182 Keysight N9038A MXE Service Guide
RF Preselector Section
RF Preselector Section Troubleshooting
10.Verify that the signal level on the spectrum analyzer is at −20 dBm (±1.5
dB), as shown in Figure 5-9, 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 5-9 A21 RF Preselector Input Assembly - Conducted Band Pre-Filter
Pre-Filter Shape Verification - Conducted Band
11.Placing one of the active traces on the spectrum analyzer into its Max
Hold function.
12.Slowly vary the frequency of the signal generator between 500 kHz and
100.5 MHz to draw out the shape of the conducted band pre-filter on the
spectrum analyzer display, as shown in Figure 5-9.
13.Verify that the filter shape on the spectrum analyzer display is similar to
that shown in Figure 5-9.
If the filter shape is incorrect the most likely cause of the problem is the
A21 RF Preselector Input assembly itself.
Input Signal Routing Verification - Radiated Band
14.Tune the signal generator to 1 GHz with an amplitude of −20 dBm.
15.Move the spectrum analyzer to the A21 RF Preselector Input assembly
Radiated Band Pre-Filtered Output (J102), as shown in Figure 5-4.
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