Agilent Technologies 54845B Manual page 108

Chapter 5: Troubleshooting
To troubleshoot the acquisition system
Acquisition Trouble Isolation (4 of 4)
A to D Converter Failed
A
Failure of this test may involve failure in the Gain test. If the Gain test also fails, first attempt to
correct the cause of the Gain test failure by running the Extended Service test for Gain. If any
of the channels pass the extended service gain test, you can either use an attenuator from a
known good channel to verify the problem in a failing channel, or simply replace the attenuator
in a failing channel with a new one.
Return the Known Good Attenuator to Original Channel
If you swap attenuators to verify that the failure follows the attenuator assembly, return the known good
attenuator to its original channel so that the attenuator contact counter is consistent with the specific
attenuator.
When you replace one or more attenuators, you must reset the attenuator contact counter for
the affected channel(s) to zero. This enables continued monitoring of the repaired channel.
If the Gain test passes, run the Extended Service test for the A to D Converter. If any of the
channels pass the extended service A to D Converter test, you can swap an A to D hybrid from
a known good channel to a suspected failing channel to verify the problem, or simply replace the
failing A to D hybrid with a new hybrid.
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