19 April 2021 2 3K Report

Hi, This is Jeon

I usually use "Vibrationdata.m" by Tom Irvine to plot the waterfall of STFT.

I selected each value for STFT as following (window, plot frequency etc.).

I don't know why the peak is appeared at 1.2207Hz.

I guess, the reason is that I set that df(Hz) is 1.2207Hz. Therefore, the signal can be showed from 1.2207Hz. But, I set the plot frequency to 1Hz.

my opinion is correct?? In this case, what should I do?

Thank you.

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