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SDS5000X Series Digital Oscilloscope User Manual
163 / 236 W W W. S I G L E N T. C O M
Windows
Spectral leakage in FFT can be considerably decreased when a window is used.
SDS5000X provides five windows which have different characteristics and are
applicable to different scenarios.
For example, for a two-tone signal with very close frequency interval, it is
suitable to use Rectangle window with the best frequency resolution. For the
case where the accuracy of amplitude measurement is critical, it is
recommended to select Flattop window with the best amplitude resolution.
Window
Characteristics
Main lobe
width
Side lobe
suppression
Maximum
amplitude
error
Rectangle
The best frequency
resolution
The worst
amplitude
resolution
It is equivalent to
the case of no
window
23 is
-13 dB
3.9 dB
Hanning
Better frequency
resolution
Poor amplitude
resolution
8oor
-32 dB
1.4 dB
Hamming
Better frequency
resolution
Poor amplitude
resolution
8oor
-43 dB
1.8 dB
Blackman
Poor frequency
resolution
Better amplitude
resolution
12π/N
-58 dB
1.1 dB
Flattop
Poor frequency
resolution
23mpl
-93 dB
< 0.1 dB
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