Aug 26, 2009 #1 P powersys Advanced Member level 1 Joined Nov 29, 2005 Messages 439 Helped 3 Reputation 6 Reaction score 2 Trophy points 1,298 Activity points 4,981 power spectrum unit 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/371361D-01/lvanls/power_spectrum/ http://www.onosokki.co.jp/English/hp_e/c_support/tech_term/tech_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.
power spectrum unit 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/371361D-01/lvanls/power_spectrum/ http://www.onosokki.co.jp/English/hp_e/c_support/tech_term/tech_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.
Aug 27, 2009 #2 snafflekid Full Member level 4 Joined May 9, 2007 Messages 211 Helped 31 Reputation 62 Reaction score 8 Trophy points 1,298 Location USA Activity points 2,644 unité vrms I would expect Vrms^2.
Aug 27, 2009 #3 A ark5230 Advanced Member level 3 Joined Jun 29, 2009 Messages 862 Helped 163 Reputation 324 Reaction score 140 Trophy points 1,323 Location India Activity points 6,187 vrms unit power = V^2/R, therefore as suggested by snafflekid power is proportional to Vrms^2. Thus for power spectrum this is what is to be used. Raoof
vrms unit power = V^2/R, therefore as suggested by snafflekid power is proportional to Vrms^2. Thus for power spectrum this is what is to be used. Raoof