IEEE 1302:2019 pdf download.IEEE Guide for the Electromagnetic Characterization of Conductive Gaskets in the Frequency Range of DC to 40 GHz.
The scope of this guide is to provide manufacturers of gaskets and designers of electronic systems appropriate methods for the characterization of gaskets. This document guides the user in the selection of the appropriate test method in order to determine the level of electromagnetic shielding provided in the intended application.
1.2 Purpose
The purpose of this guide is to provide guidance on the strengths and weaknesses of each of the recommended methods, and provide in-depth documentation for each method. Therefore, it identifies limitations and sources of errors of the commonly accepted techniques for measuring gaskets, and provides a basis for comparing the various accepted techniques. It encompasses measurements of the as-installed behavior of gaskets as well as manufacturing-related quality control measurements.
Special attention is also given to test methods for small samples of gaskets (also above 1 GHz), correlation between different methods, and identification of possible measuring methods for near-field characterization of gaskets [as used on printed circuit board (PCB) board applicationsj.
1.3 Word usage
The word s/ia/I indicates mandatomy requirements strictly to be followed in order to conform to the standard and from which no deviation is permitted (shall equals is required to).’
The word should indicates that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required (should equals is recommended that).
The word may is used to indicate a course of action permissible within the limits of the standard (may equals is permitted to).
The word can is used for statements of possibility and capability, whether material, physical, or causal (can equals is able to).
1.4 Background
The ideal electromagnetic shield is an infinitely conductive enclosure with no apertures or penetrations of any kind. Functional requirements and practicalities of design and construction prevent this ideal from being realized. Penetrations for power, signals, and ventilation as well as access apertures for calibrations, controls, and adjustments could be incorporated into an enclosure preventing it from being an ideal enclosure. An enclosure should include all of the intended design features when evaluating it for its shielding effectiveness.
Electromagnetic energy exits or enters the shield at apertures, along conductive penetrations, and through imperfect seams. To restrict this coupling of energy to levels sufficiently low to comply with regulations and to permit interference-free operation, these unwanted coupling paths shall be closed. Filters are used on the penetrations; screens and covers may be used over apertures. Seams and joints require special attention, however. For shielding, metal flow processes such as welding, brazing, and soldering are the preferred methods for making joints and seams. Many situations arise, however, where these techniques cannot be used and direct metal-to-metal contact does not provide an adequate electromagnetic seal. In these cases, an electromagnetic interference (EM 1) gasket should be installed in the joint.IEEE 1302 pdf download.