240 N9030B PXA 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 PXA Signal Analyzer. Refer to Chapter 16,
“Assembly Replacement Procedures”, on page 429 in this service guide.
3. Turn the instrument over so that the bottom side of the analyzer is facing
up.
4. Turn on the PXA Signal Analyzer and wait for the instrument to complete
the boot up process.
5. Press System, Alignments, Auto Align, Off
6. Press Input/Output, RF Calibrator, 50 MHz
7. 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 147 in this service guide.
8. To continue verifying press SPAN, Zero Span. Verify the input attenuator
on the PXA 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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