Table 9.1 Window Function - Rigol DHO900 Series User Manual

measured. Click or tap the Window drop-down button to select the desired window
function.

Table 9.1 Window Function

Window
Function
Rectangular
Blackman-
Harris
Hanning
Hamming
Flattop
Triangle
Color Grade
Click or tap the Color Grade on/off switch to enable/disable the color grade display
of FFT operation results. When it is enabled, different colors are displayed on the
screen to indicate the times of data acquisition or acquisition probability. Click or tap
the Reset button for the Color Grade menu to clear the color grade display and
display the color grade again.
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Characteristics
Best frequency resolution
Poorest amplitude resolution
Similar to the situation when no
window is applied
Best amplitude resolution
Poorest frequency resolution
Better frequency resolution and
poorer amplitude resolution
compared with Rectangular
A little bit better frequency
resolution than Hanning
Measure the signals accurately
Better frequency resolution
Math Operation
Waveforms Applicable to the
Window Function
Transient or short pulse, the signal
levels before and after the
multiplication are basically the same
Sine waveforms with the same
amplitudes and rather similar
frequencies
Wide band random noise with
relatively slow change of waveform
spectrum
Single frequency signal, searching
for higher order harmonics
Sine, periodic, and narrow band
random noise
Transient or short pulse, the signal
levels before and after the
multiplication are rather different
Measure the signal that has no
accurate reference and requires an
accurate measurement
Measure the narrow band signal
and that has strong noise
interference
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