Be equivalent to no use of
window
constant-amplitude sine waves with
nearly equal frequency.
Hanning
Better frequency
resolution and worse
amplitude resolution in
comparison with
rectangular window
Sine, period and narrow-band random
noise.
Hamming
Frequency of window
Hamming is a little better
than that of window
Hanning
Transient or short pulse where the
signal electric levels are considerably
different there-before and there-after
Blackman
Best amplitude resolution
Worst frequency resolution
Single-frequency signal, find higher
subharmonic
Carry out the following steps to use FFT mode:
Set time domain waveform
Access the signal to CH1 or CH2, and press [AUTO] to display a YT waveform.
Manually regulate the waveform display if necessary so as to ensure that the
waveform does not surpass the screen and the screen displays a plurality of
periods.
According to Nyquist law, revolve [s/div] to make the sampling rate at least two
times the frequency of the input signal.
Display FFT spectrum
Press [MATH].
Select “Operation” as “FFT”.
Select the signal source as “CH1”or “CH2”.
Select a suitable window function.
Regulate spectrum amplitude gear and offset at page 2 of the FFT function menu
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