topic Re: Basic Level trigger not working as expected in LabVIEW

Basic Level trigger not working as expected

FJ_Sanchez+ — Thu, 29 Oct 2015 11:53:13 GMT

Hello,

I am trying a very simple example using "Basic Level Trigger Detection.vi" and it is not working as expected.

I want to get the first 3 rising edges (even without hysteresis) but I always get the first one. The help says that this VI internally stores the status (I have also check that in the code) but I see when debugging that it always returns 0 in the terminal where the history should be stored.

I can workaround with my own VI or using subsets of the input signal, but is it a bug?

Thank you.

Re: Basic Level trigger not working as expected

Bob_Schor — Thu, 29 Oct 2015 14:48:15 GMT

I've not used this function before, but it does clearly state that it looks for the first level crossing of the input signal. You are asking it, three times, to find the same thing, and what-do-you-know, it finds the same thing!

I'm puzzled by what "Reset" is supposed to do. It sounds like it might "remember" it's last value, and take off from there, but I'm not certain that is correct.

Bob Schor

Re: Basic Level trigger not working as expected

FJ_Sanchez+ — Thu, 29 Oct 2015 16:47:08 GMT

Thank you Bob,

certainly I think I have misunderstood what this function does... I have already implemented a solution to this using subsets of the input waveform.

Thank you.