Re: [TCML] Faraday Cage Safety

[Mark X2 <susax2@xxxxxxxxx>]

That's right, 2 different situations, one with a large coil and people
who'd insist on the close up experience, the other with a small coil next
to a computer.
But my question is answered with the 1/10th wavelenght thumb rule.
Thanks

Mark


2013/8/12 dave pierson <dave_p@xxxxxxxxxxx>

>
>
> > I've got some questions I was hoping you or someone else could answer
> > about Faraday cages:
> >
> > What would be a safe mesh size to catch streamers from entering the
> > cage?
>    Leaving?
>    Any reasonable _mesh_ from 1.5" 'chicken wire on down to
>    window screen.  Or an array of bars.
>
> > More important would be, what mesh size should one use to have a
> > Faraday cage that's effective to keep interference within?
>    Keeping RFI/EMI inside also depends on handling all
>    wire penetrations correctly:  filters 'in' the
>    'wall', 'bonded' to the wall.  This becomes more
>    critical in dealing with the VHF range strays, rather
>    than the 20/50/100KHz/whatever 'fundamental'.
>
>    Planning for some debug/test/rebuild time is
>    desirable..
>
> > I only presume it has got something to to with the wavelength
> > of the emitting device?
>     Yep.  The rule of thumb i was familiar with was openings
>     to be smaller than 1/10 the wavelength.  This is simple
>     at the '50 KHz end', may take some attention at the VHF
>     stray end.  A subtlety is that this measure applies to
>     the single longest dimension of an opening: picture
>     a solid copper room, with a solid copper door.  close
>     the door and its still a 6 ft opening, unless some
>     bonding/finger stock is provided.  (OK: likely
>     not relevant to most cases here.)
>
>     best
>      dwp
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