How to build bundle information for FFT analysis

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?
Attachments:
testing NI.vi ‏129 KB

Also have the result scaled to db. This will give you a far better overview.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

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