62 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Instrument Information and Calibration Data
Calibration Data
After an instrument adjustment is performed the adjustment data can be saved
to overwrite data. If an overwrite data file does not already exist for the
assembly being adjusted one will be created at that time. The only data that
will be written to the overwrite data file is the arrays that were changed from
the factory values during the adjustment.
Overwrite data files are deleted whenever the calibration data is backed up or
restored.
Since the overwrite data location is non-volatile memory, data saved to it will
not be lost if the instrument power is cycled.
What Happens at Boot Up
At boot up the factory calibration data is copied to working data in the A5 CPU
memory. If there are any overwrite data files, the data for the arrays in them are
loaded into working data and will overwrite those arrays that were loaded from
the factory data.
Instrument Adjustments
When an instrument adjustment is performed the calibration data in the
working memory is modified. At the end of each adjustment the adjustment
software will save the modified data to the overwrite memory.
Once all adjustments are completed, or at any time along the way, a backup of
the working data can be performed to save all modified calibration data to the
factory data location by using the Backup Cal Data to Motherboard Memory
adjustment.
Calibration Data Backup
Once instrument adjustments are performed the calibration data arrays that
have been modified from the factory data values need to be backed up on the
assemblies that have been adjusted.
The typical way to do this is to run the last adjustment in the adjustment
software, which is Backup Cal Data to Motherboard Memory. However, the
following remote command can also be used to perform a backup:
:SERVice:C ALibrate:BACK up
When a calibration data backup is performed the factory data on the
assemblies is overwritten by working data that has been modified, and all
overwrite data files are deleted. The backup process will also backup the
option license data to the A3 RF assembly backup memory location.
Calibration Data Restore
The calibration data restore causes the instrument to revert to the factory data
saved on the instrument assemblies.
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