Determine a start point of a cycle and extract one cycle, or multiple

[IAERandy]

I have a waveform/pulse close to a square wave signal (1D array of points) with some ripples.  I need to automatically determine a start point of a cycle to measure the first ripple and then determine a second point to analyze the remaining ripples.  The X, Y data points can very, because I am using cursors to pull data from the initial array and zoom in on one pulse/square wave.

[Sneff]

Are the high and low phases distinguishable by a threshold value?

[Pie56694]

Hi IAERandy,

It would help me greatly to see the measurement of interest.  Would you please post a picture of your signal, and indicate the points that you'd like to measure.  You can draw it in paint if you like.  You can also take a look at this post.