4-36 Service Guide N5227-90001
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5227A
Checking the Signal Separation Group
Before checking the signal separation 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 cover 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.
Checking the Output Power of the A, B, C, and D Signals
Using a power meter, you can measure the outputs of the A, B, C, and D signals from the front panel. The
measurement results will help you isolate a faulty assembly. The output of the R receiver cannot be
measured because it would necessitate breaking the phase lock loop, causing all of the signals to be lost.
Equipment Used for This Check
Equipment Setup
1. Before starting these checks, zero and calibrate the power meter. (See the power meter user’s guide for
instructions on setting the calibration factor.)
2. If the
Receiver Display (Figure 4-7 or Figure 4-8) is not on the analyzer screen, perform the following:
Press UTILITY , then , then , then .
3. Set the sweep speed for a 10 second sweep: Press STIMULUS , then . Set the
time to 10.000 seconds in the
Sweep Time box.
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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