FFT
Selecting an F
FT Window
Windows reduce spectral leakage in the FFT spectrum. The FFT assumes that
the YT waveform repeats forever. With an integral number of cycles (1, 2, 3,
...), the YT w
aveform starts and ends at the same amplitude and there are no
discontinuities in the signal shape.
A non-integ
ral number of cycles in the YT waveform causes the signal start and
end points to be at different amplitudes. The transitions between the start a nd end
points cause discontinuities in the signal that introduce high-frequency transients.
Applying a window to the YT waveform changes the waveform so that the start
and stop values are close to each other, reducing the discontinuities.
54 TBS1000B and TBS1000B-EDU Series Oscilloscopes User Manual
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