Non-Harmonic Spurious Responses are unwanted signals that are not related to the fundamental output frequency of the DUT. They are produced by the internal frequency synthesis of the DUT. This test utilizes a spectrum analyzer to measure the amplitude of these responses relative to the amplitude of a fundamental frequency.
The spectrum analyzer and the signal generator are both tuned to the harmonic frequency and a reference amplitude measurement is made. Then, the signal generator is tuned to the fundamental frequency with the power level unchanged. The spectrum analyzer measures the resulting harmonic response relative to the reference amplitude. For spurious signals close to the fundamental where phase noise dominates over thermal noise, an additional noise measurement is made to correctly determine the measurement uncertainty due to noise.
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 Non-Harmonic Spurious
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.