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How to conver FFT values?

When I use FFT as a result I get V^2 rms values of harmonics of my signal. Is there any possibility to convert V^2 rms values of my harmonics back to V value? I need to know amplitude (in V) and frequencies of them. This operation does “Extract Single Tone Information.vi” (if I understand correctly how does it work.) but it works only for one harmonic but I need to do it for some of them and simultaneously.
Share with your ideas.
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Have you tried to use the Harmonic Distortion Analyzer.vi (next to the Extract Single Tone Information.vi)? This VI computes the total harmonic distortion of your signal but also returns an array with the amplitude of each detected harmonic component.

Alain
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