Tektronix TDS1000- Manuel d'utilisateur Page 138

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Math FFT
120
TDS1000/2000-Series Digital Oscilloscope User Manual
Selecting an FFT Window
Windows reduce spectral l eakage in the FFT spectrum. The FFT
assumes that the YT waveform repeats forever. With an integral
number of cycles (1, 2, 3, ...), the YT waveform starts and ends at the
same amplitude and there are no discontinuities in the signal shape.
A non-integral number of cycles in the YT waveform causes the
signal start and end points to be at di fferent a mplitudes. The
transitions between the start and end points cause discontinuities in
the signal that introduce hi gh-frequency transients.
Time-domain
(YT) waveform
Without windowing
FFT
Discontinuities
Center 2048
data points
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