Keysight N9038A, Руководство по обслуживанию

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Keysight N9038A MXE Service Guide 187
RF Preselector Section
RF Preselector Section Troubleshooting
15. Connect a signal generator to the A21 RF Preselector Input assembly
Radiated Band Filtered Input (J306), as shown in
Figure 5-4 .
16. Tune the signal generator to 100 MHz with an amplitude of
−
20 dBm.
17. Tune the spectrum analyzer to a frequency of 100 MHz with a span of
10 MHz.
18. Tune the instrument to a frequency of 100 MHz with a span of 0 Hz by
pressing FREQ , 100 MHz , and SPAN , Zero Span .
19. Verify that the signal level on the spectrum analyzer is at
−
20 dBm (±3 dB),
as shown in Figure 5-14 , allowing for any additional test cable loss.
If the signal level is incorrect the most likely cause of the problem is the
A21 RF Preselector Input assembly itself.
Figure 5-14 A21 RF Preselector Input Assembly - Radiated Band Output
20. Turn on the Marker Delta function of the spectrum analyzer being used.
21. Turn the instrument Preamp on by pressing AMPTD , More , Internal
Preamp , Low Band .
Connection to A21J306 will require the use of a Type-M adapter or a Type-M to BNC cable, part
number N9039-60034.