Hi John:
> He sees the video distorted and was wondering
> about any health risks.
The first thing you should do is ascertain that the
distortion is caused by an external source or an
internal (to the monitor) source. It is possible
that the degauss circuit has failed, in which case
you will get a distortion that remains constant with
position of the monitor.
The cause of the distortion is likely to be the
magnetic interference from the transformer. You can
test for this by rotating the monitor (in which case
the shape and color should change), and by moving
the monitor further away from the transformer (in
which case the shape and color should change and
diminish).
Note that a permanent magnet near the screen has a
similar effect, but over a limited area.
A good web site that cites magnetic exposure
standards is:
http://www.lessemf.com/standard.html
60-Hertz magnetic exposure limits range from 2.5
mG to 10 G, depending on the standard. There is
little agreement as to both the effect on the body
and the exposure limit.
If you go to the home page, you will find some more
(highly pessimistic) info and some good (not
necessarily pessimistic) links. There is some data
describing possible health risks, but remember that
there is little substantial research in the effects
of magnetic fields upon the body.
Best regards,
Rich
-------------------------------------------------------------
Richard Nute Product Safety Engineer
Hewlett-Packard Company Product Regulations Group
AiO Division Tel : +1 619 655 3329
Effective 6/12/99: +1 858 655 3329
16399 West Bernardo Drive FAX : +1 619 655 4979
Effective 6/12/99: +1 858 655 4979
San Diego, California 92127 e-mail: [email protected]
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