Dr. John Papandriopoulos, an Australian researcher, has announced a technique to boost broadband speeds on ordinary DSL lines by up to ten times. The Ph.D. thesis Papandriopoulos wrote at the University of Melbourne outlines an algorithm that reduces crosstalk interference on copper phone lines. Dr. Papandriopoulos will soon join the staff of Silicon Valley-based ASSIA founded … [Read more...]
PPM Becomes UK Distributors for Group 3 Technology, New Zealand
PPM Ltd has been appointed the exclusive UK Distributor for Group 3 Technology in New Zealand. These products allow a low cost point-to-point link for analog and digital information. A suite of software drivers for use with LabView, or other control software packages are also available, allowing users to drive and read back information with almost any type of transducer. This … [Read more...]
Using A Transmission Line Model To Analyze Shield Current Distribution Resulting From Bulk Current Injection (BCI)
Arthur J. Glazar, Life Senior Member IEEE Background Radio frequency (RF) signal energy is normally confined to the interior of a coaxial cable. RF currents on the surface of a cable shield are undesirable and generally indicate a problem. Shield surface currents can occur as the result of conducted susceptibility (CS) or radiated susceptibility (RS). Whatever their … [Read more...]
Fibrous Dust Testing – Genesis and Successful Reproduction of a Menace
Testing services and equipment are now available to analyze designs for fibrous dust susceptibility. Dan Willemin Professional Testing Incorporated, Round Rock, TX, USA Accumulations of dusts have always hampered cooling, to some extent, but dusts and electronics cooling problems of the past usually involved industrial or military applications. To understand why dust has … [Read more...]
Normalized Site Attenuation (NSA) for Semi-Anechoic Chambers
A new modeling technique takes into account the near-field effect. Gwenaël Dun and Jean-François Rosnarho SIEPEL, La Trinité sur Mer, France The quality of a semi-anechoic chamber for radio-noise emission measurements can be deduced from the difference between the attenuation in an Open Area Test Site (OATS), called Normalized Site Attenuation (NSA), and this same … [Read more...]
EMC Management and Design in Military and Aerospace Systems—Avoiding the Pitfalls
A systematic approach to EMC engineering and management is the best way of achieving compliance. A.S. De Beer, Ph.D Ruphus Technologies (Pty) Ltd., Lonehill, South Africa ABSTRACT This article focuses on the necessity of following a systematic engineering approach in the design and testing of military and aerospace systems that must comply with stringent EMC Standards. It … [Read more...]
Optimizing EMI Filters Using Circuit Simulation
Simulation saves time, money, and effort in resolving EMI problems in any application. Chris Debraal Curtis Industries Milwaukee, WI The insertion loss of a power line EMI filter can be accurately predicted over a wide range of frequencies through circuit simulation. While analyzing the circuit, it is important to consider test modes and impedances, basic component values, … [Read more...]
EMC Pre-testing Simplifies NEBS Compliance
Introduction NEBS was developed by Bell Labs in the 1970s to standardize equipment that would eventually be installed in a phone company's central office (CO). Sorting out the acronyms, NEBS stands for "Network Equipment-Building System," a term used to describe the environment of a typical Regional Bell Operating Company (RBOC). To get a basic understanding of NEBS, visit … [Read more...]
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