N9030B PXA Signal Analyzer Service Guide 81
Boot Up and Initialization Troubleshooting
Signal Level Verification
Signal Level Verification
Signal Level Problem with
Input Frequencies < 3.6 GHz
Measure the 50 MHz RF calibrator signal level by pressing Input/Output, RF
Calibrator, 50 MHz. Now press Freq, 50 MHz, SPAN, 1 MHz, Peak Search. If
the analyzer is functioning correctly in low band, the 50 MHz calibrator level
should be −25 dBm ± 2 dB. See the figure below.
Is the signal level correct?
If yes:
The analyzer low band path is functioning properly at least at 50 MHz.
If no:
Refer to Chapter 4, “RF Section Troubleshooting (RF/Microwave
Analyzers)” in this manual.
It is possible that other input frequencies < 3.6 GHz could have an
amplitude problem even though the 50 MHz calibrator is within tolerance.
Using the internal RF calibrator provides a quick check of the low band
path.
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