IEEE 299 1991

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IEEE Standard for Measuring the Effectiveness of Electromagnetic Shielding Enclosures

Published By	Publication Date	Number of Pages
IEEE	1991	32

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Description

Revision Standard – Inactive – Superseded. Uniform measurement procedures and techniques are provided for determining the effectiveness of electromagnetic shielding enclosures at frequencies from 9 kHz to 18 GHz (extendable to 50 Hz and 100 GHz, respectively) for enclosures having no dimension less than 2.0 m. The types of enclosures covered include, but are not limited to, single-shield or double-shield structures of various construction, such as bolted demountable, welded, or integral with a building; and made of materials such as steel plate, copper or aluminum sheet, screening, hardware cloth, metal foil, or shielding fabrics.

PDF Catalog

PDF Pages	PDF Title
7	1 General 1.1 Scope 1.2 Application 1.3 Objectives 2 References 3 Definitions
8	4 General Procedures 4.1 Background 4.2 Preliminary Procedures Basic Measurement Procedure
9	Detailed Procedures 5.1 Standard Measurement Frequencies 5.2 Extended-Range Measurement Frequencies 5.3 Shielding Relationships Small-Loop Test Setup
10	Standardized Positions for Small-Loop Test
11	Low-Range (14 kHz to 20 MHz) Loop Measurements Frequency Range and Band Equipment and Setup 5.4.2.1 Source of Magnetic Field 5.4.2.2 Detector 5.4.3 Preliminary Procedure 5.4.3.1 Shielding Defects 5.4.4 Free-Field Calibration 5.4.5 Measurement Procedure Standard Measurement Frequencies Extended-Range Measurement Frequencies
12	Shielding Relationships
13	Determination of Low-Range Shielding Effectiveness GHz) Dipole Measurements Frequency Range and Band Standard Locations for Loops Along Entrance Wall With n Panels
14	Test Equipment and Setup 5.5.2.1 Source of Midrange Electromagnetic Field Lowest Natural Resonant Frequency Chart
15	5.5.2.2 Detector Midrange Measurement Setup
16	Setup for Simulating Free Field
17	5.5.3 Preliminary Procedure 5.5.4 Free-Field Calibration 5.5.5 Measurement Procedure
18	Determination of Midrange Shielding Effectiveness High-Range 1.7 to 18 GHz) Horn Measurements Frequency Range and Band 5.6.2 Test Equipment and Setup Source of High-Range Electromagnetic Fields 5.6.2.2 Detector 5.6.3 Preliminary Procedure Dimensions and Frequency Ranges for Open-Waveguide Source Antennas
19	High-Range Measurement Setup
20	5.6.4 Free-Field Calibration Basic High-Range Measurement Procedure for All Shield Configurations Procedure for Single-Shield Enclosures Dimensions and Frequency Ranges for Horn Antenna of Detector
21	Procedure for Rigid Double-Shield (Isolated or Cell-Type) Enclosures Procedure for Nonrigid Double-Shield (Isolated or Cell-Type) Enclosures Determination of Shielding Effectiveness 5.7 Substitution Technique 6 Quality Assurance Technical Report Background Measurement Procedure
22	Measurement Instrumentation Results Standard Measurements of Shielding Performance
23	Standard Data Format
25	Appendix A Rationale A1 Basis Considerations Pertinent to Objective A2.1 Standard Measurements A2.2 Preliminaries A2.3 Nonlinearity Extended Frequency Range
26	A3 Additional Considerations A3.1 Cavity Resonances A3.2 Working Space A3.3 Measurement Locations A3.4 Measurement Equipment
27	Appendix B Mathematical Expressions Specific Mathematical Formulations 20 MHz) Shielding Effectiveness Midrange (300 MHz to 1 GHz) Shielding Effectiveness B4 High-Range 1.7 to 18 GHz) Shielding Effectiveness
28	Averages of Multiple Measurements
29	Appendix C Miscellaneous Considerations Coplanar vs Coaxial Loops Nonlinearity of High-Permeability Ferromagnetic Enclosures C3 Selecting Measurement Frequencies C3.1 Regulatory Note C3.2 Selecting Frequencies
30	Suggested Measurement Frequencies Typical Shielding Performance Table C1 ISM and FDS Frequencies
31	Table C2 Suggested Test Frequencies for the 10 kHz to 18 GHz Range
32	Table C3 Typical Shielding Performance

Additional information

Standard Title	IEEE Standard for Measuring the Effectiveness of Electromagnetic Shielding Enclosures
Published Code	IEEE
Publication Date	1991
Pages Count	32

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