4-30 Service Guide N5227-90001
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5227A
Checking the Source Group
Source Group Tests
Before checking the source group 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 front and rear panel connections except installed
jumpers.
3.
Remove the outer and inner 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.
CAUTION
Do not operate the analyzer with the outer cover removed for more than 30 minutes, as this could
cause the analyzer to overheat which could result in costly damage.
Frequency Banded vs. Broadband Failure
There are two main types of failures that are related to the source group. Frequency banded failures are
indicated by all receiver traces having partial dropouts across the frequency range. Broadband failures are
indicated by all receiver traces being in the noise floor.
RF Signal Troubleshooting
Check the output power of the A, B, C, and D signals:
Equipment Used for This Check.
Equipment Type
Model or
Part Number
Alternate Model or
Part Number
Power meter E4418B/E4419B E4418A/E4419A
Power sensor, 2.4 mm E8487A None
Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B 85056-60007
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