Service Guide N5242-90001 4-33
PNA Series Microwave Network Analyzers Troubleshooting
N5242A Measurement System Troubleshooting
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 channel 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 4-6 or Figure 4-7) 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/E441B E4418A/E4419A
Power sensor, 3.5 mm E8485A None
Adapter, 3.5 mm (f) to 3.5 mm (f) 83059B 85052-60012
System
Service Utilities
Receiver Display
Sweep
Sweep Time
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