[SI-LIST] Re: How they measure true RMS
- From: Harry Selfridge <harrys@xxxxxxxxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 15 Dec 2003 16:04:44 -0800
If not the heated resistor, then something along the lines described at the
links below:
http://www.analog.com/library/analogDialogue/archives/34-01/rmsarticle/
http://www.analog.com/Analog_Root/productPage/productHome/0%2C%2CAD536A%2C00.html
At 03:42 PM 12/15/03, you wrote:
>I was in Sears today and saw a very nice digital multimeter with * TRUE RMS
>* AC capability for $69.00 That got me thinking about HOW they measure
>true RMS value. In the old days they passed the waveform through a resistor
>and measured the heat. Can a $69 multimeter have enough processing power to
>be truly sampling and integrating the waveform to get the true RMS value?
>Or do they use some other technique?
>
>Just wondering if anybody knew (the salesperson in the store, of course,
>didn't even understand the question!!)
>
>Doug
snip
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