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how to find the real-time Zero point location ?

I want to get a real-time phase difference between current and voltage waveform with the same harmonic frequency.for this reason I must know real-time zero or peak location.could you tell me how to do it?
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The best way to do phase difference analysis is by using one of the Simultaneous Multifunction I/O DAQ boards, such as the 6110.

That board has one ADC per channel, meaning that the acquisition is trully simultaneous. If you hook up the voltage waveform to one channel and the current waveform (through a resistor) to another, you can see the phase difference in a simple graph.

Hope this helps.
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