How to analyze this waveform to find out the point

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?
Attachments:
æªå½å.JPG ‏44 KB

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

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How to analyze this waveform to find out the point

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