Utilities operating nuclear power plants have been dealing with electromagnetic interference (EMI) problems for over two decades. Many early problems that affected the operation of instrumentation and control (I&C) equipment in plants stemmed from the use of wireless transmission devices (WTDs) (e.g., radio walkie-talkies, cellular phones, etc) inside the plant in the … [Read more...]
Shortcomings of Simple EMC Filters
Oversimplification of EMC filter selection to reduce size and cost can often be a false economy as anticipated performance may not be achieved. INTRODUCTION EMC design principles are best considered at the equipment design stage, where good mechanical design including component layout and cable routing can help reduce EMC problems at source. Even with good EMC practice, it is … [Read more...]
Antenna-to-Antenna Coupling On An Aircraft: Mitigation Techniques
The number of RF systems available for use in mission specific aircraft has grown dramatically over the last few decades, with numerous systems operating across very wide bandwidths (some covering almost the entire 1MHz to 40GHz range). Compatibility issues have become almost a certainty on all but the simplest of aircraft installations, and numerous mitigation techniques have … [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...]
New Filter Modules for DC-DC Railway Applications
Vicor Corporation announced two new 500W additions to its family of Filtered Input Attenuator Modules (FIAMs) for railway applications. The new FIAM110 and FIAM072 provide protection for on-board equipment and systems against the effects of power-line transients, EMI (electromagnetic interference) and excessive in-rush currents. Learn more from Vicor. … [Read more...]
UL Standard on Filters Helps Provide Assurance on Safety Issues
Arguably the two biggest offenders in custom electronics hyperbole are the cabling and power conditioning/surge suppression categories. Other than power cables, the topic of cabling safety has always been innocuous because of the products’ low-voltage characteristics. Taking the safety issue to the next level, however, are power conditioner/surge suppressor components that are … [Read more...]
Semiconductor Devices Filter Standard
IEC 62047-7:2011 describes terms, definition, symbols, configurations, and test methods that can be used to evaluate and determine the performance characteristics of BAW resonator, filter, and duplexer devices as radio frequency control and selection devices. This standard specifies the methods of tests and general requirements for BAW resonator, filter, and duplexer devices of … [Read more...]
Application Guide Features Electronic Components for Automotive Applications
TDK-EPC has published the EPCOS Application Guide 2012 – Electronic Components for Automotive Convenience Applications.The 24-page, full-color brochure features: Aluminum Electrolytic Capacitors Ceramic Transient Voltage Suppressors (CTVS) – Cera Diodes Ceramic Transient Voltage Suppressors (CTVS) – MLVs and SHCVs Ferrites Film Capacitors (medium power) Microwave Ceramic … [Read more...]
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