4-42 Keysight N5227B Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
4.
With the covers off, plug in the analyzer and turn on the power.
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
) 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.
Checking Port 1, 2, 3, or 4 Power Outputs (A, B, C, or D Signals)
The object of this check is to verify the power of the output signal across the
entire frequency range. Perform this test if there is an observed problem only
with one receiver trace. The ten second sweep is slow enough to allow you to
observe the output power on the power meter as the sweep occurs.
1.
Connect the power sensor to the suspect port.
2.
Set the trace to measure S
11
, S
22
, S
33
, or S
44
, dependent on the suspect
port.
3.
Observe the power reading on the power meter as the sweep occurs on
the analyzer.
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.
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
System
Service
Utilities
Receiver Display
Sweep
Sweep Time
