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Interference Technology

For EMI / EMC Engineers

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Troubleshooting EFT

 

EFT Phenomenon Recently I tested a medical device for EFT susceptibility. The requirement is that the medical device must be immune to EFT bursts generated per IEC 61000-4-4. Per this standard EFT bursts are applied in four steps. For level 4, steps 1 and 2 are +/-2kV at 5kHz, and steps 3 and 4 are +/-2kV at 100kHz. For each step, these bursts are applied at 300ms interval for … [Read more...]

Assembling A Low Cost EMI Troubleshooting Kit – Part 2 (Immunity)

 

This article concludes the two-part series, Assembling Your Own EMI Troubleshooting Kit – Part 1, which included a listing of the major components of a complete EMI trouble shooting kit that can be easily transported where needed. Most of the probes and tools listed in Part 1 were useful for troubleshooting radiated emissions. In Part 2, we’ll discuss several other useful … [Read more...]

New One-of-A-Kind Contact Current Meter (CCM)

 

The ICNIRP 1998 and 2010 guidelines for limiting exposure to time‐varying electric and magnetic fields (1HZ – 100 kHz) and specifically about their reference levels for time-varying contact currents from conductive objects brought to the EMF Directive 2013/35/EU, mandatorily in force from July, 1st  2016 in the EU. One of the parameters to be measured in accordance with this … [Read more...]

Finger Stock EMI Shielding Gaskets Offered with Interactive Sales Drawings

 

EMI shielding BeCu finger stock gaskets from Tech-Etch are offered in over 100 standard profiles. Downloadable interactive sales drawings allow the user to modify the strips to their exact requirements. Beryllium copper's mechanical and electrical properties make it the ideal material for EMI/RFI shielding, with over 100db attenuation. BeCu offers maximum spring properties for … [Read more...]

New Edition of “EMC for Product Designers” Available Now

 

Now in its 5th edition, this text shows how to incorporate EMC principles in product design, avoiding cost and performance penalties to meet the needs of specific EMC compliance standards. A specific addition covers issues around functional safety. The book aims to present a complete introduction to EMC for product design,written by a practising consultant in the field. It … [Read more...]

Gaps In Return Planes – Bad News for EMI

 

Currently, there is an ongoing discussion among SI and EMC engineers on the fine points of PC board design for best signal integrity and EMI performance. Among the topics it seems designing in gaps or slits in ground return planes always comes up. Gaps can also occur mistakenly due to the addition of some connectors or other object that creates gaps in the copper. In fact, … [Read more...]

Robust Capacitors Suitable for EMI Suppression in Input Filters

 

TDK Corporation has a new series of robust EPCOS MKP X2 capacitors for EMI suppression. Compared with conventional X2 capacitors designed for rated voltages of 305V AC, these new components offer a higher rated voltage of 350VAC. This makes them suitable for EMI suppression in input filters – specifically for applications on the North American market – and output filters of … [Read more...]

T-Filters, Transmission Lines and EMC

 

Have you ever had a signal integrity issue that did not have its toll on EMC? If you did then you should consider yourself lucky to have avoided this nightmare. I. Situation: An I2S bus master clock driver is set to 12.288MHz and run at 3.3V. Drive strength is at 50-Ohms. Rise time is at 2ns. Fall time is at 2ns. The driver is located on the “master board” and the bus … [Read more...]

Radio Equipment Directive

 

This article provides an update on changes occurring as a result of the new Radio Equipment Directive (RED) 2014/53/EU which can be used from June of 2016. It looks at the changes in the product and regulatory landscape and what it means to equipment manufacturers. More detail on the history of the RED can be found in the article, Radio Equipment Directive, in the … [Read more...]

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