How to find the time to what zero crossing point occur using zero crossing vi

Hello 
Im trying to find the time to the point of inflection of a Bio-Signal with the 2nd derivative, then detecet the point of zero of the derivative signal
What I need, is to mark the point of inflection on my Bio-Signal at the point where the derivative signal crosses the zero.

The second has two scales on the graph, one on each side.  The first has only a single scale. I do not change the name of VI, so both have the same name.

Lynn

Tags: NI Software

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