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 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu