120 E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Performance Test Problems
Troubleshooting Performance Test Problems
If a performance test fails and all self–tests pass, use the following to find the
most likely failure:
Performance test that is failing... Action to perform...
Maximum Leveled Output Power Refer to “Troubleshooting the RF Path” on page 122.
Power Level Accuracy Perform
Power Flatness Calibration,
Attenuator Calibration–Lowband and Highband Power,
Attenuator Calibration–Highband and High Power,
Attenuator Calibration–Lowband and Low Power, and
Attenuator Calibration–Highband and Low Power.
Internal Pulse Modulation Level Accuracy
Internal Pulse Modulation Rise/Fall Time
Internal Pulse Modulation Minimum Pulse Width
If the frequency ≤3.2 GHz, check the
A11 Pulse/Analog Modulation Generator or the A8 Output.
If the frequency is >3.2 GHz, check
A11 Pulse/Analog Modulation Generator and the A10 ALC.
If the Internal Pulse Modulation Minimum Pulse Width test fails,
perform a Pulse Width Calibration prior to replacing any assembly.
DC FM Carrier Offset Perform DC FM Calibration.
If still failing, check A11 Pulse/Analog Modulation Generator and A6 Frac–N.
External AM Frequency Response If the frequency is ≤3.2 GHz, check the
A11 Pulse/Analog Modulation Generator or the A8 Output.
If the frequency is >3.2 GHz, check the
A11 Pulse/Analog Modulation Generator and the A10 ALC.
Internal FM Frequency Response Perform FM adjustments.
If still failing check A11 Pulse/Analog Modulation Generator and A6 Frac–N.
External Phase Modulation Frequency Response Perform FM adjustments.
If still failing check A11 Pulse/Analog Modulation Generator and A6 Frac–N.
Internal FM Distortion Perform FM adjustments.
If still failing check A11 Pulse/Analog Modulation Generator and A6 Frac–N.
Internal Phase Modulation Distortion Perform FM adjustments.
If still failing check A11 Pulse/Analog Modulation Generator and A6 Frac–N.
External FM Deviation Accuracy Perform FM adjustments.
If still failing check A11 Pulse/Analog Modulation Generator and A6 Frac–N.
External Phase Modulation Deviation Accuracy Perform FM adjustments.
If still failing check A11 Pulse/Analog Modulation Generator and A6 Frac–N.
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