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 :SAVE command is sent.
Calibration constants can be returned using the :CAL:PROT:DATA? command. For
details, see “Miscellaneous commands, :DATA?” in Appendix B.
Default calibration constants and tolerances are listed in Appendix B (see Table B-2).
Locking out calibration
After saving calibration, send the following command to lock out calibration:
:CAL:PROT:LOCK
Factory calibration
The following calibration procedures are normally performed only at the factory, but the
necessary steps are included here in case the unit is repaired (such as changing internal
components), and the unit requires these calibration procedures. The unit will also require
factory calibration if a +516, “Linearity Precal Lost” error occurs.
Recommended test equipment
Table 2-6 summarizes the test equipment recommended for the manufacturing calibration
steps.
Table 2-6
Recommended factory calibration equipment
Description Manufacturer/model Specifications*
DC Calibrator Fluke 5700A 1V: ±7ppm
10V: ±5ppm
Low Thermal Input Cable Keithley 2107
Low Thermal Short Keithley 2188
BNC-to-Clip Leads
* 90-day total uncertainty at specified output.
2-12 Calibration
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