How to find the time at which zero crossing point happen using zero crossing vi

[laythzraiqat]

Im trying your VI on a signal and it's not detecting the diachrotic notch

[layth]

will you provide me more information about how the For loop in the block works   ?

[johnsold · Accepted solution]

For reference here is the part of the code I think you are asking about.

The subVI in the upper left is Savitsky-Golay Diff&Smooth.vi. The Greater than Zero and Implies find the zero crossings of the second derivative.  The case structure creates an output array which contains the values of the smoothed signal only at the second derivative zero crossings and NaN in all other elements. This creates the dots on the graph.

Lynn

[laythzraiqat]

I really want to thank you 
ThanK you Very much 
so much respect for you