Troubleshooting A High Band Problem - Keysight Technologies X Series Service Manual

RF Section Troubleshooting (Millimeter-Wave Analyzers)
Troubleshooting

Troubleshooting a High Band Problem

Refer to the RF Highband Path #1 Block Diagram (Option 532, 544) in Chapter
12 and follow the instructions in the settings box. To enable the internal
4.8 GHz, −28 dBm calibrator signal press Input/Output, RF Calibrator,
4.8 GHz.
A13 Front End Input Verification
Disconnect W46 (if Option MPB is installed) or W7 (if Option MPB is not
installed) from A13J9 See Figure 5-10 for location of connector. Loosen the
other end of W46 or W7 if possible to avoid damaging the cable. Attach a right
angle SMA adapter to W46 or W7 and measure the input to the A13 Front End
with a spectrum analyzer.
Figure 5-10 A13J9 Location
Expected signal is 4.8 GHz at −51 dBm ± 4 dB. The tolerance is large because
the A12 YTF (microwave preselector) loss varies between devices, and the YTF
may not be perfectly aligned, or the frequency response adjustment may be
required.
If the signal level is incorrect, and Option MPB (Microwave Preselector Bypass)
is installed, press Amplitude, More, uWPath Control, uW Preselector Bypass.
If the signal level is now −52 dBm, suspect the A12 YTF is out of adjustment or
faulty.
226 Keysight N9010A EXA Service Guide