4-38 Keysight N5224B/25B Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
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.
To isolate a broadband RF signal generation failure, check the test port
output power:
1.
Note the power reading displayed on the power meter; it should be the
preset power level +/- 1 dB.
2.
Connect the power sensor, in turn, to Ports 2, 3, and 4 and set trace to
measure S22, S33, and S44 respectively. Note the power reading
displayed on the power meter.
— If the power level is low or high on all test ports, the problem is LO signal
related. Continue with
“Checking the A14 50 MHz Reference Outputs”
— If the power level is low or high on only one of the test ports, the problem is
either source group or in the signal separation group. Continue with
“Checking the A14 50 MHz Reference Outputs”
to check the source group.
Checking the A14 50 MHz Reference Outputs
1.
Refer to the block diagram at the end of this chapter and to
Assemblies and Cables, All Options, Serial Number Prefixes <6021” on
. Locate flexible cables W75, W76, and W77, at the A14
frequency reference board.
2.
Disconnect cables W75, W76, and W77, one at a time, from the A14
board.
3.
Connect the spectrum analyzer to the open connector on the A14 board.
4.
The spectrum analyzer should measure a signal at 50 MHz.
5.
If any of the 50 MHz signals are not present, replace the A14 frequency
“Removing and Replacing the A4–A17 Boards”
6.
If the 50 MHz signals are present, reconnect the cables, and then:
System
Service
Utilities
Receiver Display
Sweep
Sweep Time
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Страница 212: ...5 50 Keysight N5224B 25B Service Guide Theory of Operation Receiver Group Operation 5 Figure 5 17 4 Port Receiver Group...
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Страница 220: ...5 58 Keysight N5224B 25B Service Guide Theory of Operation Power Supply Group Operation 5...
Страница 225: ...Keysight N5224B 25B Service Guide 6 5 Replaceable Parts Rebuilt Exchange Assemblies Figure 6 1 Module Exchange Procedure...
Страница 490: ...6 270 Keysight N5224B 25B Service Guide Replaceable Parts Replaceable Parts Listings 6...
Страница 608: ...8 102 Keysight N5224B 25B Service Guide General Purpose Maintenance Procedures Correction Constants 8...
Страница 612: ...Appendix 4 Service Guide EEPROM Address Assignments and Location N5224 5A B PNA and N5244 5A B PNA X Instruments...
Страница 613: ...Installation Note Xxxxx xxxxx 3...