This is only the second time around so you already know this blog is new, and I won’t have to remind you. Previously I made some comments about crowding and protecting the RF spectrum. It’s really difficult to protect it because there are organizations that feel a need to utilize RF communications to eliminate jobs and increase profitability. I once had a boss … [Read more...]
Protecting the Earth’s Limited Resources
May marks the dawn of a new blog created by Interference Technology with emphasis on Electromagnetic Compatibility. I am honored to have been asked to serve as the blogger in this newest venture to reach out to members of the community. I have written many articles over the years and have always strived to make them purely technical, easily readable, and non commercial. This … [Read more...]
Welcome!
Welcome to the EMC Zone, an avenue for discussion on the current issues affecting today’s EMC industry.This inaugural posting concerns a hot topic in the industry - the current state of revision to Medical Standard 60101, specifically as regards proposed changes to the RF immunity stress levels / test-bands.At last year’s Long Beach symposium, the word around the water cooler … [Read more...]
EMC Antenna Parameters and Their Relationships
*originally published in June 1997. Introduction The basics of the EMC profession often get buried under the day-to-day effort of continuous measurement and the volume of test and reporting paperwork. The fundamental parameter of the most common of technical tools, the EMC antenna, is used over and over without thought as to its actual meaning. This parameter is the antenna … [Read more...]
Fundamentals of EMC Design: Our Products Are Trying To Help Us
INTRODUCTION We often design electronic products only to find that when we test them for electromagnetic compatibility (EMC), their emissions and/or immunity are not as good as we need them to be. Usually, at this time, we feel as if we are fighting against the laws of physics to contain the conducted and radiated emissions, or to reduce susceptibility. But in fact the laws of … [Read more...]
Avionics Testing Evolution
Nicholas Wright, EMC Partner AG, Laufen, Switzerland Many disturbance sources can affect the correct functioning and therefore the safety of an aircraft. The latest commercial airliner designs include many technological changes that have necessitated a review of avionic system test requirements. The trend today is to move toward structures made from Carbon Fiber Reinforced … [Read more...]
Protecting Security Systems in a Healthcare Facility from Lightning Induced Transients
A healthcare facility is a multifunctional building or campus that provides health care to citizens and when designated, also provides protection to the population in times of crisis. This includes common functions associated with patient care (e.g. operating rooms, emergency rooms, recovery rooms, etc), but also areas for educational centers, exercise facilities, food service, … [Read more...]
Simple Method for Predicting a Cable Shielding Factor, Based on Transfer Impedance
For a shielded cable, an approximate relationship valid from few kHz up to the first cable resonance can be derived from its Transfer Impedance (Zt) allowing to predict the cable shielding factor. This Cable Shielding factor, as a figure of merit, is often preferred by engineers dealing with product specifications and early design. Being not necessarily EMC specialists, they … [Read more...]
Eliminating the Need for Exclusions Zones in Nuclear Power Stations
Utilities operating nuclear power plants have been dealing with electromagnetic interference (EMI) problems for over two decades. Many early problems that affected the operation of instrumentation and control (I&C) equipment in plants stemmed from the use of wireless transmission devices (WTDs) (e.g., radio walkie-talkies, cellular phones, etc) inside the plant in the … [Read more...]
Shortcomings of Simple EMC Filters
Oversimplification of EMC filter selection to reduce size and cost can often be a false economy as anticipated performance may not be achieved. INTRODUCTION EMC design principles are best considered at the equipment design stage, where good mechanical design including component layout and cable routing can help reduce EMC problems at source. Even with good EMC practice, it is … [Read more...]
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