Agilent Technologies N5242A, Service Manual

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Service Guide N5242-90001 4-23
PNA Series Microwave Network Analyzers Troubleshooting
N5242A Measurement System Troubleshooting
Measurement System Troubleshooting
This section provides troubleshooting procedures for the measurement portion of the PNA.
In this section, the analyzer is used as a tool to help isolate the suspected faulty functional
group. Once the faulty functional group is determined, troubleshooting steps are provided
to help you isolate the faulty assembly or part.
Before you begin—consider: Where do you see a problem?
If you are seeing a problem at
Preset
, perform the standard S-parameter test set
troubleshooting procedure, starting with: “Verifying the A, B, C, D, and R Traces (Standard
S-Parameter Mode)” on page 4-25 .
You should also consider the problem indications that are observed and whether the
observed condition is a soft failure or a hard failure.
Soft Failure
With a soft failure, the network analyzer's performance has degraded to an unacceptable
level, yet it continues to operate and displays no error messages. For this type of failure,
performance tests must be conducted to isolate the problem. Begin with viewing the error
terms as described in
“Error Terms” on page 8-3 . This will help to isolate most problems. If
additional tests are required, refer to “Performance Tests” on page 3-28 .
Hard Failure
With a hard failure, the PNA does not perform well and displays one or more error
messages. To diagnose and repair a hard failure:
• Check “Help About” to verify that the model number and options listed match the
actual analyzer model and options.
• Check “EEPROM Headers” to verify that the data there is correct.
• Check error messages. Refer to “Error Messages” and follow the suggestions outlined
there for each applicable error message.
Help About
Go to the Help About screen by pressing UTILITY , then , then .
Verify that the information displayed in this screen is correct for your analyzer. If any of
the information is incorrect, contact Agilent Technologies. Refer to
“Contacting Agilent” on
page 2-13 .
System
Help About NA ...