Why Express PSD gives a different result of amplitude as FFT PSD?

Hello

When I use the express VI of spectral measures to trace the power spectral density, I get a different result than when using the FFT PSD VI. The data are the same but the amplitudes are different in the PSD plot. Everyone comes through this?

Thank you

Donners,

The PSD2 and graphic PSD2 are different because you are breastfeeding two extra points in the tables (t0, df). When graphic entry of data in the tables, they interpret not automatically information of t0 and df.  Actually they do not yet receive this information.  You must program the scales with nodes of property.  If you simply draw the order of magnitude, the spectra are very similar.

^ ^ ^ This confuses only the chart!

The spectral forms differ slightly as the power spectrum of FFT and PSD.vi uses a default Hanning window.

Lynn

Tags: NI Hardware

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