how to calculate harmonic current of AC input current

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alphi

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I want to build a harmonic current meter for power supply testing,I use AD converter to sample AC input current ,but how can i calculate harmonic current ? what is the formulate? how to use FFT?
 

I have seen a hardware version of this with a notch filter at the main frequency and high pass and low pass filters as well. The output was amplified and rectified. The source of the signal was from a clamp on current transformer.

I suspect that you could do the same thing in DSP.
 

Thank you!
But I need to known how to calculate harmonic current from sampled data.
 

You can use switch capasitor filter and scan your frequency band..maxim has that chips(max 8 order) but these chips has 20Khz BW.
 

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