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What are the Output Units of FFT-based VIs?

Primary Software: LabVIEW Development Systems>>Professional Development System
Primary Software Version: 8.2
Primary Software Fixed Version: N/A
Secondary Software: LabVIEW Development Systems, LabWindows/CVI Development Systems

Problem: I am using one of the FFT VIs in LabVIEW or FFT functions in CVI and I want to know what the output units are.

Solution:

The following table displays the output units and scale factors that the LabVIEW FFT-based VIs use.

VI	Non-DC Unit (k>0)	DC Unit (k=0)	Sided	Non-DC Scale Factor	DC Scale Factor	Phase Unit
FFT	V	V	Double	N/2	N	radians
Power Spectrum	Vrms2	V2	Double	1/2	1	—
Auto Power Spectrum	Vrms2	V2	Single	1	1	—
Amplitude and Phase Spectrum	Vrms	V	Single	1	1	radians
FFT Power Spectrum	Vrms2	V2	Single	1	1	—
FFT Power Spectral Density	Vrms2/Hz	V2/Hz	Single	1	1	—
FFT Spectrum (Mag-Phase)	Vrms	V	Single	1	1	radians/degrees
FFT Spectrum (Real-Imag)	Vrms	V	Single	1	1	radians/degrees

Related Links: LabVIEW 8.2 Help: Output Units for FFT-Based VIs


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Report Date: 06/22/2006
Last Updated: 10/20/2006
Document ID: 3YLGIEW1

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