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SDS2000X HD Series Digital Oscilloscope User Manual
i n t . s i g l e n t . c o m 1 9 3
Windows
Spectral leakage in FFTs can be considerably decreased when a window is used. SDS2000X HD
provides five windows that have different characteristics and apply to different scenarios.
For example, for a two-tone signal with a very close frequency interval, it is suitable to use a Rectangle
window with the best frequency resolution. For the case where the accuracy of amplitude
measurement is critical, it is recommended to select the 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
4π/N -13 dB 3.9 dB
Hanning Better frequency resolution
Poor amplitude resolution
8π/N -32 dB 1.4 dB
Hamming Better frequency resolution
Poor amplitude resolution
8π/N -43 dB 1.8 dB
Blackman Poor frequency resolution
Better amplitude resolution
12π/N -58 dB 1.1 dB
Flattop The worst frequency resolution
The best amplitude resolution
23π/N -93 dB < 0.1dB
Display Mode
Split: Time-domain waveform and frequency domain waveform are displayed separately. The
time-domain waveform is on the upper half screen, while the frequency domain waveform is
located within the lower half of the display. In Split mode, if Zoom is enabled, the zoomed
waveform and the frequency domain waveform are displayed on the lower half screen together.
Full Screen: Time-domain waveform and frequency-domain waveform are displayed together.
Exclusive: Only the frequency-domain waveform is displayed.
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