Measurement System Troubleshooting; Before You Begin-Consider: Where Do You See A Problem - Keysight N5224A Service Manual

PNA Series Microwave Network Analyzers
N5224A and N5225A

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.
IMPORTANT Some procedures in this chapter reference your analyzer's DSP version. Click Help > About
Network Analyzer and note the DSP version shown.
Before you begin—consider: Where do you see a problem?
If you are seeing a problem at
starting with: "Verifying the A, B, C, D, and R Traces (Standard S-Parameter Mode)" on page
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
page 8-3. This will help to isolate most problems. If additional tests are required, refer to
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"
• Check error messages. Refer to
applicable error message.
Help About
Go to the Help About screen by pressing UTILITY
information displayed in this screen is correct for your analyzer. If any of the information is incorrect, contact
Keysight Technologies. Refer to
Service Guide N5225-90001
, perform the standard S-parameter test set troubleshooting procedure,
Preset
to verify that the data there is correct.
"Error Messages" and follow the suggestions outlined there for each
System
"Contacting Keysight" on page
Measurement System Troubleshooting
, then , then
Help About NA...
2-8.
Troubleshooting
4-26.
"Error Terms" on
"Performance
. Verify that the
4-23