Need help to Plot FFT for a pulse wave (Voltage Vs Time)

[Kumar54]

Hi all - I have an .csv file carrying the two columns with one for Time & another for Voltage(pulse wave form). I am looking for a help on plotting FFT for those in the Labview using the Block diagram concept.

I wonder ,if anyone have answer for this.

Thanks

Kumar

[Tanya_V]

Hi Kumar,

To read a .csv file into LabVIEW you can use the Read from Spreadsheet File.vi. This can be found on the Functions palette under Programming»File I/O. The following community example shows how to read from a .csv file:

http://decibel.ni.com/content/docs/DOC-11074

As for the FFT, we have a lot of examples included with LabVIEW that use the FFT. If you go to Help»Find Examples... you will open the Example Finder. In here you can browse through the folders for Analyzing and Processing Signals»FFT and Frequency Analysis. These examples will help you get started with FFTs in LabVIEW.

Also, we have some good tutorials to get you started with general LabVIEW programming.

http://www.ni.com/academic/lv_training/how_learn_lv.htm

I hope this helps!

Tanya