[Eeglablist] re Shielding paint: unlikely to work

[Sue Pockett]

On Jan 22, 2008 4:00 AM, Fouquet N.C. <N.C.Fouquet at swansea.ac.uk> wrote:

>  In the lab where I work, it's 50 Hz (UK).
> I had contacted a collaborator who is now working in a company doing EMF
> testing, for his advice on that sort of paint shielding etc stuff for my lab
> and basically what he said was that the problem was more likely to be an
> eathing or earthing loop issue ("50 Hz noise is very often from injected
> or stray currents rather than radiated fields"). And in his opinion and
> experience, it's very hard to shield against 50 Hz fields, and metal
> wallpaper etc won't work too well.
>

I agree that sheet metal of any sort (which would include paint) doesn't
work at all against 50/60 Hz fields - but we find that aluminium mesh with
holes of the order of 0.5 cm wide works very well.  The sort of stuff you
sometimes see in screen doors.

Sue
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