IMD is measured by examining the output of a Device Under Test (DUT) with a spectrum analyser while the DUT is being stimulated with a two-tone-rf test signal. Usually the odd (IMD3, IMD5,...) products are observed, because they fall back into the spectrum of interest.

In order to measure this, you will need two RF generators. Make sure their output is combined therefore, that they don't "see" each other.

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