[Test-Equipment] rms voltmeter?

[Lloyd KK7IZ]

immi    WHAT??????????????
Thanx
Lloyd  KK7IZ
kk7iz at cox.net


----- Original Message ----- 
From: <brianclarke01 at optusnet.com.au>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Cc: <ka4inm at tampabay.rr.com>; "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Sunday, January 20, 2008 7:14 PM
Subject: Re: Re: [Test-Equipment] rms voltmeter?


Forster's information is misleading to say the least.

If you take a sinewave, divide each loop, positive and negative, into two 
halves and divide one of each of the two halves by ten, square and 
integrate, the difference from sqaring and integrating the original sinewave 
is immitesticle.

In other words, unless you need to know to the 5th electronics degree, the 
waveform matters little.

What is far more important, and is completely missing from the original 
proponent's and critic's messages, is the phase between the voltage and the 
current.

73 de Brian, VK2GCE.



> J Forster <jfor at quik.com> wrote:
>
> Only, if you KNOW the waveform is a pure sine wave or square wave, with
> an
> exception if you are using a digital scope with sampling and computation
> capabilities for doing a point by point power measurement and
> integrating it
> over a cycle.
>
> Best,
> -John
>
>
>
> Ron Youvan wrote:
>
> > [snip]
> >    Accurate power measurements can be made by putting a "T" at the
> > input of the load and viewing * the peak to peak (sine wave) voltage
> > across the load and mathematically determine the power level.
> >
> > * Using a 'scope that is flat beyond the observed frequency if
> > you have or can borrow one
>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Test-Equipment at mailman.qth.net
______________________________________________________________
Test-Equipment mailing list
Home: http://mailman.qth.net/mailman/listinfo/test-equipment
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:Test-Equipment at mailman.qth.net