration dates
Program the present calibration date and calibration due date by sending the following
commands:
:CAL:PROT:DATE <year>, <month>, <day>
:CAL:PROT:NDUE <year>, <month>, <day>
For example, the following commands assume calibration dates of 12/15/1999 and
12/15/2000 respectively:
:CAL:PROT:DATE 1999, 12, 15
:CAL:PROT:NDUE 2000, 12, 15
Saving calibration constants
After completing the calibration procedure, send the following command to save the new
calibration constants:
:CAL:PROT:SAVE
NOTE Calibration constants will not be saved unless the :CAL:PROT:SAVE command is
sent.
Locking out calibration
After saving calibration, send the following command to lock out calibration:
:CAL:PROT:LOCK
Table 2-12
AC current calibration programming steps
Calibration step Calibrator current, frequency Calibration command
100mA at 1kHz
1A at 1kHz
2A at 1kHz 100.0000mA, 1kHz
1.000000A, 1kHz
2.000000A, 1kHz :CAL:PROT:AC:STEP11
:CAL:PROT:AC:STEP12
:CAL:PROT:AC:STEP13