Subject:  Re EMF-L Measurement Protocols
Date:     Thu, 24 Jul 1997 084133 -0500 (CDT)
From:     kriley3@ix.netcom.com
To:       Multiple recipients of list <emf-l@mail.llion.org>
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Andrea: You will find power frequency measurement protocols in my
book, Tracing EMFs in Building Wiring and Grounding, the contents of
which I faxed to you last night. But protocols vary depending on what
the purpose of the study is. Epidemiologists have at times taken only
one measurement per house. I take measurements throughout the building
in a grid of about every six feet, with a three-axis gaussmeter. But
my purpose is to locate sources for mitigation. I switch to single
axis for locating sources and also to tell if the field from a power
line is balanced or if there is net current on the line.
The Dr. Gauss meter, which measures up to 10 mG, is probably the best
of the cheapies, but it has a linear response to frequency, which
means it does not read harmonic frequencies correctly. It will read a
4 mG field produced by the third harmonic as 12 mG. Best to use a
meter with a flat frequency response over the frequency band of
interest. Karl Riley


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Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html