In the Normal Variant test plan, this test is called Noise Sidebands < 50 kHz Offsets.
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In the Normal Variant test plan, this test is called Noise Sidebands < 50 kHz Offsets. |
This test verifies that the E4406A VSA meets its Noise Sidebands specification for offsets less than 50 kHz from the center frequency. For units with a serial prefix of US4251/MY4251 or later, the Noise Sidebands are specified. For units with serial prefix lower than US4251/MY4251, Noise Sidebands are a nominal (unwarranted) parameter. For those units with a Noise Sidebands listed as a nominal parameter, this test is performed as a functional test using limits that are 10 dB relaxed from the nominal value.
In this test, the source is connected to the RF Input and the noise level is measured at offsets of 100 Hz, 1.0 kHz, and 10 kHz. In order to minimize the VSA DANL effects, near noise corrections are applied at each offset frequency. Near noise corrections involve measuring the noise sidebands with the RF signal On, and then measuring the DANL with the RF signal Off. Both measurements are then converted to power (in Watts), and the noise power is subtracted from the sideband power.
This test is performed in conjunction with the Noise Sidebands at > 50 kHz Offsets test
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If this test fails at 100 Hz offset while operating at a 50 Hz line frequency, the failure is most likely a power line related sideband. In order to verify the failure, the VSA should be tested while being operated from a 60 Hz power source. |
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Related adjustment: Synthesizer 2
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Test Equipment |
Recommended Model Number |
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RF Source 2 |
E8257D |
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Cable, Type-N |
11500C |
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Cable, BNC |
8120-2582 |
