Math Key -> Operator -> FFT -> Window Softkey help information Applies a window to the FFT input signal. * Rectangular - Best frequency resolution but worst amplitude accuracy. Excellent to measure a transient signal where the signal levels before and after the event are nearly the same. * Hanning - Good frequency resolution, low spectral leakage, and fair amplitude accuracy. Useful for measuring transients or bursts where the signal levels are significantly different before and after the event. * Hamming - Better frequency resolution, moderate spectral leakage, and fair amplitude accuracy. Suitable to look at sine, periodic, and narrow bank spectral noise. * Blackman - Worst frequency resolution, low spectral leakage, and good amplitude accuracy. Mainly to measure single frequency signal to detect higher-order harmonics. * Bartlett - Similar to Hanning but with higher and wider secondary lobes. Good to measure the narrowband signals with strong noise interference. * Flattop - With highest amplitude flatness. Used to make accurate amplitude measurements of frequency peak.
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