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Interference Technology

For EMI / EMC Engineers

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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...]

Metal Shell Connector for Military and Commercial Aerospace Applications

 

Heilind Electronics is now stocking TE Connectivity's Quadrax D-Sub connector.TE's Quadrax D-Sub connector for military and commercial aerospace applications features a rugged metal shell construction and Gigabit Ethernet speeds with superior shielding performance. It is available in cable-to-cable and cable-to-board configurations and provides users with a sound solution for … [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...]

CISPR 32: New International Standard on Electromagnetic Emissions from Multimedia Equipment

 

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...]

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...]

3-Line Filters for Frequency Converters

 

TDK-EPC’s new series of EPCOS 3-line EMC filters are designed for frequency converters and other power electronics applications. All types of the B84143*166 series have UL/CSA approval and are designed for currents of 10, 20 or 35 A at rated voltages of 520 or 300 V AC. These filters satisfy protection class IP20 specifications and are suitable for operating temperatures of up … [Read more...]

Coaxial Communication Cables Standard

 

IEC 61196-8-1:2012 is part of the IEC 61196 series and applies to coaxial communications cables described in IEC 61196-8. It specifies the requirements for semi-flexible radio frequency and coaxial cables with polytetrafluoroethylene (PTFE) dielectric. These cables are for use in microwave and wireless equipment or other signal transmission equipment or units at frequencies … [Read more...]

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