**From:** Larry Miller (*ldmiller@rhapsodynetworks.com*)

**Date:** Tue May 29 2001 - 12:51:20 PDT

**Next message:**Ingraham, Andrew: "RE: [SI-LIST] : Antenna Problem on the Board"**Previous message:**Zabinski, Patrick J.: "RE: [SI-LIST] : RMS Definition, clarification"**Maybe in reply to:**Doug Brooks: "[SI-LIST] : RMS Definition"**Next in thread:**Doug McKean: "Re: [SI-LIST] : RMS Definition"**Reply:**Doug McKean: "Re: [SI-LIST] : RMS Definition"

The formal definition is an integral, f(t), etc. Sines, squares, and

triangles are just special simple cases. The "correct" way to measure it is

with a bolometer. I think that some Fluke meters work this way, and most

microwave power meters worth their salt do.

Larry Miller

-----Original Message-----

From: Neeraj Pendse [mailto:cnepsc@ptg.nsc.com]

Sent: Tuesday, May 29, 2001 12:41 PM

To: Doug Brooks

Cc: si-list@silab.eng.sun.com

Subject: Re: [SI-LIST] : RMS Definition

Hi Doug,

The definition of RMS value of ANY given periodic signal is that DC

voltage, which when applied to a conductor, will generate the same

temperature as the given periodic signal applied to the same conductor

for the same amount of time. In essence, it is the DC voltage that

will deliver the same amount of power as the given signal when both

are applied to the same load.

- Neeraj.

National Semiconductor Corporation

http://www.national.com

*>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<
*

On 5/29/01, 9:33:45 AM, Doug Brooks <doug@eskimo.com> wrote regarding

[SI-LIST] : RMS Definition:

*> Hi Gurus
*

*> I am looking for the mathematical formula for RMS voltage. I seem to
*

*> remember that it can be expressed as an integral of a squared
*

function. I

*> can almost fake it(!) but I'd like to see the real thing! I would also
*

like

*> to see a table of RMS values for different types of (non-sinusoidal)
*

*> waveforms (such as triangular, saw tooth, etc.) Can anyone point me
*

to a

*> web page where this info might exist. Or perhaps, might someone create
*

the

*> formula in an equation editor and e-mail it to me as an attachment.
*

*> Thanks for any help
*

*> Doug Brooks
*

*> ***********************************************************
*

*> Doug Brooks' book, "Electrical Engineering for the Non-Degreed
*

Engineer is

*> now in its 3rd printing. Learn about it at www.ultracad.com
*

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**Next message:**Ingraham, Andrew: "RE: [SI-LIST] : Antenna Problem on the Board"**Previous message:**Zabinski, Patrick J.: "RE: [SI-LIST] : RMS Definition, clarification"**Maybe in reply to:**Doug Brooks: "[SI-LIST] : RMS Definition"**Next in thread:**Doug McKean: "Re: [SI-LIST] : RMS Definition"**Reply:**Doug McKean: "Re: [SI-LIST] : RMS Definition"

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