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Unit for Power Spectrum: Vrms or Vrms2 - which one is true?

Question asked by onemilimeter on Aug 26, 2009
Latest reply on May 19, 2010 by mukta2008
A signal is attached to Channel-1 of an Agilent 35670A Dynamic Signal Analyzer. The unit of the signal measured by the analyzer is as follows:

Time Capture (time domain): Volt (V)
Linear Spectrum (frequency domain): Volt-RMS (Vrms)
Power Spectrum (frequency domain): Volt-RMS (Vrms)

However, some online articles, for example the following:
http://zone.ni.com/reference/en-XX/help ... _spectrum/
http://www.onosokki.co.jp/English/hp_e/ ... _term5.htm
... show that for a voltage signal, the unit of the power spectrum of the signal is Volt-RMS squared (Vrms^2).

Which one is correct?

Thanks.  

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