"I'm just getting familiar with LabView. And I'm working on a program that uses a DAQ to read in a signal. I need to measure the frequency of these pulses coming in. Basically the signal I got, has a noise value between 0-0.5 V and peak values up to 5 V! So I think threshold peak detector is the best way to determine the frequency of these pulses. But I couldn't find it in my LabVIEW 6i software. Where is that located under the program? Is there any way to get that "threshold peak detector.vi" somewhere else? Or can you give me any better idea than using peak detector?