Affordable transient protection is now available within electronic connectors Chris Noade, Syfer Technology Limited Arminghall, Norwich UK "Connectors contribute nothing to electronic equipment" is an old and contentious statement that raised a few hackles when written, but is now undisputedly outdated and wrong! A modern connector, in isolation, can fulfill the equipment … [Read more...]
Simulation of In-Vehicle Human Exposure to Electromagnetic Fields from On-Board Transmittors
Numerical models can provide data from enormous numbers of points and for a number of human simulants Alastair R. Ruddle, PH.D., MIRA Limited Nuneaton, UK On-board transmitters are already commonly encountered in the vehicle environment; typical examples include mobile telephones, Bluetooth systems, and communications equipment used by the emergency services and armed forces. … [Read more...]
Solving the Galvanic Corrosion Issue in EMI Shielding
Tungsten carbide/aluminum composite particles inhibit galvanic corrosion of aluminum. An on-going issue in the design of reliable EMC shielding is galvanic corrosion of aluminum. How can an aluminum frame be protected from galvanic corrosion if it contacts an EMI gasket containing non-aluminum particles? Chromate conversion coatings have long been used to reduce the corrosion … [Read more...]
Off-Chip Decoupling Measures: The EMC Perspective
Off-chip decoupling, or buffering, is a necessity. Over the years, many papers and articles have been written about optimizing off -chip IC decoupling. Many IC vendor application recommendations feature a cluster of decoupling capacitors adjacent to the IC, in close proximity to one another—viz. an electrolytic capacitor along with a small and a large value ceramic capacitor … [Read more...]
On-site EMF Testing of an Emergency Network Communications Vehicle
Thorough testing requires taking measurements both inside and outside the vehicle. David A. Case, Jaime McLain and Murry Gavin Cisco Systems, Inc., Richland, Ohio, USA Experienced compliance test personnel are familiar with the usual spate of RF issues. Tasks range from performing MPE (maximum permissible exposure) studies and SAR (specific absorption rate) testing to … [Read more...]
Simulation of In-vehicle Human Exposure to Electromagnetic Fields Due to On-board Transmitters
Numerical models can provide data from an enormous number of points and for a number of human simulants. Alastair R. Ruddle, Ph.D. MIRA Limited, Nuneaton, UK On-board transmitters are already commonly encountered in the vehicle environment: typical examples include mobile telephones, Bluetooth systems, and communications equipment used by the emergency services and armed … [Read more...]
Product Environmental Regulatory Compliance: The Current Status Worldwide
The drive to protect the environment and to conserve natural resources has brought about a proliferation of regulations. Tony Dibiase Spec-Hardened Systems, Rochester, NY, USA INTRODUCTION As the clamor for better and newer electronic products continues worldwide, there is increased concern over landfills accepting growing “mountains” of discarded electronic products. … [Read more...]
Ensuring Electromagnetic Compatibility (EMC)
The IEC coordinates a worldwide system for testing electrical equipment. International Electrotechnical Commission Geneva, Switzerland How does a hospital manager know that equipment such as a CAT scanner, when operating, will not affect nearby electromagnetic systems in the building, such as an X-ray machine, thereby potentially putting patients at risk? Since the early … [Read more...]
Test Beyond the Specs: Why Test Higher in Frequency and Field Strength?
IEC 61000-4-3: 2006's frequency escalation Jason Smith and Pat Malloy AR RF/Microwave Instrumentation, Souderton, PA, USA An increasing number of new and proposed EMC standards are pushing the upper frequency test limits higher into the microwave spectrum. The latest EMC standard released, IEC 61000-4-3: 2006, is no exception. The upper frequency test limit has been increased … [Read more...]
Don’t Settle for Being Just an E3 Engineer—Become an E3 Advocate!
INTRODUCTION It is often the accepted practice for the E3 engineer on a program simply to provide his technical expertise on meeting EMI, EMC, EMP and other E3 requirements and to let others take the recommendations from there. Once the analysis and recommendations are complete, the decisions on how to implement the design are up to the platform design team. The truth be … [Read more...]
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