N9030B PXA Signal Analyzer Service Guide 243
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 PXA Signal Analyzer. Refer to Chapter 16,
“Assembly Replacement Procedures”, on page 429 in this service guide.
3. Turn the instrument over so that the bottom side of the analyzer is facing
up.
4. Turn on the PXA 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 147 in this service guide.
9. To continue verifying press Meas, IQ Waveform. Verify the input
attenuator on the PXA 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 7-11, carefully disconnect W26 or W40 (if analyzer is
also equipped with Opt B1X) from A3J15.
Perform this procedure only if the analyzer is equipped with Option B40,
Analysis Bandwidth, 40 MHz.
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