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Setting
up Compax3
C3I20T11 / C3I32T11
252
192-120103 N13 C3I20T11 / C3I32T11 December 2010
Leak effect and windowing
If frequencies not corresponding to the frequency resolution are present in the
analyzed spectrum, the so-called leak effect can be caused.
Display of the leak effect with the aid of a 16 point discrete Fourier transformation
Complete oscillation period in the scanning
period
Envelope without leak effect
Non complete oscillation period in the scanning
period
Envelope with leak effect
Sine at 200Hz without windowing
Consequence of the leak effect shown at the example of a sine signal.
(fA=4000Hz; N=500; =>
∆
f=8Hz
f0=200Hz = 25*
∆
f frequency corresponds to the frequency-resolution
The sine frequency is exactly on a multiple of the frequency resolution (200Hz /
8Hz=25). The spectrum is clearly separated and there are no leak effects visible.