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The correct FFT result to be taken

Hi all,

i am trying to measure pressure readings at different points in a tube using labview.

Meanwhile, i would also like to convert my pressure readings to complex form using FFT funciton in labview.
I am collecting the pressure at :


N (total of samples taken) = 50 k

Fs (sampling rate) = 10k
n (no. of FFT operation) = 8192

Before converting to complex form, I took the maximum pressure reading as my pressure magnitude at every single points.
However, i am not sure which results to be taken as my final complex results after i converted my pressure readings into complex form using FFT function.
Attached shows my labview code and the results i getting.

Thanks in advance for answering my questions.

 

Many thanks,

Dave

 

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can you please update your VI here?

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