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From: Keith R. Williams
Subject: Re: phase rotation meter schematic
Date: Mon, 9 Sep 2002 21:18:17 -0400
X-Newsreader: MicroPlanet Gravity v2.60
In article ,
> I am in need of a schematic for a phase rotation meter.
I did a rather strange one 25 years ago that is frequency
insensitive and more or less voltage insensitive (it was designed
for 240/480 50/60/400hz). It was deemed reliable enough to live
in the power distribution units of megabuck mainframes for some
number of years.
Basically it uses a resistor opto-isolator/diode "Y" and schmidtt
triggers to create logic signals out of the phases. It then uses
a DFF to do the rotation discrimination.
I dug up the article from an IBM Technical Disclosure Bulitin. If
you have access to Delphion you can get it directly from there.
Search on "Pinary Power Phase Monitor" or my name. Or you can
send me an email and I'll send the PDF (limited time offer ;-). I
really don't want to re-enter the schematic here and the PDF of
the TDB article is somewhat large (150K, IIRC).
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