162 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
To perform the YTF alignment, reconnect W15 cable, and press System,
Alignments, Advanced, Characterize Preselector. The routine may take
several minutes to align the YTF. Display the 4.8 GHz calibrator signal on
screen as explained in the quick check section. If the signal level is still
incorrect, suspect all assemblies, cables, switches and the A16 Reference
calibrator signal between the W15 cable and the input to the A9 Attenuator.
Figure 4-11 RF Section
A9 Input Attenuator A and A10 Input Attenuator B Verification
Calibrator Switch Test
On the A16 Reference assembly, disconnect semi rigid cable W3 from A16J701
and measure A16J701 with a spectrum analyzer. Expected signal is 4.8 GHz at
−28 dBm ± 0.5 dB. If signal level is incorrect, suspect A16 Reference Assembly.
To verify calibrator switch operation, connect external signal source set to
4.8 GHz and −25 dBm to the RF input connector of analyzer under test. Press
Input/Output, RF Calibrator, Off. If the signal level at the attenuator output is
now correct, suspect the A9 Attenuator cal switch or a faulty control signal
from the A15 Front End Controller assembly.
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