Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 61
Instrument Information and Calibration Data
Calibration Data
Calibration Data
Instrument calibration data is stored in three different location types:
1. Factory Calibration Data - Non-volatile memory on the assembly for which
it is intended.
2. Working Data - Volatile memory on the A5 CPU.
3. Overwrite Data - Non-volatile memory on the A5 CPU.
Factory Calibration Data
Factory calibration data is saved in three different assemblies:
1. A2 Vector BBG assembly
2. A3 RF assembly
3. A7A1 Microwave ALC assembly
This is non-volatile memory on the assemblies where the factory calibration
data is stored. While some of this data may be the same for all assemblies, this
is also where the individual data is stored that has been generated by the
instrument adjustments.
Replacement assemblies are also tested and adjusted at the factory and will
contain the same data as they would if they were shipped in new instruments.
When an instrument adjustment is performed during servicing and then
backed up, it will overwrite the factory data.
Working Calibration Data
This is the calibration data that is loaded into volatile memory in the A5 CPU
assembly at instrument boot up. This data could have been loaded from either
the factory data or overwrite data.
When an instrument adjustment is performed the working data is where the
new calibration data is originally stored. It can then be saved to either the
overwrite data or factory data location.
Since the working data location is volatile memory, if it were to be modified
and not saved to another data location it would be lost if the instrument power
is cycled.
Overwrite Calibration Data
Overwrite calibration data is saved in non-volatile memory on the A5 CPU
assembly. There are separate overwrite data files for each of the assemblies
that contain factory data, if overwrite data exists. As shipped from the factory,
there are no overwrite data files, only factory data.
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