Keysight N9038A MXE Service Guide 331
Analog & Digital IF
A2 Analog I.F. Troubleshooting
3. Remove W17 from the A3 Digital IF assembly J19 as shown in Figure 10-2.
4. Connect the end of W17 to a spectrum analyzer tuned to 22.5 MHz.
5. Turn the instrument self-alignment routine off by pressing System,
Alignments, Auto Align, Off.
6. Tune the instrument to a center frequency 50 MHz and a span of 0 Hz by
pressing FREQ, 50 MHz and Span, Zero Span.
7. Lock the instrument input attenuation to 10 dB by pressing AMPTD,
Attenuation, Mech Atten, 10 dB Man.
8. Connect a sine wave signal generator to the instrument input.
9. Tune the signal generator to 50 MHz with an amplitude of -20 dBm.
10.Set the instrument resolution bandwidth to 3 MHz by pressing BW 3 MHz.
11.Set the spectrum analyzer span to 40 MHz
12.Set the spectrum analyzer such that trace 1 is in Clear Write and trace 2 is
in Maxhold.
13.Vary the frequency of the signal generator above and below 50 MHz until
the resolution bandwidth filter shape has been drawn out on the
spectrum analyzer screen as shown in Figure 10-5.
14.Repeat steps 9 through 13 for the remainder of the Filter Paths listed in
Table 10-5 with the Resolution Bandwidth and Spectrum Analyzer Span
listed in the table.
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