Service Guide N5230-90024 4-29
PNA Series Microwave Network Analyzers Troubleshooting
N5230C Measurement System Troubleshooting
Checking the Source Group
Source Group Tests
NOTE A defective test port switch can exhibit the same symptom as a faulty source. Therefore, if it
is determined that the source is functioning properly, you are directed to “Checking the
Signal Separation Group” on page 4-36.
Equipment Used for These Tests
Getting Ready to Test
Before checking the assemblies, you must open the analyzer.
CAUTION Use an antistatic work surface and wrist strap to reduce the chance of electrostatic
discharge for all of the procedures in this chapter.
1. Turn off the analyzer power.
2. Unplug the power to the analyzer and disconnect all rear panel connections.
3. Remove the covers from the analyzer. Refer to “Removing the Covers” on page 7-6.
WARNING Procedures described in this document are performed with power supplied to the product
while protective covers are removed. Energy available at many points may, if contacted,
result in personal injury.
4. With the covers off, plug in the analyzer and turn on the power.
Single vs. Broadband Failure
There are two main types of failures that are related to the source group. The failures are classified as:
•broadband
•single band
Single band failures are indicated by all four channel traces having partial dropouts across the frequency
range or intermittent phase lock problems. Troubleshooting information is provided under “If the traces
faults are band-related,” under “All Traces” on page 4-27.
Broadband failures are indicated by all four channel traces being in the noise floor. Most often this is due to
problems in the phase lock signal path and will be characterized by a “PHASE LOCK LOST” error message on
Equipment Type
Models
Used With
Model or
Part Number
Alternate Model or
Part Number
Spectrum analyzer All 8565E None
Power meter All E4418B/19B E4418A/19A
Power sensor, 3.5 mm 20 GHz models 8485A None
RF cable, 3.5 mm (f) to 3.5 mm (f) 20 GHz models 85131C Any
Power sensor, 2.4 mm 40 and 50 GHz models 8487A None
RF cable, 2.4 mm (f) to 2.4 mm (f) 40 and 50 GHz models 85133C Any
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