The EMC Experiments and Computer Modeling and Simulation Demonstrations
have become a labor of love for me over the past decade. I enjoy
the opportunity to look back on what we have accomplished over
the years and more recently, reflect on the significant contributions
made this year at the Boston EMC Symposium. The EMC Society Education
and Student Activities Committee traditionally sponsors these
demonstrations as part of the annual IEEE EMC symposia. Lets
take a quick tour of this years demonstrations and outline
our plans for next August in Santa Clara.
To begin, this year we scaled down our agenda by scheduling a
fewer number of demonstrations. One of the comments we received
from attendees in the past was that because of the parallel and
often competing nature of the paper sessions and other symposium
activities, it was difficult to catch many of the demonstrations
that would be of particular interest. To alleviate the conflict
somewhat, a fewer number of demonstrations were arranged, leaving
room for encore presentations on different days; in
effect, allowing those who gave papers or who were otherwise engaged
in the paper sessions to attend the demonstrations at their convenience.
This year we had a total of 20 demonstrations given by an international
cast of presenters over a 2-day period. Each presenter did an
outstanding job of giving original and challenging demonstrations
on a number of important EMC topics. These were aimed at raising
the awareness of engineers to effective EMI troubleshooting methods,
the importance of implementing good EMC design and measurement
practices, and providing insights into basic electromagnetic phenomena
and effects via practical examples of real world problems.
|Christian Bruns from the Swiss Federal
Institute of Technology, Professor Jim Whalen from the State
University of New York at Buffalo, and Meir Haim from Motorola
Israel (from left) pause to take in the experiment being performed
by Professor Whalen.
For newcomers to this, the original concept of the demonstrations
was that of a series of live hardware experiments
centered on methods of trouble shooting various types
of EMI problems. This has been extended in recent years to include
demonstrations of computer modeling and analysis methodsor
virtual trouble shootingof hardware problems.
In either case, electromagnetic phenomena are observed in real
time, but cautionsometimes things work out great and sometimes
they dont turn out as expected. Thats where the real
trouble shooting begins. Things can get quite interesting to be
The idea for the demonstrations began in the early 1990s. This
led to the EMC Experiments and Demonstrations Manual, Volume 1,
a compendium of experiments covering fundamental EMC concepts
and phenomena that is published by the EMC Society Education and
Student Activities Committee. This manual has become a popular
resource for educators and EMC practitioners alike. The manual
was originally compiled and reviewed by Clayton Paul and Henry
Ott for the EMC Society Education Committee. In 1993, a first
attempt to demonstrate selected experiments from this manual in
an open, interactive forum in conjunction with the EMC symposium
grew into what we know today. A Volume 2 manual has also been
compiled. Both volumes can be downloaded from the IEEE EMC Society
Web Site at www.emcs.org.
|Rohde & Schwarz provided equipment
for the experimental demonstrations during the Boston Symposium
and also staffed a large exhibition with (from left) Vic Hudson,
Kerby Gove, Hans-Peter Bauer, and Achim Gerstner.
The demonstrations are often designed to demystify EMI/EMC by
giving new, practical meaning to EMI troubleshooting and EMC conformance.
We continually strive to emphasize practicality as well as stress
the educational benefits of the demonstrations. This years
agenda of hardware-oriented experiment demonstrations in Boston
Comparison of PEAK, AVERAGE
and QUASI-PEAK Measurements by Mark DeBattista of Harley-Davidson
Motor Company of Milwaukee, Wisconsin, USA.
Measurement and Simulation of the Electromagnetic Emission
of a 16-bit Micro-Controller by Christophe Lochot and Sébastien
Calvet of Motorola SPS in Toulouse Cedex, France, and Stéphane
Baffreau and Etienne Sicard of INSA-DGEI in Toulouse Cedex, France.
EMC of UWB Emissions by Arthur H. Light of SYColeman Corporation
in Fairfax, Virginia, USA.
Measured and Calculated Resonant Frequency of a Shielded Enclosure
by Randal Vaughn of Silent Solutions, LLC in Amherst, New Hampshire,
Experiment on Demonstration of the Principle of the Path of Least
Inductance by Elya B. Joffe of KTM Project Engineering, Ltd.,
KFAR Sava, Israel.
