Keysight N9038A, Service Manual, Page: 142 / 745

142 Keysight N9038A MXE Service Guide
Input Selection & Level Control
Input Selection & Level Control Section Troubleshooting
Attenuation Selection
20. Turn on the Marker Delta function of the spectrum analyzer being used.
21. Change the A9 Attenuator A setting to 2 dB by pressing AMPTD ,
Attenuation , Mech Atten , 2 dB .
22. Verify that the signal level on the spectrum analyzer drops by 2 dB from
where it was, as shown in Figure 4-8 .
If the signal level is incorrect the most likely cause of the problem is the A9
Attenuator A assembly itself. However, before replacing an A9 Attenuator
A assembly for any failure, refer to Chapter 8, “Front End Control.” for
information on how to verify the control signals to it.
Figure 4-8 A9 Attenuator A
−
2 dB
23. Change the A9 Attenuator A setting to 4 dB by pressing AMPTD ,
Attenuation , Mech Atten , 4 dB .
24. Verify that the signal level on the spectrum analyzer drops by 4 dB from
where it was, as shown in Figure 4-9 .
If the signal level is incorrect the most likely cause of the problem is the A9
Attenuator A assembly itself. However, before replacing an A9 Attenuator
A assembly for any failure, refer to Chapter 8, “Front End Control.” for
information on how to verify the control signals to it.