how do i measure frequency?

[p0lly]

lets say theres this signal in volts. if you plot the signal it forms a sine graph. is there any way to use labview to determine the frequency of the signal? i've tried to use the "measure frequency vi" but my device is connected to a virtual channel, and i dont think that VI supports that...

[rgharrison]

Hi Polly,

There are several ways to measure frequency in LabVIEW. You can measure the frequency of a pulse train using DAQ hardware (counters). You can also just take a buffer of data and simply use LabVIEW functions to read the frequency of the buffer. An example function would be Extract Single Tone Information.vi. There are many other functions as well. Hope that helps.

Ron