All:
Per ASTM's Standard's site
http://www.astm.org/cgi-bin/SoftCart.ex
/DATABASE.CART/WITHDRAWN/D4935.htm?L+mystore+ekqo2138
Document Summary
Copyright 2006 ASTM International. All rights reserved.
WITHDRAWN STANDARD: D4935-99 Standard Test Method for Measuring the
Electromagnetic Shielding Effectiveness of Planar Materials (Withdrawn 2005)
<javascript:onClick=OpenLicense('LICENSE_ASTM.htm');> WITHDRAWN, NO
REPLACEMENT
Developed by Subcommittee: <http://www
astm.org/cgi-bin/SoftCart.exe/COMMIT/SU
COMMIT/D0912.htm?L+mystore+ekqo2138+1146267845> D09.12
Withdrawn Rationale:
This test method covers a procedure for measuring the electromagnetic (EM)
shielding effectiveness (SE) of a planar material due to a plane-wave,
far-field EM wave. From the measured data, near-field SE values may be
calculated for magnetic (H) sources for electrically thin specimens. Electric
(E) field SE values may also be calculated from this same far-field data, but
their validity and applicability have not been established.
Formerly under the jurisdiction of Committee D09 on Electrical and Electronic
Insulating Materials, this test method was withdrawn in September 2005. This
test method was withdrawn without replacement since Committee D09 cannot
maintain a standard for which the expertise may not lie within the current
committee membership, or for which the utilization of the standard is
questionable.
1. Scope
1.1 This test method provides a procedure for measuring the electromagnetic
(EM) shielding effectiveness (SE) of a planar material due to a plane-wave,
far-field EM wave. From the measured data, near-field SE values may be
calculated for magnetic (H) sources for electrically thin specimens. Electric
(E) field SE values may also be calculated from this same far-field data, but
their validity and applicability have not been established.
1.2 The measurement method is valid over a frequency range of 30 MHz to 1.5
GHz. These limits are not exact, but are based on decreasing displacement
current due to decreased capacitive coupling at lower frequencies and on
overmoding (excitation of modes other than the transverse electromagnetic mode
(TEM)) at higher frequencies for the size of specimen holder described in this
test method. Any number of discrete frequencies may be selected within this
range. For electrically thin, isotropic materials with frequency-independent
electrical properties of conductivity, permittivity and permeability,
measurements may be needed at only a few frequencies as the far-field SE
values will be independent of frequency. If the material is not electrically
thin or if any of the parameters vary with frequency, measurements should be
made at many frequencies within the band of interest.
1.3 This test method is not applicable to cables or connectors.
1.4 This standard may involve hazardous materials, operations, and equipment.
This standard does not purport to address all of the safety problems
associated with its use. It is the responsibility of the user of this standard
to establish appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.
_____
William T. Sykes
Lucent Technologies EH&S
Product Safety/Conformance Manager
Room 7B-516A
600-700 Mountain Avenue
Murray Hill, NJ 07974-0636
(908)582-6937
From: [email protected] [mailto:[email protected]]On Behalf Of Grasso, Charles
Sent: Friday, April 28, 2006 3:54 PM
To: John Kretsch; [email protected]
Subject: RE: Conductive Paint Provide Decent Shielding Effectiveness?
Buyer beware – at least of the test method. I am not familiar with
the ASTM standard quoted but I would look there first and of course
ask about the frequency range.
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: [email protected]
Email: [email protected];
Email Alternate: [email protected]
_____
From: [email protected] [mailto:[email protected]] On Behalf Of John Kretsch
Sent: Thursday, April 27, 2006 9:03 PM
To: [email protected]
Subject: Conductive Paint Provide Decent Shielding Effectiveness?
This topic has come up regarding painting the inside of a plastic housing with
something like Electrodag550
http://www.achesonindustries.com/doc/pds/Electrodag550.pdf
It claims 60 dB (frequency range is not specified) with a 0.002 minimum
application thickness.
Does anyone have any experience with this? Any long term durability issues?
Regards,
John R. Kretsch, P.E., NCE
Principal
Interpro Consulting Engineering, LLC
(860) 919-2980
http://www.ip-ce.com
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Instructions: http://listserv.ieee.org/request/user-guide.html
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