detect piece of signal

[mysimba]

Hello everybody,

I have a little problem to build a Vi, I have a signal from an electronic and I want to detec only a region of this signal to work with it but I don't have an idea how o do it .

In attachement I send a bild, and the signal I have to detect. It is between the signal proceed the realeasing (I know how to detect), and the pic after 2.5 (I don't know how to do).

Please help me and thank a lot. 

[Markus Heigl]

Hello,

you want to select the area between the beginning of signal falling to the peak which is shown in your filtered signal.
How do you select your start point?

[mysimba]

I made a Vi wich when 10 successive points are less then 90% from the max of the voltage it begin to measure.

And for the peak I don't know how to do it.

[Markus Heigl]

You can of course stopp your measurement if the value passed for examble 2,2 V but this won't be an very exact stop point.
If I watch the waveform graph, i think that the values will decrease always after the peak, is that correct?
Then you can stopp your signal, if there are a greater number of values in a row, which fall. That would be more exactly.

But to detect exactly a peak in an unfiltered signal which has such big fluctuations is nearly unpossible i think.