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Interference Technology

For EMI / EMC Engineers

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The Effects of the New ESD Standard on ESD Simulators

 

Bruno Straumann, Senior Development Engineer,Haefely Test AG Basel, Switzerland. INTRODUCTION The new IEC 61000-4-2 Edition 2 standard, which replaces IEC 61000-4-2 Edition 1 1995, was initially announced in December 2008. Based on the revised IEC standard, the identical European standard EN 61000-4-2:2009 was also released. The new EN standard can already be applied for ESD … [Read more...]

HEMP Filter Design To Meet MIL -STD-188-125 PCI Test Requirements

 

ABSTRACT Philosophies for the best method of HEMP protection have been around for a long time. MIL-STD-188-125 -1 and -2 are more recent specifications for defining requirements for HEMP protection. They specify PCI (pulse current injection) testing techniques to demonstrate the integrity of the protection system, but require specialist test equipment capable of injecting high … [Read more...]

3-Phase AC Filters Rated at 75ºC – Free Datasheet

 

Schurter now offers an assortment of filters with ambient temperature ratings at 75ºC. The filters have cURus and ENEC approvals ranging from 6A at 275/480 VAC to 1100A at 480/520 VAC, according to derating curves at 40-50ºC and 75ºC. Applications such as frequency converters, stepper motor drives, UPS system and inverters are ideally suited for these filter products. … [Read more...]

Tunable RF Filters for Next-Generation Radio Communications and Radar

 

Active Spectrum has announced what it touts as a breakthrough in tunable filter technology for co-site interference mitigation in next generation wireless communication systems and radar. According to the announcement, the new miniature tunable filters have the capability for isolating transmit and receive signals, including low insertion loss (1.0dB), high RF power handling … [Read more...]

Automotive Power MOSFETs Limit EMI

 

International Rectifier’s automotive DirectFET power MOSFETs are optimized with low gate charge for switching applications. Low parasitic inductance provided by the DirectFET power package results in excellent high frequency switching performance with reduced waveform ringing which in turn helps limit EMI and filter size.These first automotive DirectFET2 devices from IR are … [Read more...]

Holding Steady

 

As the economy gained momentum in late 2009 and early 2010, engineering organizations, like every other business sector, sensed promise that a strong, self-sustaining recovery was kicking in. However, as government spending to stimulate the economy trailed off and businesses concentrated on rebuilding their inventories, the growth rated started to slow – a pattern that … [Read more...]

System Compatibility: An Essential Ingredient for Achieving Electromagnetic Compatibility and Power Quality for Lighting Control Systems

 

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...]

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