266 Keysight NFA Series Noise Figure Analyzers Service Guide
Analog/Digital IF Troubleshooting
25 MHz BW IF Section
8. To continue verifying press FREQ, Zero Span. Verify the input attenuator
on the analyzer is set to 10 dB. (Look near the top of the display near the
center and verify Atten: 10 dB)
9. Refer to Figure 7-9, carefully disconnect W12 at A3J14.
Figure 7-9 A3 Digital I.F. Cables
10.Connect the W12 cable to the MMCX female to SMA female connector.
Use an appropriate cable to go from the SMA connector to the RF input of
a functioning spectrum analyzer.
11.Press Freq, 10 MHz, Span, 1 MHz, Peak Search on the functioning
spectrum analyzer.
If the analyzer is not in 10 dB of input attenuation press AMPTD,
Attenuation, Mech Atten 10 dB.
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