Calibration Procedures 3
Keysight 34980A Service Guide 37
Calibration Process
The following general procedure is the recommended method to complete a full
instrument calibration.
1 Read “DMM Test Considerations” on page 42 and “Plug-in Module Test
Considerations” on page 55.
2 Perform the verification tests to characterize the instrument (incoming data).
3 Unsecure the instrument for calibration (“Calibration Security” on page 35).
4 Perform the DMM adjustment procedures (“Internal DMM Adjustments” on
page 50).
5 Perform the DAC adjustment procedures if either the 34951A (“34951A 4-Ch
Isolated DAC Module” on page 56) or 34952A (“34952A Multifunction Module”
on page 61) is installed.
6 Secure the instrument against calibration.
7 Note the new security code and calibration count in the instrument’s
maintenance records.
Aborting a Calibration in Progress
Sometimes it may be necessary to abort a calibration after the procedure has
already been initiated. You can abort a calibration at any time on any module by
turning off the power. You can abort a calibration on the internal DMM or the
34951A 4-Ch Isolated DAC by issuing a remote interface device clear message.
You can abort a calibration on the 34952A Multifunction Module by sending the
CALibration:ABORt command.
The 34951A 4-Ch Isolated DAC is intended to be adjusted frequently to
compensate for changes in the module’s environment. These adjustments can
be made either volatile or non-volatile. See page 56 for details.
If you abort a calibration in progress when the instrument is attempting to write
new calibration constants to EEPROM, you may lose all calibration constants
for the function. Typically, upon re-applying power, the instrument will report
error 705 Cal:Aborted. You may also generate errors 740 through 746. If this
occurs, you should not use the instrument until a complete re-adjustment has
been performed. For a list of calibration error numbers, see page 76.
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