Assume your sampling frequency (fs) is 500 hz. if you want to capture the 50hz signal for 5 seconds, calculate the number of samples (n) at the assumed fs to get the desired 5 seconds of data.

N = 2500

Explanation:

By definition, the sampling frequency (fs) is:

where N: is the number of samples and T: is the time

Hence, the number of samples at the sampling frequency, 500 Hz, to get 5 seconds of data is:

I hope it helps you!                        

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