INTRODUCTION Digitization and the spread of pervasive computing is at the forefront of the technology innovation that will shape our modern universe and it is already manifesting itself in IoT, 5G and autonomous vehicle spaces, to name just a few areas. As this spread of technology increases, so does the need to regulate it – in terms of how these devices and systems … [Read more...]
Determining Semi-Anechoic Chamber Resonance as a Source of Radiated Emission Measurement Variation Between Chambers and Comparing to OATS Measurements
INTRODUCTION This article describes the lack of an acceptable correlation between anechoic chamber and open field test site radiated emission measurements, which were described in reference 1 in 2000, as well as a lack of correlation between chambers. It was found that emission measurements, which were over the limits in one facility, would pass in another. The lack of a … [Read more...]
EMC Radiated Emission Measurements at 1/3/5/10/30 Meters
INTRODUCTION There are two principal types of emission measurements in the world of electromagnetic compatibility, conducted emission and radiated emission. The conducted emission measurements are either a voltage-capacitive tap type of measurement (typically on a power line) or they are a current-clamp type of measurement (typically on a signal line). Radiated emission … [Read more...]
Resilience is Key to the Connected and Autonomous Revolution
INTRODUCTION Connected and autonomous vehicles have long been hailed as the answer to safe transport. Around 1.25 million people die in road traffic accidents worldwide each year according to E&T– and driver error accounts for over 90 per cent of those deaths[1]. In theory, the removal of the driver as the lead decision maker for vehicle control should reduce this number, … [Read more...]
FCC’s New Equipment Authorization Rules – First Report and Order FCC 17-93
The FCC announced New Equipment Authorization Rules in the First Report and Order FCC 17-93 on July 13, 2017, and followed this on July 20 with a live webcast of a panel discussion featuring the FCC OET and lab division Chiefs providing details of the changes and answering manufacturer questions. Highlights of the First Report and Order This report and order streamlines … [Read more...]
Book Review: Foundations of Electromagnetic Compatibility (Adamczyk)
OK, this is not a book for the faint-hearted. Bogdan Adamczyk is a professor of engineering and the founder of the EMC Center at Grand Valley State University in Grand Rapids, MI. As such his recent book, Foundations of Electromagnetic Compatibility with Practical Applications (Wiley 2017, ISBN 978-1-119-12078-0) is crammed with derivations of basic electromagnetic … [Read more...]
Troubleshooting Radiated Immunity for Medical Products – Case Study
Introduction Companies making medical products have much more stringent requirements now that the new IEC 60601-1-2 (Edition 4) became effective June 17, 2017. One of the many changes included increased radiated immunity requirements in several specific wireless and communications bands (Table 1). Highlights of all the changes are included in Interference Technology’s free … [Read more...]
An Engineering Ethics Question for Today
I’ve been presenting a seminar on engineering ethics to students in the Electrical Engineering Department at Washington State University for a number of years. I’ve started off with a video of the Challenger explosion and the questions leading up to it as expressed by Roger Boisjoly, a Morton Thiokol engineer. Roger Boisjoly had studied data showing that the field joint … [Read more...]
Joining the New Defense Acquisition University (DAU) Spectrum & EM Compliance Community of Practice (CoP)
The Defense Spectrum Office has sponsored for many years, the Spectrum and EM Compliance Special Interest Area on the DAU’s Acquisition Community Connection (ACC) portal. This Community of Practice (CoP) serves as a platform to connect Spectrum and E3 Compliance practitioners from across multiple career fields, offering them a chance to talk, share, and acquire knowledge about … [Read more...]
Selecting the Proper EMI Filter Circuit For Military and Defense Applications
Introduction Insertion loss, the term used to express a filter’s ability to reduce or attenuate unwanted signals, has traditionally been measured in a 50 ohm source and 50 ohm load impedance condition, as standardized in MIL-STD-220. In this matched 50 ohm impedance condition, various types of filter circuit configurations, single capacitor, “L’s”, “PI’s”, and “T’s”, will … [Read more...]
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