how to build bundle information for FFT analysis

[jtteo]

Hi guys

I'm trying to read information from NI DAQ one data at a time with an interval of 20ms, which is 50Hz.

I tried to bundle up the information using "bundle" function with the t0 and dt(0.02)

however, FFT keep showing only one peak at 0Hz

am I doing this correct?

[JK1]

That is because the 1 second of data you are feeding doesnt have any frequency components or just a DC.  I tried the same setup as you have and it works fine for sine input.

Post back for queries.

[Coq_Rouge]

Also have the result scaled to db. This will give you a far better overview.