Keithley 2700, Service Manual

Page: 66 / 174

2-18 Calibration
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
Manufacturing calibration
The manufacturing calibration procedure is normally performed only at the factory, but the
necessary steps are included here in case the unit is repaired, and the unit requires these calibra-
tion procedures.
NOTE If the unit has been repaired, the entire comprehensive calibration procedure should
also be performed in addition to the manufacturing calibration procedure.
Recommended test equipment
Table 2-13 summarizes the test equipment required for the manufacturing calibration steps.
In addition, you will need the calibrator (see Table 2-1 ) and signal generator to complete the
comprehensive calibration steps.
Table 2-13
Recommended equipment for manufacturing calibration
Stanford Research Systems DS345 Function Generator:
1V RMS, 3Hz, ±5ppm
1V RMS, 1kHz, ±5ppm
Keithley Model 2001 or 2002 Digital Multimeter:
1V, 3Hz AC, ±0.13%
Keithley 7797 Calibration/Extender Board
Keithley 7798-250B Calibration/Extender/Test Board