166 Keysight NFA Series Noise Figure Analyzers Service Guide
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
Troubleshooting
Press Mech Atten and enter 10 dB. The 50 MHz calibrator signal measured on
the functioning Spectrum Analyzer should measure 10 dB lower than the first
step (~−35 dBm). Continue testing all the attenuation settings as described in
Table 4-10.
Table 4-10
Attenuator Setting
(dB)
Expected Level
(dBm @ 50 MHz)
Tolerance
16 −41 ±3 dB
20 −45 ±3 dB
30 −55 ±3 dB
40 −65 ±4 dB
50 −75 ±4 dB
60 −85 ±4 dB
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