Residual AM measures the amount of amplitude modulation present on a CW signal.
The spectrum analyzer is placed in zero span, and a time-domain measurement is made of the signal generator's input signal. The minimum and maximum amplitude of the waveform is measured for the given detection bandwidth, and the amplitude modulation calculated from these measurements.
Test Equipment |
Recommended Models |
Alternative Models |
Spectrum Analyzer |
N9030B Opt 5xx1 |
N9030A Opt 5xx1 E444xA2 |
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Connect all test equipment as shown.
Connect GPIB cables to all GPIB-controlled test equipment.
While performing this performance test, follow all instructions on the controller display.
Setup for Residual AM
If this performance test fails, perform the following steps in order:
Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the Performance Test.
If this test fails with the equipment set up properly, refer to the troubleshooting section of the signal generator's service guide. If you do not have a printed copy of the service guide (Option OBW), one is available either on the CD-ROM that came with your signal generator shipment or on the Keysight Website.
If you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.