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Window
Characteristics
Function
Best amplitude resolution
Blackman-
Harris
Poorest frequency resolution
Better frequency resolution and
Hanning
poorer amplitude resolution
compared with Rectangular
A little bit better frequency
Hamming
resolution than Hanning
Flattop
Measure the signals accurately
Triangle
Better frequency resolution
Color Grade
Click or tap the Color Grade on/off switch to enable/disable the color grade display
of FFT operation results. When 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.
Peak Search
Click or tap the icon
menu, as shown in the figure below.
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15
10
20
5
25
0
30
Waveforms Applicable to the
Window Function
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
at the right side of Peak Search to enter the peak search
Math Operation
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DHO1000 User Guide
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