This test measures the third-order intermodulation distortion of the instrument and verifies that it meets the published specifications. Two signal sources are required and are provided by a signal generator and a swept signal generator. The outputs from the sources are combined through a directional bridge, used for isolation, and applied to the VSA. Using a power meter, the amplitude of the source signal is measured as a reference for the rest of the test.
With the source frequencies set 50 kHz apart, the upper and lower distortion products are measured. Then with the source frequencies set 5 MHz apart, the upper and lower distortion products are measured again. The highest amplitude product from each pair of measurements is compared to the specification for the instrument.
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Related adjustment: None
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Test Equipment |
Recommended Model Number |
|---|---|
|
RF Source 1 |
E8257D |
|
Secondary source |
33250A function generator |
|
Power meter |
N1914A |
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Power sensor |
N8482A |
|
Directional bridge |
86205A |
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Low pass filter, 50 MHz |
0955-0306 |
|
Cable, BNC |
8120-2582 |
|
Adapter, Type-N (f) to BNC (m) |
1250-1477 |
|
Adapter, Type-N (m) to BNC (f) |
1250-1476 |
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