192 Keysight NFA Series Noise Figure Analyzers Service Guide
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
Troubleshooting
If the power levels measure correctly, reconnect the W9 cable and reset the
input attenuation to 10 dB by pressing Mech Atten, 10 dB on the analyzer.
If either of these levels measure incorrectly, Input Attenuator B is the most
probable cause, provided the switch control logic has been verified.
1. It may be difficult to measure the higher attenuator settings using the
-28 dBm internal calibrator signal. Use an external source with the
frequency set to 4.8 GHz and adjust the output level to 0 dBm. This will
increase the measured power levels noted in the table above by 28 dB.
2. Tolerances should be used as a guideline.
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