Keysight NFA Series Noise Figure Analyzers Service Guide 67
Boot Up and Initialization Troubleshooting
Signal Level Verification
Signal Level Problem with
Input Frequencies > 3.6 GHz
Measure the 4.8 GHz RF calibrator signal level by pressing MODE/MEAS,
Spectrum Analyzer, OK, Input/Output, RF Calibrator, 4.8 GHz. Now press
FREQ, 4.8 GHz, Span, 1 MHz, Peak Search. If the analyzer is functioning
correctly in high band, the 4.8 GHz calibrator level should be −28 dBm ± 2 dB.
See the figure below.
Is the signal level correct?
If yes:
The analyzer high band path is functioning properly at least at 4.8 GHz.
If no:
Refer to Chapter 4, “RF Section Troubleshooting (N8973B, 74B, 75B
Analyzers)” in this manual.
It is possible that other input frequencies > 3.6 GHz could have an
amplitude problem even though the 4.8 GHz calibrator is within tolerance.
Using the internal RF calibrator provides a quick check of the high band
path.
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