Philip Keebler, Kermit Phipps, Frank Sharp, EPRI Lighting Laboratory For years, lighting systems have been operating as stand-alone loads without the use of sophisticated lighting controls for energy savings in all types of facilities—residential, commercial, and industrial. Utilities and end users viewed lighting controls in the past as, luxury, systems that were used only … [Read more...]
Differential Transfer Impedance of Shielded Twisted Pairs
Michel Mardiguian, EMC Consultant, Saint-Rémy-lès-Chevreuse, France The concept of Shield Transfer Impedance (Zt), introduced by S. Schelkunoff in 1934, is a very convenient parameter for the prediction and control of EMI coupling through cable shields. Although widely applied to coaxial cables against EMI susceptibility problems, the Zt parameter can be easily extended to … [Read more...]
EMC Performance of a Product Over Its Lifetime
Gert Gremmen, Tim Haynes, Ralph McDiarmid, Ed Price, John Woodgate EMC performance of a product is likely to vary with age as the physical characteristics change, e.g. caps dry out and metal junctions oxidize, etc. Obviously, the product is designed with the intention of consistent compliance over the life of the product, but are there any requirements or guidance relating to … [Read more...]
Effective EMC Troubleshooting with Handheld Probes
EMC testing is an unavoidable part of the development cycle for electronic products. As clock frequencies continue to increase, radiated emissions get harder to control. In an ideal world, the R&D engineer would test the emissions from his product early in the design stage and retest frequently as design changes were made, just ass he tests whether his product meets its … [Read more...]
1.04m Rod, Antenna Factor and Received Level in MIL-STD 462/461E Compared to MIL-STD 461F Test Set Up
David A. Weston, EMC Consulting, Inc., Merrickville, Ontario, Canada INTRODUCTION This paper shows that the antenna factor of the receiving rod antenna and the E field incident on it, from a standard source of radiation, both change when the counterpoise of the rod is either isolated from the ground plane on the table (new MIL-STD-461F set up), or connected, as per … [Read more...]
Free Datasheet for Xtra-Guard® Performance Cables with Supra-Shield®
Alpha Wire’s premium Supra-Shield shielding system combines a triple-layer aluminum/polyester/aluminum foil with a tinned copper braid shield with tight 70% coverage. Available on Alpha’s flagship Xtra-Guard cable line, Supra-Shield offers exceptional EMI performance and flexibility to protect against noise and maintain overall system integrity. The combination of foil and … [Read more...]
Free White Paper on COTS Alternatives to Mil Spec Conduit Systems
Learn about applications, electrical and physical performance, termination and installation. COTS flexible conduit systems for EMI/RFI mitigation isolate signal or power cables from influencing or being influenced by other components or systems. Cost effective in component cost and installation time, these alternatives are increasingly accepted where Mil Spec is not required. … [Read more...]
Shielded Plastic Connectors Meld Advantages of Metal, Plastic
Amphenol’s new carbon fiber filled plastic C16-3 EMI connector is touted to offer EMI shielding and can be used in applications that previously required metal connectors.The C 16-1/16-3 Series connectors are used in a wide variety of industries and equipment. Some of these include industrial machines and controls, data processing, instrumentation and test equipment, medical … [Read more...]
Over 150,000 Cables Help Allied Forces Defeat IEDs
The critical systems U.S. soldiers, sailors, airmen and marines use to jam radio-controlled improvised explosive devices (IEDs) rely on RF cables designed and manufactured at the Megaphases facility in Stroudsburg, Pa. Over 150,000 MegaPhase cables are in use protecting the Warfighter in overseas contingency operations. These cables are used in tens of thousands of jamming … [Read more...]
EMI Suppression Cores for Flex Circuits and Ribbon Cables
The Flex Circuit and Ribbon Cable Core Kit was created for suppression of frequencies from 25 to 500 MHz utilizing Fair-Rite Products popular 43 material. The kit contains 11 solid cores and five split cores in various sizes. The addition of our new low profile core provides a space savings solution to noise attenuation on the Flex Printed Circuits.Read more from Fair-Rite … [Read more...]
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