N9030B PXA Signal Analyzer Service Guide 155
RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
IMPORTANT Turn off auto align by pressing System, Alignments, Auto Align, Off.
Disconnect the W16 cable from A13A1J7 on the Front End Assembly IF
Out.See Figure 4-1.
Connect A13A1J7 output to a functioning spectrum analyzer and verify the
322.5 MHz intermediate frequency is measuring −22 dBm ± 3 dB using the
same analyzer settings as in Figure 4-2.
Figure 4-2 322.5 MHz Intermediate Frequency
If this power level is correct the signal path from the A9 50 MHz Reference
signal input port to A13A1J7, IF Output is operating correctly using a 50 MHz
input calibrator signal. Reconnect the W16 cable to A13A1J7.
Flatness issues or power level problems at other input frequencies below
3600 MHz may exist. This type of problem can be diagnosed using an
external source to verify performance.
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