Bedienungsanleitung / Operation manual 30 MHz Digital ...
Bedienungsanleitung / Operation manual 30 MHz Digital ...
Bedienungsanleitung / Operation manual 30 MHz Digital ...
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Hamming<br />
Hanning<br />
Blackman<br />
This is a very good window for resolving frequencies that<br />
are very close to the same value with somewhat<br />
improved amplitude accuracy over the rectangle window.<br />
It has a slightly better frequency resolution than the<br />
Hanning.<br />
Use Hamming for measuring sine, periodic and narrow<br />
band random noise. This window works on transients or<br />
bursts where the signal levels before and after the event<br />
are significantly different.<br />
This is a very good window for measuring amplitude<br />
accuracy but less so for resolving frequencies.<br />
Use Hanning for measuring sine, periodic and narrow<br />
band random noise. This window works on transients or<br />
bursts where the signal levels before and after the event<br />
are significantly different.<br />
This is the best window for measuring the amplitude of<br />
frequencies but worst at resolving frequencies.<br />
Use Blackman-Harris for measuring predominantly<br />
single frequency waveforms to look for higher order<br />
harmonics.<br />
Fig. 20, 21, 22 and 23 show four kinds of window function referring to sine wave of 1 KHz under the selection<br />
of four different windows for FFT:<br />
Fig. 20 Rectangle window<br />
-110-