Extech Instruments MS6000 Manual

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32 MS6000-EU-EN V1.4 8/12

4.3.1.3 Selecting FFT Window

Using FFT windows can eliminate the spectral leakage in the FFT spectrum. The FFT algorithm

assumes that the YT waveform repeats all the time. When the number of cycles is integral (1, 2, 3 ...),

the YT waveform starts and ends at the same amplitude and there are no discontinuities in the signal

shape.

If the number of cycles is non-integral, the YT waveform starts and ends at different amplitudes and the

transitions between the start and end points will cause discontinuities in the signal that introduce

high-frequency transients.