N9030B PXA Signal Analyzer Service Guide 233
Analog/Digital IF Troubleshooting
A2 Analog IF Troubleshooting
Verifying the 22.5 MHz Output Power
1. Perform an instrument shutdown.
2. Turn the instrument over so the bottom side of the analyzer is facing up.
3. Turn on the PXA Signal Analyzer and wait for the instrument to complete
the boot up process.
4. Press System, Alignments, Auto Align, Off.
5. Press Input/Output, RF calibrator, 50 MHz.
6. 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)” in
this service guide.
7. 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 that Atten: 10 dB is visible. If needed change the input
attenuator by pressing AMPTD, Attenuation, 10 dB on the analyzer.
8. Referring to Figure 7-3, carefully disconnect the W42 cable at A3J19.
Figure 7-3 A3 Digital IF Cables
9. Connect the W42 cable to the MMCX female to SMA female connector.
Use an appropriate cable to go from the SMA connector to the RF input of
a functioning spectrum analyzer to verify the 22.5 MHz I.F. and amplitude
is correct.
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