Checking The Signal Separation Group - Keysight N5227A Service Manual

Troubleshooting
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
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 Type
Power meter
Power sensor, 2.4 mm
Adapter, 2.4 mm (f) to 2.4 mm (f)
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
Press UTILITY
System
3. Set the sweep speed for a 10 second sweep: Press STIMULUS
time to 10.000 seconds in the
4-36
Model or 
Part Number
E4418B/E4419B
E8487A
11900B
(Figure 4-7 or Figure 4-8) is not on the analyzer screen, perform the following:
Service
, then , then
box.
Sweep Time
PNA Series Microwave Network Analyzers
"Removing the Covers" on page
Alternate Model or
Part Number
E4418A/E4419A
None
85056-60007
Utilities Receiver Display
, then
Sweep
N5227A
7-6.
.
Sweep Time
, then . Set the
Service Guide N5227-90001