Math FFT
Selecting an F
FT Window
Windows reduce spectral leakage in the FFT spectrum. The FFT ass umes 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 and end
points cause discontinuities in the signal that introduce h igh-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.
58 TDS2000C and TDS1000C-EDU Series Oscilloscope User Manual
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