In late 2011, The International Standards Commission's (IEC's) Special Committee on Electromagnetic Interference (CISPR) passed a Final Draft International Standard (FDIS) which had been under development for a number of years. The FDIS was actually developed by CISPR's Subcommittee I - Electromagnetic Compatibility of Information Technology Equipment, Multimedia Equipment … [Read more...]
Christmas Music in the Chamber
How a sprinkler system brought radio noise to a chamber and the techniques used to find and remove it. Candace Suriano and John Suriano Auburn Hills, Michigan, USA Anechoic and semianechoic or ALSE (Absorber Lined Shielded Enclosure) chambers are supposed to prevent radio signals and other radiated noise in the environment from being detected inside the chamber. A chamber … [Read more...]
The HF Current Probe: Theory and Application
This article describes one of the most valuable tools in the EMC engineer's “bag of tricks” – the high-frequency current probe. Current probes are invaluable for measuring high-frequency common-mode (or “antenna”) currents flowing on wires or cables. Experience has proven that poorly terminated (bonded or filtered) cables are the no. 1 cause for radiated emissions failures at a … [Read more...]
The Urgent Need to Integrate EMC and Product Safety into Engineering Curriculum of Technical Universities
There is an evolution in the study of electromagnetic field effects on electrical and electronic products and systems. It is progressing from an engineering art to an engineering science. The complexity and sophistication of newer technology products has added to an increased need for more consideration of EMC and Product Safety issues. These factors have increased the … [Read more...]
EMC at IC Level – Part 2: Determination of IC EM Emission Characteristics
Note: The below article has been translated from German and can be found in its original language in the 2012 EMC Europe Guide. Part 1 of this article can be found here. INTRODUCTION The successful development of electronics with good EMC characteristics today largely depends on the EMC behavior of the ICs used. Part 1 of this paper, titled “Pulse Immunity of ICs in … [Read more...]
Automotive RF Immunity Test Set-up Analysis: Why Test Results Can’t Compare
Mart Coenen, EMCMCC bv, Eindhoven, the Netherlands Hugo Pues, Melexis NV, Tessenderlo, Belgium Thierry Bousquet, Continental, Toulouse, France ABSTRACT Though the automotive RF emission and RF immunity requirements are highly justifiable, the application of those requirements in an non-intended manner leads to false conclusions and unnecessary redesigns for the electronics … [Read more...]
Why Are There So Many EMC Standards?
Steve Hayes, TRaC Global, Worcestershire, United Kingdom; Jack McFadden, Wyle Laboratories, Huntsville, Alabama, USA; Steve O’Steen, Advanced Compliance Solutions, Atlanta, Georgia, USA; Kenneth Wyatt, Wyatt Technical Services, Woodland Park, Colorado, USA; David Zimmerman, Spectrum EMC Consulting, Eagan, Minnesota. October 2011 sees the end of the transitional period from … [Read more...]
Transient Voltage Suppressors (TVS) for Automotive Electronic Protection
Soo Man (Sweetman) Kim, Vishay Intertechnology, Inc., Malvern, Pennsylvania, USA A major challenge in automotive design is protecting electronics – such as control units, sensors, and entertainment systems – against damaging surges, voltage transients, ESD, and noise that are present on the power line. Transient voltage suppressors (TVS) are ideal solutions for automotive … [Read more...]
Designing Electronic Systems for EMC: Grounding for the Control of EMI
There are two primary reasons for grounding devices, cables, equipment, and systems. The first reason is to prevent shock and fire hazards in the event that an equipment frame or housing develops a high voltage due to lightning or an accidental breakdown of wiring or components. The second reason is to reduce EMI effects resulting from electromagnetic fields, common impedance, … [Read more...]
EMC and the Smart Grid
In April 2011 this author published an article dealing with the threats and potential impacts to the future U.S. Smart Grid from high power electromagnetic (HPEM) threats including High-altitude Electromagnetic Pulse (HEMP) from a nuclear detonation in space over the U.S., Intentional Electromagnetic Interference (IEMI) from terrorists or criminals who may attack and create … [Read more...]
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