200 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Analog/Digital IF Troubleshooting
A3 Digital IF Troubleshooting
A3 Digital IF Troubleshooting
Verifying the 22.5 MHz Input Power
1. Perform an instrument shutdown.
2. Remove the cover of the UXA Signal Analyzer. Refer to Chapter 15,
“Assembly Replacement Procedures”, on page 347 in this service guide.
3. Turn the instrument over so that the bottom side of the analyzer is facing
up.
4. Turn on the UXA Signal Analyzer and wait for the instrument to complete
the boot up process.
5. Press System, Alignments, Auto Align, Off. Press X
6. Press the pull down menu.
7. Press Input/Output, RF Calibrator, 50 MHz
8. Verify the 50 MHz signal is at −25 dBm by pressing FREQ, 50 MHz, SPAN,
1 MHz, Peak Search on the analyzer. The marker readout should be 50
MHz at −25 dBm ± 3 dB. If this reference signal is measuring incorrectly,
see Chapter 4, “RF Section Troubleshooting (RF/Microwave Analyzers)”,
on page 139 in this service guide.
9. To continue verifying press SPAN, Zero Span. Verify the input attenuator
on the UXA is set to 10 dB. Look near the top of the display near the center
and verify Atten: 10 dB is visible. If needed change the input attenuator by
pressing AMPTD, Attenuation, 10 dB on the analyzer.
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