There are two primary reasons for grounding devices, cables, equipment, and systems. The first reason is to prevent shock and fire hazards in the event that an equipment frame or housing develops a high voltage due to lightning or an accidental breakdown of wiring or components. The second reason is to reduce EMI effects resulting from electromagnetic fields, common impedance, … [Read more...]
Acoustic Fiber Optic Monitoring System for Bridges
Pure Technologies Ltd.’s new next-generation SoundPrint® system monitors bridge cables and post-tensioning systems. The system, called SoundPrint Light, utilizes Pure’s patented acoustic fiber-optic monitoring technology for monitoring prestressed concrete pipelines. SoundPrint Light is an optical-based system; therefore, it is immune to electromagnetic interference. This … [Read more...]
New Family of Coaxial Lightning Arrestors
NexTek, Inc. announces a new family of coaxial lightning arrestors designed to operate at frequencies up to 11 GHz. The SurgeGuard™ PTC-TNF-SAF-20G is a gas discharge tube-type lightning arrestor with TNC to SMA connectors. This PTC series surge suppressor is designed for use in DC to 11GHz microwave applications and provides industry-leading performance characterized by very … [Read more...]
New Lightweight Backshell for Subminiature Connectors
Positronic Industries has developed a new generation backshell for D- subminiature connectors. The “A” series backshell combines a number of features that meet the needs of many of today’s most challenging requirements for EMI/RFI protection for cable connectors. “A” Series backshell features lightweight aluminum material with a zinc content of less than 1%, an important factor … [Read more...]
New Composite Shell Circular Connectors for Low Weight Applications
Spectrum Control’s new composite connector series feature shells fabricated from high grade thermoplastic. Designed to displace traditional metal connector shells for substantial weight reduction, this new addition to the Spectrum Control product line offers composite shell versions of its circular connectors in MIL-38999 series III and IV, available EMI filtered or … [Read more...]
Electromagnetic Interference in the Data Center: To Shield Or Not To Shield
Jordi Ferri, Shielding, Power & Cooling Division Manager, Advanced Shielding Technologies Europe S.L. (AST), Barcelona, Spain INTRODUCTION When designing a data center, many things need to be taken in account. One of them is availability and downtime depending on desired Tier configuration (see Table 1). For Tier III and Tier IV data centers, apart from redundancy of the … [Read more...]
Calibration of Toroidal Current Measurement Probes at High Frequency
Alastair R. Ruddle, Ph.D., MIRA Ltd., Nuneaton, UK Toroidal current transducers are widely used in EMC measurements, both for monitoring currents flowing on single cables or cable bundles and for injecting currents onto such cables or cable bundles. The latter forms the basis of a well-established approach to susceptibility testing (bulk current injection) that is used in the … [Read more...]
EMC Testing above 1 GHz: The Deadline Looms
When first mandated in the 1990s, the stated objective of the EU’s Directive governing EMC was, in broad terms, that commercial and domestic equipment, and certain industrial systems, should neither cause interference or be susceptible to interference. They should not emit radiated or conducted energy at RF frequencies and they should be immune to such emissions, within … [Read more...]
New Engineering Kit, EMI Suppression Cores for Flex Circuits and Ribbon Cables
Fair-Rite Products' 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 eleven 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.Learn … [Read more...]
IEC Releases RF Connectors Standard
IEC 61169-35:2011(E) provides information and rules for preparation of detail specification of 2,92 series RF coaxial connectors together with the pro-forma blank detail specification. It also prescribes mating face dimensions for high performance connectors - grade 1, dimensional detail of standard test connectors - Grade 0, gauging information and tests selected from IEC … [Read more...]
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