Identifying 2nd and 3rd Loop in a Graph

[TITAN-x]

Hello everyone,

I have a question for those who are talented in signal analysis using LabVIEW. I have a graph (attached below) in which I have to identify the 2nd and the 3rd peak values as well as the width of the first peak that's marked as 'W' in the image. Is there any one who can help me with that?

[Yamaeda]

Check "Waveform peak detection"

/Y

[TITAN-x]

With the waveform peak detection I am able to get the first peak's value but not the second or the third ones. 

[Yamaeda]

You should get an array of peaks as output and should thus be able to get all analyzed peaks. Does this not work for you?

/Y

[daveTW]

You have to properly set the width- Parameter of the peaks. I was with these parameters successful:

Btw, there seem to be a bug in the copy-paste-function of the waveform graphs. On the FP the cursors are set correctly to the peak- values. I will post this in a different thread.

[TITAN-x]

That isso nice Dave, thanks. I actually need to identify the peaks programatically. So I guess I have to develop the program you share with me.

[TITAN-x]

Btw, below I share with you the actual vi I am working on. I need to identify the peak points for the reflection graph that is highlighted red in color. I hope now you have a better idea about what I am trying to do.

[daveTW]

Hello,

unfortunately I don't have LV2016 installed yet. Could you save ist as 2015- version?

[TITAN-x]

Hello Dave, Sure. I have attached 2015 version of the same program.

[daveTW]

This doesn't really help me, sorry. There is no data I can work with.

Please run the VI once, then when there is data shown in the waveform graph, right-click on it and select "Data Operation / Make Current Value Default". Then save the VI and post it again (LV2015 )

With that you send me the data you try to analyze. I would change the waveform graph to a control and don't need the source you get your data from.