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Interference Technology

For EMI / EMC Engineers

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Analysis on Shielding Effectiveness of Board Level Shielding with Apertures

 

Brian She Laird Technologies ABSTRACT There is a growing need to evaluate the shielding effectiveness (SE) of board level shielding (BLS). By means of a reverberation chamber, we performed a series of shielding effectiveness test for board level shielding products with different apertures. In addition, an analytical SE formulation has been developed in comparison with … [Read more...]

The First Practical Approach to EMC for Functional Safety (EMC Risk Management)

 

Keith Armstrong Cherry Clough Consultants Ltd. There are now many standards on Functional Safety (Risk Management) that apply to relevant electronics, including IEC 61508 [1] and the standards developed from it listed in Section II of [2], and ISO 14971 [3]. They all require that EMI be dealt with, but complying with emissions and immunity EMC test standards, even using … [Read more...]

Using the Reverberation Chamber to Measure Total Radiated Power for EMF Assessments

 

NOTE: This article has been translated from Dutch to English. It can be found in its original language in the 2014 Europe EMC Guide. Konika Banerjee, Marcel van Doorn and Pierre Beeckman, Philips Innovation Services, Quality & Reliability Engineering - EMC Center, High Tech Campus 26, 5656 AE Eindhoven, The Netherlands ABSTRACT Multimedia products need to comply with … [Read more...]

Practical EMC Filter Design and Optimization

 

NOTE: This article has been translated from German into English. It can be found in its original language in the 2014 EMC Europe Guide. Tobias Hofer EMC Consultant HSI Elektonik AG Switching power supplies can be found in nearly all electronic devices. The efficiency should be as high as possible. The no load condition should be in the milliwatt range. In contrast to that, … [Read more...]

New Techniques in Shielding for EMI

 

NOTE: This article has been translated from Spanish to English. It can be found in its original language in the 2014 Europe EMC Guide. Tim Fornes, Ph.D. Senior Staff Scientist, Chemical Research LORD Corporation Electromagnetic interference (EMI) is an unwanted disruption in the communication of an electrical device caused by foreign electromagnetic waves. Such foreign waves … [Read more...]

2014 EMC Europe Guide

 

Welcome to the the 2014 Interference Technology EMC Europe Guide. In this issue, you will find articles on Using the Near Field Measurement to Reduce Investigation Time and Cost; Correction Factors of Near-Field Probes and their Application in EMC; Using the Reverberation Chamber to Measure Total Radiated Power for EMF Assessments; Power Grid, Mains Filtering and Power Line … [Read more...]

E3 Risk Gap Analysis or Once More into the Breech!

 

Assessing the EMC-related risk of using commercial items (CI or COTS, as they are known) has long been a pet project of mine. So, I received a question lately that went something like this (paraphrasing the main points):I am aware the risk analysis or gap analysis is part of the process for analyzing the risk severity depending on test methods, level, frequency coverage … [Read more...]

Wi-Fi Anyone?

 

So I found another item of EMI interest to whine - I mean write - about: EMI in legacy equipment. You can find the article in question here.In a nutshell, the FAA wants certain older cockpit displays (made by Honeywell) replaced because they believe them to be susceptible to interference from Wi-Fi systems that are going on board many aircraft today. It’s an interesting … [Read more...]

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