Kral
Joined: 28 Mar 2005
Posts: 1020
Helped: 166
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 09 Aug 2008 19:42 Re: Basic question |
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-jps-
Your question is not entirely clear. If you are measuring DC, then the average and RMS vlaues are identical. If you're measuring AC, then the reading, whether analog or the result of A/D conversion depends on the signal conditioning circuit. In general, if you want to measure true RMS, special analog circuitry or software is required to measure true RMS. Many systems respond to either the average or the peak value, and scale the output to indicate RMS. However, systems of this type indicate true RMS for a sine wave only. For example, if you have a system that senses the average value, and indicates RMS (as many meters do), the system would simply multiply the average voltage by approx 1.11 to indicate RMS, but this would be accurate for sine waves only. If this system measured a square wave, the system would indicate a value equal to 1.11 times the average magnitude, but the true RMS value would be equal to the average magnitude.
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This reasoning aplies to all measurements, not just full scale.
Regards,
Kral
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