Analyzing Current Paths and Magnetic Field Effects by Roy
C. Ediss of Philips Semiconductors, Southampton, UK.
Troubleshooting Noise in a Chip Package by Doug Smith of
Los Gatos, California, USA.
Product Safety Tests - A Demonstration by Bill Bisenius
of Educated Design & Development, Inc.
Mitigating the Effects of ESD on a Timing Circuit by Ahmad
Fallah of Sauer Danfoss in Minneapolis, Minnesota, USA.
How Parasitic Effects in Inductors and Capacitors Affect Electrical
Equipment by James J. Whalen of the Department of Electrical
Engineering, State University of New York at Buffalo, Buffalo,
New York, USA.
ESD Waveform Analysis by Ken Wyatt of Agilent Technologies,
Colorado Springs, Colorado, USA.
I found this years experiment demonstrations quite interesting
and learned a few new things about EMI/EMC that I had not given
much thought to previously. For instance, one of the ESD experiments
nicely compared human body electrical discharges with various
ESD simulators, including piezoelectric generators, a Ziplock®
bag of coins, and a Doug Smith passive spark
gap. This emphasized the different ways one can measure
and view the effects of electrical discharges from the human body.
While I have been aware of the human bodys potential to
produce ESD events, I gained a much better insight
into and appreciation of the mechanisms that can make the human
body a potentially lethal source of EMI to circuits
and devices. Humans have potential, in more ways than one! Another
experiment demonstrated how to trouble shoot EMI in devices using
a novel, yet simple probe device and how noise can be controlled
at the source by implementing common sense EMC design
|Bob Dockey of Philips Medical (left)
ably handled the experimental demonstration logistics as a
member of the Boston Symposium Steering Committee. He managed
to find a little free time during the symposium, however,
to catch up with industry colleagues, such as Kefeng Liu of
|ANDRO Computational Solutions lends
tremendous support to the experimental demonstrations each
year. Irina Kasperovich (left) and Sharon Hall were on hand
at the Boston Symposium to conduct an experiment while Andy
Drozd (smiling center) is the member of the Education and
Student Activities Committee responsible for coordinating
the EMCS Symposia experimental demonstrations.
I must say though that I was very impressed by this years
winners of the prestigious Student Design Competition who demonstrated
the results of a project to develop the best solution to a standardized
broadband EMI problem using a standard design kit. The winners
were Antony Mihalopoulos, Jon Kobleske, and Wayne Stollenwerk
of the University of Wisconsin-Milwaukee. The Education and Student
Activities Committee also sponsors this competition. They used
a standard kit containing the required components for the broadband
EMI circuit, which involved the design, construction, evaluation,
and documentation of the EMI mitigation techniques for a prescribed
electronic circuit. The experimental evaluation involved testing
the completed circuit by measuring the radiated and/or conducted
emissions using simple laboratory techniques and equipment. They
did a great job demonstrating their experiment and presenting
their findings. Needless to say, the future of EMI/EMC engineering
is in good hands!
|Art Light of SYColeman Corporation
(left) enthusiastically performs the demonstration entitled
EMC of UWB Emissions.
|Doug Smith of DC Smith Consultants
(seated) enjoyed sharing some of his trouble-shooting tips
during the Boston Symposium to an attentive audience.
Changing course, the computer software demonstrations that were
held in parallel with the hardware experiments illustrated the
application of practical EMC modeling approaches and simulation
techniques to simple canonical problems. The application of discrete
analytical models as well as rigorous numerical techniques were
demonstrated. These techniques included the moment method (MoM),
uniform theory of diffraction (UTD), finite difference time-domain
(FDTD), finite element modeling (FEM), transmission line methods
(TLM), and others. The emphasis was not on the computer tools,
but on the efficacy of analytical, computer-based problem solving
methods for selected problems using a general-purpose code. The
demonstrations further showed how computer analysis can be an
effective means of identifying and mitigating EMI problems, and
complementing EMC design and measurement tasks.
This years agenda of computer modeling and simulation demonstrations
Solution of EMC Radiation, Shielding, and Cable Coupling
Problems by an Enhanced Method of Moments by Ulrich Jakobus
of EM Software & Systems GmbH of Böblingen, Germany.
