how to analyze this waveform to find out the point

[moonstar]

The current waveform as the following attachment ,How can I analyze it to find out the point a in order to calculate the different current rms between it?

[Evan]

You can use the peak detect VI to find all the peaks and their amplitudes.  Then simple search it to see when the value changes.  You then know the region that has the 0 in it and you can pull that out.

[Jessica_Feng]

The same question as mention with this link:http://forums.ni.com/ni/board/message?board.id=2170&message.id=8831&jump=true