how to extract/detect which data set to display

[Quan]

Hello,
I need a bit of help trying to figure out how to detect which channel of data has the data I want to display. There are four data channels, and only one has a sine wave in it. The others are all some sort of noise. Is there a quick labview routine that will allow me to perform this task easily?

thanx in advance,
-Quan

[chutla]

Greetings, Quan:

The "Extract Single Tone" vi should do the trick. If there is a sine wave to extract, it will show up...if not, it won't! You can then use a comparator function set to some predetermined level to set a trigger on whichever channel the sine wave appears.

Eric

[Quan]

Hi Eric,
Thanx for the tip. I tried the Extract Single Tone Information vi and it seems to do something. It is not doing exactly what i had hoped for but with a little bit more tweaking it might be even better than i had hoped for.

thanx again,
-Quan