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Following our example, the above picture shows the FFT of the measurement. Y axis represents signal strenght and X axis represents the FFT sample. Note that only the 300 first samples are shown.
We can see a dominant peak centered about sample number 16.This peak should correspond to the measured dominant sinus of 4,609KHz on time domain graphic.<br>
The sampling rate used by the equipment with the default modulation is 590Ksps. This means that each sample of the FFT represents 590000/2047=288,2Hz.