Filter
Top Products
Math FFT
120
TDS1000/2000-Series Digital Oscilloscope User Manual
Selecting an FFT Window
Windows reduce spectral leakage in the FFT spectrum. The FFT
assumes that the YT wave form re peats 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 t o be at different amplitudes. The
transitions between the start and end points cause discontinuities in
the signal that introduce high-frequency transients.
Time-domain
(YT) waveform
Without windowing
FFT
Discontinuities
Center 2048
data points