Howtosignalprocessing
Output Units for FFT-Based VIs
| VI | Non-DC Unit (k>0) | DC Unit (k=0) |
|---|---|---|
| FFT Power Spectrum and PSD (power spectrum measurement) | Vrms2 | V2 |
| FFT Power Spectrum and PSD (power spectral density measurement) | Vrms2/Hz | V2/Hz |
| FFT Spectrum (Mag-Phase) | Vrms | V |
| FFT Spectrum (Real-Imag) | Vrms | V |
What are the units of an FFT?
The FFT calculates sum of its input sampled at discrete time points multiplied by dimensionless values; the units of the result of the FFT are those of its input; there is no scaling by time or frequency in the process.
How do you calculate FFT frequency?
To find the frequency, you just take f=1/T.
What are the units of a DFT?
For an array of inputs fn≡f(xn) of length N the discrete Fourier transform (DFT) is normally defined as fk=N−1∑n=0fnexp(−2πikn/N). This means that fk has the same units as f: [fk]=[f].
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