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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 1-76.
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.
External Pulse Modulation ON/OFF Ratio 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.
Harmonic Spurious Refer to “Troubleshooting Harmonic Spurious” on page 1-80.
Sub-Harmonic Spurious Refer to “Troubleshooting Harmonic Spurious” on page 1-80.
Non-Harmonic Spurious Refer to “Troubleshooting Non–Harmonic Spurious” on page 1-83.
Single-Sideband Phase Noise Refer to “Troubleshooting the RF Path” on page 1-76.
Internal EVM Digital Modulation Quality Perform I/Q and digital calibrations.
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