The IEEE Standards Organization has posted an informative overview of the world’s standards development organizations including the International Electrotechnical Commission (IEC), the International Organization for Standardization (IOS), the ISO/IEC Joint Technical Committee 1 (ISO/IEC JTC 1), the International Telecommunication Union (ITU), the International Telecommunication … [Read more...]
DARPA Seeks to Use EM Waves to Extinguish Fires
DARPA, the Pentagon’s Defense Advanced Research Project Agency, has announced a new research program into “Instant Fire Suppression.” The agency noted that “Fire especially in enclosed military environments such as ship holds, air craft cockpits, and ground vehicles, continues to be a major cause of material destruction and loss of warfighter life. Essentially, there have been … [Read more...]
Snap-In Flange Mount Filters Target High Current Applications
The PBH filter series from Power Dynamics, Inc. (PDI) targets applications with high current (16/20 A) requirements. These filters are available with varying configurations of components and termination styles. They are available in flange mount or snap-in types. The medical filters offer a maximum leakage current of 2 µA at 120 VAC at 120 VAC, 60 Hz. A ground choke can be … [Read more...]
New EMI Filters Comply with DOD’s COTS Directive
The new VPT10-28 (10 A) and the VPT2028 (20 A) have been added to its COTS product line by VPT, Inc. These filter modules provide compliance to MIL-STD-461 C/D/E for conducted emissions in military and avionics DC power systems. Both devices fulfill the DOD’s COTS (commercial-off-the-shelf) directive in terms of cost and stringent military and avionics performance standards. … [Read more...]
Extensive Line of Custom EMI Filters Available
WEMS EMI/RFI Filter Division designs and manufactures high reliability input, output, power line, and signal filters intended for military, aerospace, and high end industrial applications. WEMS services include filter circuit design and analysis, filter packaging and layout, prototype/first article, EMI test assistance, environmental tests, source control drawings, acceptance … [Read more...]
AT&T Signs Five-Year Telecom Contract with Shell
AT&T Inc. has announced that it has won a $1.6 billion contract to provide Royal Dutch Shell Plc., the Netherlands-based oil and gas giant, with advanced telecommunications services. The five-year agreement will see AT&T providing, managing, and maintaining Shell’s worldwide communications infrastructure, while looking after its global mobility needs.AT&T says that … [Read more...]
Magnetic Shielding Design for Manufacturing
Sensitive electronic devices require protection from radiating magnetic fields. David Grilli Magnetic Shield Corporation, Bensenville, IL, USA Magnetic shielding for static and low frequency (<100 kHz), time-varying magnetic fields is accomplished by containing a specific device or item within a sheet metal enclosure of high permeability material. Typically, a sensitive … [Read more...]
Designing an RF Shielded Enclosure
Ron Brewer EMC/ESD Consultant Shielding has been with us a long long time. Early AM radios had shielded RF and IF transformers, shielded electron tubes, and compartmentalized shielded chassis. These shields were necessary to prevent RF pickup, feedback, and oscillation by the electron tubes, radiation from the local oscillator, RF contamination of the IF strip, and … [Read more...]
Utilizing Overlooked Characteristics of Ferrites for Improved Printed Circuit Board EMI Suppression
ABSTRACT While nickel-zinc composition soft ferrites are routinely used for PCB EMI suppression, the consequences of DC and low frequency AC bias on a device's high frequency impedance has not been widely discussed in the EMC and magnetic component literature. Virtually all EMI suppression applications in DC and AC power filter circuits place two-terminal ferrites under … [Read more...]
Spectrum Aeromed Module Passes EMI Testing and Wins Military Air Worthiness Award
North Dakota-based Spectrum Aeromed has announced that its ambulance module was subjected to exhaustive testing requested by the U.S. Air Force. The Spectrum Aeromed ambulance module was subjected to EMI, electrical safety, severe vibration periods, altitude changes, rapid decompression, and environment testing. Following this testing, Spectrum Aeromed equipment was awarded … [Read more...]
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