Fake FFT?

Hello

I built a vi that performs the FFT of a signal (~ 200,000 admissions in a 1 d table), during its operation, I'm not sure it will output the correct answer (or at least it is not sensible for me).

I'm trying to find the frequency of distribution. The signal was acquired to ~ 200 Hz. A screenshot of the output and the vi are attached.

Any thoughts? I really need help with that.

Thank you

simply_me wrote:

Rest only one problem - the two scales of the horizontal and vertical axes (horizontal must be frequency), no idea on how to change it?

The link does not show how to handle this issue (of index instead of the time domain).

You must set the increment of the x axis to reflect the appropriate units.

For the chart of field time, 1/200 and for the field of frequency to the derived value as described above.

You can set the increment of axis in many ways:

  • Manually via the properties of the chart (-right click...) Properties)

  • Via a property of the graph node (X - scale.multiplier)

  • By grouping as illustrated in the city figure 25.

Tags: NI Software

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