N9030B PXA Signal Analyzer Service Guide 329
Hardware Options
A26 Wideband Digital IF Troubleshooting - Option B1X and B85
A26 Wideband Digital IF Troubleshooting - Option B1X and B85
Verify the Wideband Signal Path
Normally failure of this assembly will occur during extensive alignments. Verify
if there are alignment error related to the WBDIF located in the
E:\AlignDataStore\AlignmentHistrory.txt files.
If errors are found related to WBDIF replace the A26 Wideband Digital IF
assembly. To troubleshoot this module set the instrument up as below:
1. Turn on the signal analyzer and wait for the instrument to complete the
boot up process.
2. Press System, Alignments, Auto Align, Off.
3. Press Mode, IQ Analyzer
4. Press Meas, Complex Spectrum
5. Press Input/Output, RF Calibrator, 50 MHz
6. Press Span, 10 MHz
7. Press Mode Setup, IF Path, 85 MHz or 160 MHz.
8. 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.
9. If this signal is not present, determine if the issue is only present with the
Wideband 85 MHz or 160 MHz path. Press Mode Setup, IF Path, 40 MHz. If
the signal is now present, there is a likely failure of the A26 Wideband
Digital IF or the A25 Wideband Analog IF
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