Mike, KB3EIA wrote:
"Are there any good references to the effects of shielding effectiveness
as related to shield coverage?"

Yes. As Richard Clark noted, it is related to penetration depth of the
materials and that is related to "skin effect".

The best exposition of skin effect in my opinion is given in
"Radio-Electronic Transmission Fundamentals", a text by B. Whitfield
Griffith,Jr.

Originally published in 1962, it`s return is a reprint by Noble
Publishing Corp., 630 Pinnacle Court, Norcross, GA 30071; tel
770-449-6774; fax 770-448-2839; orders@ noblepub.com; www.noblepub.com.

Original publisher was McGraw-Hill.

The new Second Edition is a 648-page hardcover book which was reviewed
in the "New Products" section of the Jan. 2001 QST on page 48.

Griffith graduated from MIT, was a licensed radio amateur, senior member
of the IRE, Texas Society of Professional Engineers, National Society of
Professional Engineers, and ARRL.

In the original edition, "Skin Effect" begins on page 232. "Radiation
and its Control" begins on page 243. You don`t need calculus to
understand Griffith, but calculus never hurt anybody.

The reprint is well worth the $75 asked in 2001. In fact, it would be
worth searching elsewhere if the 2nd edition is now out of print. This
book is outstanding! ISBN 1-884932-13-4: order number NP-34. You won`t
find clearer or more concise.

Best regards, Richard Harrison, KB5WZI

Richard Harrison wrote:
Mike, KB3EIA wrote:
"Are there any good references to the effects of shielding effectiveness
as related to shield coverage?"

Yes. As Richard Clark noted, it is related to penetration depth of the
materials and that is related to "skin effect".

The best exposition of skin effect in my opinion is given in
"Radio-Electronic Transmission Fundamentals", a text by B. Whitfield
Griffith,Jr.

Originally published in 1962, it`s return is a reprint by Noble
Publishing Corp., 630 Pinnacle Court, Norcross, GA 30071; tel
770-449-6774; fax 770-448-2839; orders@ noblepub.com; www.noblepub.com.

Original publisher was McGraw-Hill.

The new Second Edition is a 648-page hardcover book which was reviewed
in the "New Products" section of the Jan. 2001 QST on page 48.

Griffith graduated from MIT, was a licensed radio amateur, senior member
of the IRE, Texas Society of Professional Engineers, National Society of
Professional Engineers, and ARRL.

In the original edition, "Skin Effect" begins on page 232. "Radiation
and its Control" begins on page 243. You don`t need calculus to
understand Griffith, but calculus never hurt anybody.

The reprint is well worth the $75 asked in 2001. In fact, it would be
worth searching elsewhere if the 2nd edition is now out of print. This
book is outstanding! ISBN 1-884932-13-4: order number NP-34. You won`t
find clearer or more concise.

Best regards, Richard Harrison, KB5WZI

Thanks very much, Richard and Ed, I'm doing a search at our University
Lib right now.

- Mike KB3EIA -

On Fri, 13 Feb 2004 13:38:42 -0500, Mike Coslo wrote:

Thanks very much, Richard and Ed, I'm doing a search at our University
Lib right now.

- Mike KB3EIA -

Hi Mike,

Add:
"Grounding And Shielding Techniques in Instrumentation,"
Ralph Morrison

"Noise Reduction Techniques in Electronic Systems,"
Henry W. Ott

Two slim volumes with more practical information than a thousand EE
books.

73's
Richard Clark, KB7QHC

Hi Mike:

I have those books if you can't find them. Many shield rooms also have a
shield of soft iron as well as the copper. The soft iron shields against
magnetic fields.


--
John Passaneau W3JXP
State College Pa

This mail is a natural product. The slight variations in spelling and
grammar enhance its individual character and beauty and in no way are to
be considered flaws or defects.



"Richard Clark" wrote in message
...
On Fri, 13 Feb 2004 13:38:42 -0500, Mike Coslo wrote:

Thanks very much, Richard and Ed, I'm doing a search at our University
Lib right now.

- Mike KB3EIA -

Hi Mike,

Add:
"Grounding And Shielding Techniques in Instrumentation,"
Ralph Morrison

"Noise Reduction Techniques in Electronic Systems,"
Henry W. Ott

Two slim volumes with more practical information than a thousand EE
books.

73's
Richard Clark, KB7QHC

"John Passaneau" wrote in message
...
Hi Mike:

I have those books if you can't find them. Many shield rooms also have a
shield of soft iron as well as the copper. The soft iron shields against
magnetic fields.


The traditional modular shielded enclosure has become standardized to a
design of 4' x 8' x 3/4" panels, held with a "hat & flat" clamping rail
system. Each panel is a sandwich of a sheet of galvanized steel, plywood and
another layer of galvanized steel. The steel is often about 24 gauge. This
is a trade-off between weight, manufacturing ease, and durability. The
galvanizing ensures good conductivity at the joints. The steel does give you
a bit of LF H-field SE, but the real reason for the steel is that it's just
a whole lot cheaper that copper screen, and lasts better, since the SE
doesn't degrade and it isn't nearly so vulnerable to puncture.

If you want serious H-field shielding, you need to go to thick steel
(welded) chambers, or employ exotic alloys (expensive, and physically &
magnetically vulnerable).


Ed
wb6wsn

On Fri, 13 Feb 2004 13:38:42 -0500, Mike Coslo wrote:


Look here too:

http://www.ce-mag.com/99ARG/Bjorklof137.html