The last several posts have been about EM radiation hazards (RADHAZ), but there are other electromagnetic hazards. If you’ve ever been shocked by an ESD jumping from your finger to a doorknob after walking across the carpet on a cold dry winters day just imagine that incident being magnified by multiple orders of magnitude. I live in Florida and we are now winding … [Read more...]
EMI Shielding Provided in a New Housing Structure
Justin Moll Director of Marketing VadaTech, Inc. 702-896-3337 www.vadatech.com MicroTCA is an open-standard embedded computing architecture developed by the PCI Industrial Computer Manufacturer’s Group (PICMG). The technology offers tremendous performance in a small form factor. The design of the systems provides inherent EMI protection for all types of designs and … [Read more...]
Charge Generation of ESD Sensitive Devices: Understanding the Risks of Protective Packaging
Bob Vermillion, CPP/Fellow Certified ESD & Product Safety Control Engineer-iNARTE RMV Technology Group, LLC NASA-Ames Research Center Moffett Field, CA 94035 Several years ago, Ray Gompf, Ph.D., PE (Ret.), NASA, Kennedy Space Center and the author evaluated 7” x 7” ESD corrugated, Kraft and bleached B-Flute corrugated substrates for Tribocharge Generation at low … [Read more...]
Elephant in the Test Room #1 Continued – The ’Get Around’ Explained
Read other posts in the "Elephant in the Test Room" series here.Recap on this ThreadThe room: MIL-STD RF immunity testing – 1-18GHz 200v/mThe elephant: everyone in the room is aware that a significant fraction of the ‘calibrated’ 200v/m test field is actually created at the wrong test frequency.The culprit: Notoriously high ‘start of band’ harmonics produced by all octave band … [Read more...]
Which Came First? The Chicken or the Egg?
I came across an interesting article in ITEM this past week about a Canadian helicopter that apparently has EMI problems. Like most such articles that I come across, I dutifully posted it in a variety of EMC related groups on LinkedIn. I do that for a couple of reasons. First, I believe its always a good idea to circulate relevant information to the EMC community. How can we … [Read more...]
Defending Ethernet Ports from Electrical Transient Events
Timothy Puls Semtech Corporation Ethernet is ubiquitous. From base station backhaul, to wireless access points, to IP surveillance cameras – Ethernet is found everywhere. And, the devices enabling this Ethernet traffic – the miniature transceiver ICs driving the communications infrastructure – are more advanced than ever before. Before 2010, Ethernet physical-layer … [Read more...]
A National Plan for EMP Protection (Part 1)
Don White Consultant, Don White Consultants Jerry Emanuelson Consultant INTRODUCTION This article has two parts. It begins with a brief EMP historical review demonstrating the field strength threat that must be shielded against in order to assure survival of electrical and electronic items and systems, and the retention of our modern lifestyle. Next comes planning, … [Read more...]
CMOS is Different: PCB Design for Both Low Noise and Low EMI
Earl McCune, RF Communications Consulting ABSTRACT Achieving low power supply noise does not automatically assure low EMI. Fortunately a PCB layout designed for low EMI does automatically result in low noise. The techniques presented here do achieve both goals. INTRODUCTION Much has been written, spanning several decades, on how to design printed circuit layouts for low … [Read more...]
2013 EMC Test & Design Guide
Welcome to the the 2013 Interference Technology EMC Test & Design Guide, where you will find articles on PCB design for low noise and low EMI; Defending Ethernet Ports from Electrical Transient Events; Part One of a National Plan for EMP Protection; a feature story on EMC employment and a world-wide test lab directory. View the issue here. … [Read more...]
Elephant in the Test Room #1 Continued – The List of Practical Solutions
Read other posts in the "Elephant in the Test Room" series here.Recap on this threadThe room: - MIL-STD RF immunity testing – 1-18GHz 200v/mThe elephant: - everyone in the room is aware that a significant fraction of the ‘calibrated’ 200v/m test field is actually created at the wrong test frequency.The culprit: - Notoriously high ‘start of band’ harmonics produced by all octave … [Read more...]
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