Keysight NFA Series Noise Figure Analyzers Service Guide 263
Analog/Digital IF Troubleshooting
25 MHz BW IF Section
A3 Digital I.F. Troubleshooting
Verifying the 22.5 MHz Input Power
1. Perform an instrument shut down.
2. Remove the cover of the analyzer. Refer to Chapter 15, “Assembly
Replacement Procedures”, on page 389 in this service guide.
3. Turn the instrument over so that the bottom is facing up.
4. Turn on the analyzer and wait for the instrument to complete the boot up
process.
5. Press System, Alignments, Auto Align, Off
6. Press Input, RF Calibrator, 50 MHz
7. Verify the 50 MHz signal is at −25 dBm by pressing MODE/MEAS,
Spectrum Analyzer, OK, FREQ, 50 MHz, Span, 1MHz, Peak Search on the
analyzer. The marker readout should be 50 MHz at −25 dBm ± 3 dBm. If
this reference signal is measuring incorrectly, see Chapter 4, “RF Section
Troubleshooting (N8973B, 74B, 75B Analyzers)”, on page 133 in this
service guide.
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)
If the analyzer is not in 10 dB of input attenuation press AMPTD,
Attenuation, Mech Atten 10 dB.
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