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 Dip Tube
A formalized materials qualification process is essential in preventing non-conforming or suspect counterfeit packaging that can lead to ESD hazards during parts inspection process, long-term storage issues and failures in manufacturing. Robert J. Vermillion, CPP/Fellow, RMV Technology Group, LLC, NASA-Ames Research Park, Moffett Field, CA The aerospace community has made … [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...]
Protection of Variable Speed Drives Utilizing the Cascade Protection Approach
In today’s competitive industrial environment, maximization of operations is essential, and companies cannot risk system malfunction or potential failure due to power disruptions. The end result can be disastrous, ending in loss of production, profits, clientele, and ultimately, complete operational failure. This makes the quality of power of vital importance. Consequently, … [Read more...]
Extending the Concept of Common Mode Noise: Single Mode
Electronic switching circuits are used for power conversion, data communication and other applications. According to the theory of Fourier Transform, in these circuits, the periodical change of the current/voltage produces harmonics in a wide frequency spectrum. The resultant currents of these harmonics are called conducted emission (CE), and are categorized classically as … [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...]
Radiated Emission Measurements at 1/3/5/10/30 Meters
Daniel Hoolihan, Hoolihan EMC Consulting, Lindstrom, MN Trend shifts towards making measurements at antenna distances closer and closer to the equipment-under-test. INTRODUCTION There are two principal types of emission measurements in the world of electromagnetic compatibility: conducted emission and radiated emission. The conducted emission measurements are either a … [Read more...]
