Selecting Fft Window - Extech Instruments MS6100 User Manual

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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.
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