Can I get an FFT from this?

I am doing DAQ uaing AI S-scan.vi and wanted to know if I can take the output from it and make a power specturm. I know I can do it using AI Continuous input.vi, but the input from that is buffered so it comes out in chunks and so S-scan is preferable if it works. Any help would be much appreciated. Thanks.
Intern NSWCCD Carderock.
Attachments:
Untitled.vi ‏31 KB

How many channels of data are you expecting? What are you expecting to happen with a one dimension array passed through the reshape? The data coming out of a single scan is a 1 X # channels array, so what you are plotting now appears to be a graph of all the channels or if you have only one channel then it is building a graph, using the graph's history feature, of your signal. If you build a LV2 style global (see other threads) and pass the data from each acquisition into it, you can build up an array and you can monitor it in another loop with your FFT math. When the LV2 array reaches the appropriate size (a power of 2 in the #of samples dimension) you can have it signal the FFT math loop to do its thing. This could be just a data size value fed into the LV2 global, and a boolean that shows true when the correct size array is created. You can then "flush" the LV2's data (read it all out) and the DAQ loop will start building it again. You will have the time domain displaying continuously, the FFT each time it gets enough data.
Attached is a really quick, and dirty, example. If haven't tested it with DAQ hdw, the LV2 global should work though.
It is in LabVIEW 7.1
P.M.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion
Attachments:
DAQ w-FFT.llb ‏73 KB

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