User manual

WaveSurfer 3000 Oscilloscopes
Window Type Applications and Limitations
Rectangular These are normally used when the signal is transient (completely contained in the time-domain window)
or known to have a fundamental frequency component that is an integer multiple of the fundamental
frequency of the window. Signals other than these types will show varying amounts of spectral leakage
and scallop loss, which can be corrected by selecting another type of window.
Hanning (Von Hann) These reduce leakage and improve amplitude accuracy. However, frequency resolution is also reduced.
Hamming These reduce leakage and improve amplitude accuracy. However, frequency resolution is also reduced.
Flat Top This window provides excellent amplitude accuracy with moderate reduction of leakage, but with reduced
frequency resolution.
Blackman-Harris It reduces the leakage to a minimum, but with reduced frequency resolution.
FFT Window Filter Parameters
Window Type Highest Side Lobe (dB) Scallop Loss (dB) ENBW (bins) Coherent Gain (dB)
Rectangular -13 3.92 1.0 0.0
Von Hann -32 1.42 1.5 -6.02
Hamming -43 1.78 1.37 -5.35
Flat Top -44 0.01 3.43 -11.05
Blackman-Harris -67 1.13 1.71 -7.53
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