How does aging affect the shielding effectiveness of a gasket? Brian W. Callen, Ph.D. and Claudia E. Johnston Sulzer Metco (Canada) Inc., Fort Saskatchewan, Alberta, Canada Nickel graphite conductive fillers have been replacing conventional silver-based fillers in EMI shielding gasket materials. Filled elastomer shielding gaskets include extrusions, molded shapes, die cut … [Read more...]
EMC Management and Design in Military and Aerospace Systems—Avoiding the Pitfalls
A systematic approach to EMC engineering and management is the best way of achieving compliance. A.S. De Beer, Ph.D Ruphus Technologies (Pty) Ltd., Lonehill, South Africa ABSTRACT This article focuses on the necessity of following a systematic engineering approach in the design and testing of military and aerospace systems that must comply with stringent EMC Standards. It … [Read more...]
ISO/IEC 17025: General Requirements for the Competence of Testing and Calibration Laboratories – A Comparison of the First and Second Editions
Use of the new international laboratory standard should assure greater consistency between laboratories, testing and calibration. Daniel D. Hoolihan Hoolihan EMC Consulting, Lindstrom, MN, USA The First Edition of ISO/IEC 17025 was released in 1999 and the Second Edition was released in 2005. Both editions of 17025 rely heavily on an earlier version of a similar international … [Read more...]
Optimizing EMI Filters Using Circuit Simulation
Simulation saves time, money, and effort in resolving EMI problems in any application. Chris Debraal Curtis Industries Milwaukee, WI The insertion loss of a power line EMI filter can be accurately predicted over a wide range of frequencies through circuit simulation. While analyzing the circuit, it is important to consider test modes and impedances, basic component values, … [Read more...]
EMC Pre-testing Simplifies NEBS Compliance
Introduction NEBS was developed by Bell Labs in the 1970s to standardize equipment that would eventually be installed in a phone company's central office (CO). Sorting out the acronyms, NEBS stands for "Network Equipment-Building System," a term used to describe the environment of a typical Regional Bell Operating Company (RBOC). To get a basic understanding of NEBS, visit … [Read more...]
Recent Improvements on Dual-Ridged Horn Antennas
Improved gain and pattern behavior of these horns makes them ideal for use in other applications outside of EMC. Vicente Rodriguez ETS-Lindgren, Cedar Park, TX, USA For over 40 years dual-ridged horn antennas have been the most common broadband horn used in EMC applications. These antennas are common in the EMC community in their 200-MHz to 2-GHz version and the 1-GHz to … [Read more...]
CISPR >1 GHz Antenna Calibration: Round Robin Summary
Laboratory data demonstrate the need for an international standard on EMC antenna calibration KEN HALL THIS ARTICLE PRESENTS the FINAL results of the antenna inter-laboratory calibration comparison that was spearheaded by Hewlett-Packard between September 2002 and February 2005. Six above 1-GHz antennas were circulated to eleven antenna calibration facilities. The summary … [Read more...]
ISO/IEC 17025: General requirements for the competence of testing and calibration laboratories—a comparison of the First and Second editions
Use of the new international laboratory standard should assure greater consistency between laboratories, testing and calibration DANIEL D. HOOLIHAN THE FIRST EDITION of ISO/IEC 17025 was released in 1999 and the Second Edition was released in 2005. Both editions of 17025 rely heavily on an earlier version of a similar international document; ISO/IEC Guide 25:1990 – General … [Read more...]
Developments in Lightning Test Standards for Aircraft Avionics
Test standards are running behind the fast pace of technological change Nicholas Wright, EMC-Partner Laufen, Switzerland Introduction Escalating costs and increasing complexity in modern aircraft have ensured that aircraft design and assembly is now a global phenomena. Today, subsystems can be designed, manufactured, and tested at any location around the world, then shipped to … [Read more...]
ZERO GROUND Flexible (for EMI/RFI) Shielded Conduits
ZERO GROUND Flexible (for EMI/RFI) Shielded Conduits eliminate the need for costly, with long lead times and high minimum runs, custom shielded composite assemblies. These conduits are patent pending, utilize industry standard connectors, with most rated for direct burial and provide an excellent solution for those looking to effectively shield internal cables while providing … [Read more...]
