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PSD estimate using FFT - scaling and units

PSD estimate using FFT - scaling and units
  1. How do you calculate PSD from FFT?
  2. How is PSD value calculated?
  3. What are the units of PSD?
  4. How do you calculate power spectrum from FFT?

How do you calculate PSD from FFT?

A PSD is computed by multiplying each frequency bin in an FFT by its complex conjugate which results in the real only spectrum of amplitude in g2.

How is PSD value calculated?

Summary: Calculating PSD from a Time History File

Frequency-domain data are converted to power by taking the squared magnitude (power value) of each frequency point; the squared magnitudes for each frame are averaged. The average is divided by the sample rate to normalize to a single hertz (Hz).

What are the units of PSD?

PSD is typically measured in units of Vrms2 /Hz or Vrms/rt Hz , where "rt Hz" means "square root Hertz". Alternatively, PSD can be expressed in units of dBm/Hz.

How do you calculate power spectrum from FFT?

To get the PSD from your FFT values, square each FFT value and divide by 2 times the frequency spacing on your x axis.

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