FFT analysis: SNR and Noise level vary with FFT Window size

Re: FFT analysis: SNR and Noise level vary with FFT Window

Postby VirtinsTech » Sun Oct 13, 2019 3:14 am

Thanks for the information. This crash issue has actually been fixed internally during our MI 3.9 development. It only happens when the spectrum analyzer is open but oscilloscope is closed, and FFT size has just been changed while ADC is not running. A temporary workaround is to change FFT size with ADC running always. If you change FFT size with oscilloscope window opened, then Record Length will not change with FFT size. If Record Length < FFT Size, zero-padding will be used. If Record Length > FFT size, intra-frame average will be used. The number of averages will be displayed as "FFT segments" at the bottom left corner of the spectrum analyzer window.
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