The International Electrotechical Committee recently released the IEC 62153-4-1 standard covering the electromagnetic compatibility testing methods for metallic Communications cables. This second edition, according to the IEC, cancels and replaces the first edition published in 2003. The significant change is a new clause on the background of the shielded screening attenuation … [Read more...]
The Square Shielded Magnetic Loop
Simple square wire loops may be well suited for injecting signals into circuit boards by inductive coupling. Douglas C. Smith, D.C. Smith Consultants, Los Gatos, CA CONSTRUCTION DETAILS Square magnetic loops are very useful troubleshooting tools. This article will describe the construction and characteristics of shielded magnetic loops and compare them to unshielded magnetic … [Read more...]
The IET’s Guide on EMC for Functional Safety
When correctly applied, real financial savings can be expected, along with a significant reduction in financial risks. Keith Armstrong, Cherry Clough Consultants, Stafford, UK Electronic complexity is increasing with no end in sight, increasing self-generated noise levels, while the feature sizes in silicon integrated circuits continue to shrink, making them emit more noise … [Read more...]
2010 Update on IEMI and HEMP
INTRODUCTION It has been three years since the state of the art dealing with IEMI and HEMP has been updated in the Interference Technology Annual EMC Guide in 2007 [1]. A significant amount of work has been accomplished worldwide during this period. This paper will review significant special sessions and tutorials at International EMC Conferences, published papers and reports, … [Read more...]
COTS Alternatives to MIL SPEC Flexible Conduit Systems for EMI/RFI Containment
Applications, electrical and physical performance, termination and installation factors of shielded flexible conduits. Linda Sardone, Zero Ground Electronic solutions for military and government equipment and installations are expanding rapidly, and the need for supplemental shielding of cable runs via conduit is moving beyond traditional applications requiring MIL SPEC … [Read more...]
In-situ EMC Testing Using Surface Current Sense Wires
Mart Coenen, EMCMCC bv, Eindhoven, the Netherlands Tim Maas, ASML bv, Veldhoven, the Netherlands Yili Hu, Student Eindhoven University of Technology, the Netherlands Arthur van Roermund, Eindhoven University of Technology, the Netherlands ABSTRACT In-situ EMC testing is, for large fixed systems and installations within the scope of the European EMC Directive, not a primary … [Read more...]
Choosing the Right Chamber for Your Test Requirements
Martin Wiles, Vince Rodriguez, ETS-Lindgren Developments within standards community has led to new chamber validation procedures above 1 GHz and alternative test methods using FARs. INTRODUCTION Anechoic chambers are used today for performing EMC measurements according to a variety of published EMC standards. There are many different fields of application, including … [Read more...]
Surface Scan on IC Level with High Resolution
Measuring of near field above ICs or open DIEs with precisely positioned microprobes is a new tool for engineers to detect and solve EMI levels. Jörg Hacker, Langer EMV-Technik GmbH, Bannewitz, Germany ABSTRACT Today, engineers have less time to develop electronic circuits. The time to market is getting shorter and the requirements on the products are increasing. It means … [Read more...]
Egregious Errors in Electromagnetic Radiation Evaluation
Reasons for widely differing results in commercial radiated emission measurements. MIL-STD-461 RADIATED EMISSION MEASUREMENTS In 1967, the first version of MIL-STD-461 was introduced. Radiated emission measurements were allowed outside of a shielded room but due to the low levels of radiated emission limits, compared to an average ambient, measurements were invariably made … [Read more...]
IEC’s New RF Connector Standard Released
The International Electrotechnical Committee (IEC) has released a standard on blind mating RF coaxial connectors.Preview this standard at the IEC website. … [Read more...]
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