Signal Level Verification; Signal Level Problem With Input Frequencies < 3.6 Ghz - Keysight N8973B Service Manual

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 MODE/MEAS,
Spectrum Analyzer, OK, Input/Output, RF Calibrator, 50 MHz. Now press
FREQ, and input 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:
If no:
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.
66
The analyzer low band path is functioning properly at least at 50 MHz.
Refer to Chapter 4, "RF Section Troubleshooting (N8973B, 74B, 75B
Analyzers)" in this manual.
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