Keysight NFA Series Noise Figure Analyzers Service Guide 219
RF Section Troubleshooting (N8976B)
Troubleshooting
Connect A13J7 output to a functioning spectrum analyzer and verify the
322.5 MHz intermediate frequency is measuring −32 ± 4 dB as shown in Figure
5-8.
Figure 5-8 322.5 MHz Intermediate Frequency
If this power level is correct the Front End assembly is operating correctly in
high band. If this power level is incorrect verify the following assemblies using
the 4.8 GHz internal calibrator signal.
1. A11 Low Band Switch
2. A10 Input Attenuator B
3. A9 Input Attenuator A
4. A16 Reference Assembly (4.8 GHz calibrator)
5. A12 YTF Preselector
6. A13 Front End Assembly
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