412 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Pre and Post-Repair Procedures
Pre Repair Procedures
Pre Repair Procedures
To ensure a successful assembly replacement there are steps that can be taken
before an assembly is removed. These steps will help to ensure that vital
instrument information will be properly transferred from the defective
assemblies to the replacements.
There are four types of instrument information that one should be concerned
about when an assembly is being removed and replaced. They are:
— The instrument model number.
— The instrument serial number.
— The instrument licenses.
— The instrument calibration data.
During an assembly replacement neither the model number or serial number
should be lost, unless multiple assemblies are changed at the same time,
which should always be avoided if possible. However, certain steps need to be
taken to ensure that the licenses and calibration data are properly handled.
For information on how and where all of these are saved in the instrument, see
Chapter 3, “Instrument Information and Calibration Data.”
Licenses
Since the option license keys are saved on the A5 CPU assembly and backed
up on the A3 RF assembly, it is important to make sure that the A3 RF backup
has all the latest license keys backed up on it before the A5 CPU assembly is
replaced. If this does not happen any licenses that were installed since the last
backup will not be restored after the A5 CPU assembly is replaced.
Calibration Data
Factory calibration data is stored on the A2 Vector BBG assembly, the A3 RF
assembly, and the A7 Micro-Deck assembly. If any adjustments have been
made and saved, but have not been backed up to these assemblies, there will
be calibration data for the adjustments performed on the A5 CPU assembly
that will supersede the factory data. This calibration data for an assembly
being replaced that is residing on the A5 CPU assembly will need to be
removed so that it will not be used with the replacement assembly.
Backup Process
Backing up both the option licenses and calibration data can be done using the
same procedure and needs to be performed before replacing the assemblies
listed in Table 16-1. The backup routine can be found in the instrument
adjustments of the performance verification and adjustment software.
However, this can also be performed using the following remote command:
:SERVice:C ALibration:BA CKup
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