268
Analog/Digital IF Troubleshooting
40 MHz BW IF Section
Verifying the 250 MHz IF Input Power (Option B40 only)
NOTE Perform this procedure only if the analyzer is equipped with Option B40,
Analysis Bandwidth, 40 MHz
1. Perform an instrument shutdown.
2. Remove the cover of the analyzer. Refer to Chapter 14, “Assembly
Replacement Procedures” in this service guide.
3. Turn the instrument over so that the bottom side of the analyzer is facing
up.
4. Turn on the 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,
1MHz, Peak Search on the analyzer. The marker readout should be 50
MHz at −25 dBm ± 3 dB. If this reference signal is measuring incorrectly,
see Chapter 4, “RF Section Troubleshooting” in this service guide.
9. To continue verifying press Meas, IQ Waveform. Verify the input
attenuator on the analyzer 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
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