56 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Instrument Information and Calibration Data
Serial Number
Serial Number
When an instrument leaves the factory, it has its serial number saved in two
different locations along with an encrypted license code. This is saved in the A5
CPU assembly and the A3 RF assembly. Neither location is accessible to the
user or service technician.
Replacement A3 RF assemblies and A5 CPU assemblies do not have a serial
number in them as they leave the factory.
When a replacement A3 RF assembly is installed, the instrument will recognize
that there is no serial number in it and will use the serial number in the A5 CPU
assembly.
When a replacement A5 CPU assembly is installed into an instrument it will
recognize that there is no serial number in it and it will use the serial number
found in the A3 RF assembly.
If for some reason during servicing a combination of a new A3 RF assembly and
a new A5 CPU assembly both get installed into an instrument, with no serial
number in either of them, the following errors will be seen:
617 Configuration Error; Instrument serial number is not set. Instrument
must be returned for service.
617 Configuration Error: The backup memory contains license keys for
serial number <serial number>. Use the service procedure to overwrite the
backup memory.
617 Configuration Error; The instrument has no frequency range option
installed. Use the service procedure to recover instrument licenses from the
backup.
If this happens the instrument will need to be sent to a Keysight service
location for the factory support team to remotely reprogram the instrument
serial number into both the A3 RF assembly and the A5 CPU assembly.
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