Keysight N9038A Service Guide

140 Keysight N9038A MXE Service Guide
Input Selection & Level Control
Input Selection & Level Control Section Troubleshooting
12.Verify that the signal level on the spectrum analyzer is at −20 dBm
(±0.25 dB), as shown in Figure 4-6, allowing for any additional test cable
loss.
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 4-6 A9 Attenuator A AC/DC Input Coupling
13.Turn on the Marker Delta function of the spectrum analyzer being used.
14.Change the instrument input coupling to AC by pressing Input / Output,
RF Input, RF Coupling AC.
15.Verify that the signal level on the spectrum analyzer drops by at least 5 dB
from where it was when the RF Coupling was set to DC, as shown in Figure
4-6.
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.

Keysight N9038A Specifications

General

Brand	Keysight
Model	N9038A
Category	Measuring Instruments
Language	English