Keysight Technologies N9040B UXA Signal Analyzer Service Guide 203
Analog/Digital IF Troubleshooting
A3 Digital IF Troubleshooting
Verifying the 250 MHz IF Input Power (Option B40 only)
1. Perform an instrument shutdown.
2. Remove the cover of the UXA Signal Analyzer. Refer to Chapter 15,
“Assembly Replacement Procedures”, on page 347 in this service guide.
3. Turn the instrument over so that the bottom side of the analyzer is facing
up.
4. Turn on the UXA Signal Analyzer and wait for the instrument to complete
the boot up process.
5. Press Mode, IQ Analyzer (Basic), Mode Setup, IF Path, 40 MHz.
6. Press System, Alignments, Auto Align, Off.
7. Press Input/Output, RF calibrator, 50 MHz.
8. Verify the 50 MHz signal is at −25 dBm by pressing FREQ, 50 MHz, SPAN,
1 MHz, Peak Search on the analyzer. The maker readout should be 50 MHz
at −25 dBm ± 3 dB. If this reference signal is measuring incorrectly, see
Chapter 4, “RF Section Troubleshooting (RF/Microwave Analyzers)”, on
page 139 in this service guide.
9. To continue verifying press Meas, IQ Waveform. Verify the input
attenuator on the UXA is set to 10 dB. Look near the top of the display
near the center and verify Atten: 10 dB is visible. If needed change the
input attenuator by pressing AMPTD, Attenuation, 10 dB on the analyzer
10.Referring to Figure 6-11, carefully disconnect W26 from A3J15.
Perform this procedure only if the analyzer is equipped with Option B40, Analysis Bandwidth,
40 MHz
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