Keysight Technologies N9040B UXA Signal Analyzer Service Guide 165
RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
A13 Front End Assembly Verification
Many portions of the Front End Assembly have been verified earlier in the High
Band troubleshooting process outlined above.
The input signal level was measured on W15 as part of the A13 Front End Input
Verification.
The output signal level was measured at the output of W16 cable during the
quick check to verify the High Band signal path.
The LO input at W20, and the LO outputs were tested when performing the
First LO Verification.
High Band Preamp (Option P08, P13, P26)
If a preamp option listed above is installed, the High Band preamp can be
verified as follows:
View the 4.8 GHz calibrator signal on screen. Press
AMPTD Y Scale
. Tap
Signal
Path
,
Internal Preamp Low Band
,
Full Range
,
On
to activate the preamp.The
expected operation is the signal level will not change more than +/- 0.5 dB and
the noise floor will increase due to the fact the input attenuation was
automatically increased.
If the amplitude error when switching the preamp on and off is greater than 0.5
dB, assure that any other internal alignment failures are resolved since the
System Gain alignment must run before optimum performance is possible. The
amplitude error could be caused by poor frequency response, and performing
the high band frequency response adjustment (using the calibration software)
will adjust the preamp on, high band path. Assure you have evaluated all
causes including A15 Front End Controller switching problems, before you
replace the Front End assembly.
The A13 Front End assembly is shown as A13A1 and A13A2 for troubleshooting clarification.
However, A13A1 and A13A2 are not separately replaceable. The entire A13 assembly must be
replaced.
Содержание N9040B Option 513
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Страница 138: ...138 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Instrument Messages Condition Messages ...
Страница 240: ...240 Chapter 11 Hardware Options A21 Wideband Analog IF Troubleshooting Figure 11 1 Analog IF Block Diagram ...
Страница 256: ...256 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Block Diagrams Block Diagrams Block Diagrams ...
Страница 306: ...306 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts Figure 14 2 External Hardware ...
Страница 338: ...338 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts Figure 14 28 Chassis ...
Страница 346: ...346 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts ...
Страница 502: ...502 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Post Repair Procedures ...
Страница 532: ...532 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Functional Tests Scale Fidelity ...
Страница 536: ...536 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Instrument Software Software Updates ...
Страница 541: ...Index Index 541 Y yellow LED 48 51 yig filter see A12 YTF YTF see A12 YTF ...