Hello old_cow_yellow , It means 5000 samples/second Frequency is 50Hz so for each wave I get 100 samples. I was doing 16 point FFT so I select 16 samples from 100 samples wave like (1st,6th,13th..etc) So I get 16 point FFT response. For pure sine wave it should give zero but as I am taking only 16 samples because of this low rate error occurs and it gives me harmonics. Now I am trying it with Goertzel Algorithm. Thanks for the reply Regards Abhishek
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