Building waveform/Measuring frequency question tia sal22

[sal22]

Greetings all


I'm having some trouble measuring the frequency of an analog signal / building the waveform from an array



These are the steps I used
1) I measure the signal / voltage using Daq usb6008
2) index the channels into separate arrays
3) build a separate array of the channel I want to see the frequency of
4) output to graph.

I can build the array then build the waveform but when I look at the graphs
it's empty. Any ideas what I'm doing wrong?

tia sal22

[David_L]

Sal,

Check your Convert from Dynamic Data VI.  You are converting the data from 2 channels of dynamic data to a 1D array of scalers.  You will need to select 2D array of scalers and then you can successfully index the different channels.

Hope this helps,

[sal22]

I have selected 2D array of scalers any other ideas?

tia sal22

[Dennis_Knutson]

You did not specify what type of 2D you selected. Frankly, I don't understand all of the conversions you are doing. Why don't you simply wire the dynamic data from the DAQ Assistant to the Split Signal function and wire each signal to a Tone Measurements function. You are completely lost in the actual data analysis that you are doing now because I don't think you have a basic understanding of data types in LabVIEW. Until you do, you might want to stick to all Express VIs.

Message Edited by Dennis Knutson on 07-23-2009 08:24 AM