242 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Hardware Options
A21 Wideband Analog IF Troubleshooting
A21 Wideband Troubleshooting
Verify the J17 IF Input level
1. Turn the instrument off.
2. Remove the instrument enclosure and top brace covers. Refer to Chapter
15, “Assembly Replacement Procedures” in this service guide.
3. Turn on the signal analyzer and wait for the instrument to complete the
boot up process.
4. Press System, Alignments, Auto Align, Off.
5. Press Mode/Meas, IQ Analyzer (Basic), Complex Spectrum, OK
6. Press Input/Output, RF Calibrator, 50 MHz
7. Press Frequency hard key and set the center frequency to 50 MHz.
8. Press Meas Setup, IF Path. Tap IF Path and choose 255 MHz or 510 MHz
from the drop down menu. If Option B5X, 510 MHz, is installed, there is no
255 IF Path selection. Choose 510 MHz in this case.
9. Verify the 50 MHz signal is at −25 dBm on the analyzer display by pressing
Peak Search on the analyzer. The marker readout should be 50 MHz at
−25 dBm ±3 dB. See Figure 11-2. If this reference signal is measuring
incorrectly, see Chapter 4, “RF Section Troubleshooting (RF/Microwave
Analyzers)” in this service guide.
Figure 11-2 50 MHz Signal
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