>From vague memory...
there was some work done by Don White (?) that shows tables
of this type of improvement. Full of practical data and
information.
- Robert -
On Mon, 17 Nov 2003 15:21:54 -0000
"Jeff Chambers" <j.chamb...@ndirect.co.uk> wrote:
>
> I have been asked to comment on what improvement might
> be expected in
> changing the design of an equipment lid from:
>
> A flat lid sat on the edges of the box, where the gaps
> between fasteners can
> be modelled as a simple aperture, where the attenuation
> decreases linearly
> with log(f) to zero at a half wavelength.
>
> To:
> A stepped lid, with the lid sat on the edges, and with
> the projection
> extending below the inner edge of the box.This removes
> the 'line of sight'
> gap into the enclosure. Does this improve the
> attenuation? Intuitively it
> should, but if the leakage occurs because of the
> interruption in shielding
> conductivity and hence current flow at the seam, it
> won't.
>
> Does anybody have any references to analyses of the
> above, or comments,
> please?
>
> (No emi gaskets are used btw).
>
> Thanks, Jeff Chambers
>
>
> Dr Jeff Chambers
> Westbay Technology Ltd
> Main St
> Baycliff
> Ulverston
> Cumbria LA12 9RN
> England
> Tel: 01229 869 108
> Fax: 01229 869 108
> http://www.westbay.ndirect.co.uk
>
>
>
> -------------------------------------------
> This message is from the IEEE EMC Society Product Safety
> Technical Committee emc-pstc discussion list.
>
> Visit our web site at:
> http://www.ewh.ieee.org/soc/emcs/pstc/
>
> To cancel your subscription, send mail to:
> majord...@ieee.org
> with the single line:
> unsubscribe emc-pstc
>
> For help, send mail to the list administrators:
> Ron Pickard: emc-p...@hypercom.com
> Dave Heald: emc_p...@symbol.com
>
> For policy questions, send mail to:
> Richard Nute: ri...@ieee.org
> Jim Bacher: j.bac...@ieee.org
>
> Archive is being moved, we will announce when it is back
> on-line.
> All emc-pstc postings are archived and searchable on the
> web at:
> http://www.ieeecommunities.org/emc-pstc
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your subscription, send mail to:
majord...@ieee.org
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Ron Pickard: emc-p...@hypercom.com
Dave Heald: emc_p...@symbol.com
For policy questions, send mail to:
Richard Nute: ri...@ieee.org
Jim Bacher: j.bac...@ieee.org
Archive is being moved, we will announce when it is back on-line.
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
