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From: jcallen@Encore.COM (Jerry Callen)
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: Powerline voltage too high, power co working on it
Summary: If RMS is no good, what is?
Keywords: 128V!
Message-ID: <13434@encore.Encore.COM>
Date: 5 Dec 90 20:44:40 GMT
References: <114172@philabs.Philips.Com> <9780@fy.sei.cmu.edu>
Reply-To: jcallen@encore.Com (Jerry Callen)
Followup-To: rec.ham-radio
Organization: Encore Computer Corp, Marlboro, MA
Lines: 18

In article <9780@fy.sei.cmu.edu> rsd@sei.cmu.edu (Richard S D'Ippolito) writes:
>The typical electric utility tariff (what the utility must provide under its
>contract with your state government) calls for 120v +/- 5% at your meter, or
>114-126 volts.  You can't really complain about 126 volts.  Also, a 'good'
>digital (or analog) meter will not necessarily give an accurate reading, as
>most of them are average-responding, rms-reading, because if there are a lot
>of solid-state power controls on your feeder, the AC waveform can get fairly
>chopped up.

Then what IS the basis for the 120V +/- 5% if not rms? Seems like the only
fairly repeatable reading would be peak to peak...

BTW, there is all sorts of interesting hash riding on the 60Hz sine wave.
Solid state power controls may be the least of the problem; inductive
loads can put a lot of crap on the waveform, too.

-- Jerry Callen
   jcallen@encore.com


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