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IEEE 299

Recommended Practice for Measurement of Shielding Effectiveness of High-Per formance Shielding Enclosures

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Organization: IEEE
Publication Date: 1 January 1969
Status: inactive
Page Count: 17
scope:

OBJECT AND SCOPE

The object of this Recommended Practice is to provide uniform test procedures and estimation techniques to determine the relative effectiveness of room-size high performance shielding enclosures. Specifically, uniform practices are designated to determine the effectiveness of an enclosure in the usual shape of a rectangular parallelepiped with edge dimensions ranging from 1.5 to 15 meters. Test procedures are formulated to enable use of commercially available equipment for conducting tests under nonideal conditions, such as within typical facilities used to house the shielding enclosure.

A shield is defined in the IEEE Standards on Industrial Electronics as "material used to suppress the effect of an electric or magnetic field within or beyond definite regions."* A shielding enclosure is a structure composed of such a material. A high-performance shielding enclosure is generally considered to be capable of suppressing by orders of magnitude both the electric and magnetic fields. It is constructed of panels of metallic conducting sheets with provisions for continuous electric contacts between .the panels or doors. Its function may be to provide an interference-free location for the conducting of electromagnetic tests or for the operation of sensitive radio or electronic equipment where large-amplitude unwanted electromagnetic fields would otherwise be present; or it may be to confine generally high-level unwanted radiation produced by electric or electronic equipment to a limited space and thereby reduce the possibility of interference with other equipment.

Tests herein are not intended for obtaining quantitative data for the design of shielding enclosures or for evaluating the shielding effectiveness of materials, though this may be a useful by-product. This Recommended Practice does not specify construction details for shielding enclosures, nor does it suggest methods for calculating the effectiveness of such enclosures.

Uniform practices are provided to determine the effectiveness over the frequency ranges from 100 hertz to 20 megahertz, from 300 to 1000 megahertz, and from 1.7 to 12.4 gigahertz. Where it is desirable only to obtain a general estimate of the effectiveness by employing limited measurements, single-frequency tests are recommended within three standard frequency ranges: a) 14-16 kilohertz, b) 850-950 megahertz, and c) 8.5-10..5 gigahertz.

Document History

September 15, 2006
Method for Measuring the Effectiveness of Electromagnetic Shielding Enclosures
This standard provides uniform measurement procedures for determining the effectiveness of electromagnetic (EM) shielding enclosures at frequencies from 9 kHz to 18 GHz (extendable down to 50 Hz and...
September 15, 2006
Standard Method for Measuring the Effectiveness of Electromagnetic Shielding Enclosures
This standard provides uniform measurement procedures for determining the effectiveness of electromagnetic (EM) shielding enclosures at frequencies from 9 kHz to 18 GHz (extendable down to 50 Hz and...
December 9, 1997
Standard Method for Measuring the Effectiveness of Electromagnetic Shielding Enclosures
Foreword  This document provides a standard set of methods and procedures for determining the shielding effectiveness of shielding enclosures. The enclosures of concern include those used for testing...
March 11, 1991
Standard for Measuring the Effectiveness of Electromagnetic Shielding Enclosures
This standard provides uniform measurement procedures and estimation techniques for determining the effectiveness of room-size, high-performance electromagnetic (EM) shielding enclosures at...
IEEE 299
January 1, 1969
Recommended Practice for Measurement of Shielding Effectiveness of High-Per formance Shielding Enclosures
OBJECT AND SCOPE The object of this Recommended Practice is to provide uniform test procedures and estimation techniques to determine the relative effectiveness of room-size high performance...
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