Keysight NFA Series Noise Figure Analyzers Service Guide 267
Analog/Digital IF Troubleshooting
25 MHz BW IF Section
12.The analyzer should read 10 MHz at +5 dBm ± 3 dBm as shown in Figure
7-10.
Figure 7-10 A3 Digital I.F. Reference Input
If the 22.5 MHz and 10 MHz signals measure the correct frequency and
amplitude and yet the display is not processing the signal properly, the
most probable causes are the A3 Digital IF or the A4 CPU. It is difficult to
separate these two assemblies given the architecture of the analyzer. Each
assembly will have to be tried to see which one is causing the failure.
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