The EMC Expert System at Work - Identifying Sources of EMI
on PCBs by Markus Buecker of Zuken, EMC Technology Center,
Using FDTD for Real-World EMC Simulation by Bruce Archambeault
of IBM, Research Triangle Park, North Carolina USA.
Spreadsheet Illustrations of Power-Distribution Components
by Istvan Novak of Sun Microsystems in Burlington, Massachusetts,
System-Level EMC Antenna Coupling Analysis for Large, Complex
Structure Topologies Using a Progressive Modeling and Simulation
Approach by Irina P. Kasperovich and Sharon C. Hall of ANDRO
Computational Solutions, LLC in Rome, New York, USA.
How to Accurately Simulate High-Speed Frequency Dependent Losses
in Transmission Line Systems by Brian Burke of Interactive
Products Corporation, Cary, North Carolina, USA.
EMC Simulation in the Electronics Design Process by David
P Johns of Flomerics Inc., Southborough, Massachusetts, USA.
CEM Code Validation Using Thermal Imaging Techniques
by John Norgard of the University of Colorado and the US Air
Force Academy in Colorado Springs, Colorado, USA.
System-Level EMC Modeling and Coupling Analysis of Co-located
Antennas, Cables and Equipment by Irina P. Kasperovich and
Sharon C. Hall of ANDRO Computational Solutions, LLC in Rome,
New York, USA.
|EMC Simulation in the Electronics
Design Process was presented by David P. Johns of Flomerics
(left). Jeff Evans of Hewlett Packard (foreground right) found
the demonstration most interesting.
|Randal Vaughan of Silent Solutions
conducted an experimental demonstration showing the measured
and calculated resonant frequency of a shielded enclosure.
These demonstrations covered the gamut from PC boards to enclosures
to large, complex system applications. Most notable were the new
methods for analyzing complex EMI/EMC problems using enhancements
to the traditional MoM techniques, applications of expert system
techniques to identify and rank the sources of EMI as part of
the mitigation procedure, use of fast iterative solvers, and novel
applications of the TLM and FDTD methods in the design of electronic
Murphys law and our EMC constant states that
anything that can go wrong in EMC usually will. Indeed,
we ran into several problems during the course of the two days
when the equipment or software did not work quite as expected.
This led to a few collaborative working sessions which gave bystanders
another educational opportunitythat of seeing how the experts
solve problems on the spotproviding some important lessons
in the process.
|Mark DeBattista of Harley-Davidson
Motor Company (far left) regularly draws a crowd at his experimental
demonstration. This year was no exception!
|Roy Ediss of Philips Semiconductors
is shown conducting his demonstration entitled, Analyzing
Current Paths and Magnetic Field Effects.
Our thanks go out to each of the presenters for contributing to
the overall success of the demonstrations. We are also indebted
to the volunteers who helped coordinate these demonstrations,
in particular, Bob Dockey of Philips Medical Systems in Andover,
Massachusetts, who did an outstanding job taking charge of the
logistical planning, arranging for the test equipment, and setting
up the demonstration stations in the Main Exhibit Hall of the
Hynes Convention Center. We are also indebted once again to our
equipment suppliers, which included Tektronix, Rohde & Schwarz,
Advantest, Agilent/Hewlett-Packard, KeyTek, and Schaffner for
providing the oscilloscopes, spectrum and network analyzers, EMI
receivers, signal and function generators, meters and probes,
and other hardware for the demonstrations.
We are now making plans for the demonstrations at the 2004 IEEE
International Symposium on EMC in Santa Clara, California from
August 9 through 13. A Call for Experiments and Demonstrations
for next years events will be available on the Santa Clara
web site. If you have ideas for a demonstration and want to have
it considered, please visit the EMC Society home page at www.emcs.org
or the 2004 EMC Symposium web site at www.emc2004.org.
We are particularly interested in hardware experiments that may
have a computer modeling and simulation and/or technical paper
counterpart. We may continue the plan of having a fewer number
of demonstrations with rotation over the main two-day period.
This is still on the drawing board. In the meantime, please contact
me if you have any questions or ideas at email@example.com.