[quote user="ABHISHEK PARIKH"]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. [/quote] That means your effective sampling rate is actually 5000*(16/100)= 800 samples/second . You have collected but discarded the other 5000-800=4200 samples/second. The 7th and higher harmonic is 7*50=350 Hz and higher. You are destined to get unacceptable results when you only use 800 samples/second.
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