You Want Us to Test Where? or
Have Receiver, Will Travel or
This Week We Meet Up With Our
EMC Heroes Testing Somewhere in the Aegean Sea . . .
An EMC testing project can be a major
undertaking. For those visiting the EMC lab, the project can
involve days of collecting functional EUTs, gathering
support equipment, scheduling the necessary support personnel
and possibly arranging for shipment and travel. For those
operating the laboratory, preparing for test programs can
also be a major undertaking. The process can involve gathering
test equipment, preparing test fixtures, calibrating equipment,
scheduling personnel, etc. The whole process can, at times,
be a daunting undertaking. If an EMC test project ever becomes
overwhelming for you, let the following story remind you of
how good you have it.
In the early 1960s, NATO decided
to start a missile test range in the Aegean Sea. Genistron,
a Southern California EMC testing and filter manufacturing
company, was contracted to perform an RF survey of the area.
The NATO folks were rightfully concerned about supersonic
missiles heading in the wrong direction due to RF interference.
Genistron sent two survey teams to the Aegean: Team One to
the Greek island of Crete and Team Two to the Greek Islands
Santorini and Rodhos. Joe Fischer, now the CEO of Fischer
Custom Communications, was a member of Team Two that was sent
to Santorini and Rodhos. To reach the area of Santorini, where
the RF survey was to take place, Team Two had to pack their
sensitive test equipment 10 miles via mule train on a trail
that traversed the side of an ancient volcano. If you have
ever visited this island, or even if you have only seen pictures,
you understand that this was an Indiana Jones type adventure.
One piece of test equipment, along for the mule ride, was
a (new at the time) Polarad 1 to 10 GHz receiver. Evidently,
bad connectors often made this instrument somewhat unreliable
for the Genistron engineers. During the perilous trip, mule
and 1 to 10 GHz receiver suddenly parted company. After bouncing,
sliding and rolling 30 feet down a rocky slope, the runaway
receiver was retrieved and reloaded. According to Joe, the
Polarad performed better than ever after the accident! After
reaching the survey location, our heroes discovered that one
of their most reliable pieces of test equipment had been damaged
en route. The Stoddart MM10 had a broken control knob and
their mission could not be accomplished without the instrument.
Some have experienced the hassle of loosing an important test-set
during lab time, but the EMC adventurers from Genistron couldnt
use the cell phone and call Equipment Rents R Us.
One of the teams Greek guides hiked 20 miles to the
nearest radio phone and ordered a replacement to the MM10,
which had to be shipped from Los Angeles! Amazingly enough,
the replacement arrived on Santorini within 48 hours. After
overcoming the adversity on Santorini and also completing
the survey on the Island of Rodhos, Team Two returned to Los
Angeles after only 20 days. The next time you have to drive
across town or even 100 miles into the hills to do EMC testing,
be thankful that you dont have to travel by mule train
to get there.
|
Central New England
The Central New England EMC Chapter meeting
was held on Wednesday October 10th, 2001. The presentation described
the new US Suppliers Declaration of Conformity (SDoC) process
for certifying Telephone Terminal Equipment (TTE). The speaker was
Larry K. Stillings, President, Compliance Worldwide, Inc., of Sandown,
New Hampshire. Mr. Stilling shared that, on July 23, 2001, the Federal
Communications Commission (FCC) formally privatized the Part 68
process for TTE certification. A new organization called the Administrative
Council for Terminal Attachment (ACTA) now handles all TTE certification
procedures with the exception of waivers. Mr. Stillings also explained
the two new processes for how telephone terminal equipment may be
approved, either by the use of a Telecommunications Certification
Body (TCB) or through preparing an SDoC. The new labeling method
for ACTA, filing requirements, and standards in development to cover
new technologies were also discussed. 11 members and guests attended
and the speaker responded to active participation and questions
from the audience. Unfortunately, the meeting scheduled for November
1st had to be cancelled. The speaker was to have been Douglas C.
Smith, Independent Consultant and Distinguished Lecturer (DL) for
the EMC Society. We hope to reschedule this meeting in March, April
or May 2002. We will also schedule a meeting with DL Colin Brench
as the speaker around the same time in 2002. No other meetings are
scheduled from December 2001 through February 2002. The Chapter
avoids meetings in January because of possible winter storms in
New England, and because everyone is recovering from the Christmas
and New Year holidays.
Dallas
Bill Paschetag, Secretary/Treasurer of the
Dallas EMC Chapter, reports that 2001 was a very big year for the
Chapter. They were honored to have presentations by three EMC Society
Distinguished Lecturers, plus presentations by local EMC professionals.
They also had their second annual war story session and plan to
continue this at least once each year. The first monthly meeting
of 2001 was held at KTL in Lewisville, Texas, on January 16th. Pizza
and soft drinks were provided by KTL. The subject of the meeting
was a presentation by Tom Tidwell, Manager, Wireless Test Group,
KTL. Toms topic was EMC Issues in Low Power Wireless
Systems. Being in the heart of the Telecom corridor, there
was much interest in Toms presentation. There were 34 attendees
at the January meeting which included 17 IEEE members, 17 non-IEEE;
there were 11 new attendees. The second meeting of 2001 was held
at NTS in Plano, Texas, on February 26th. Pizza was provided by
Byrt Scammel, Airep Electronics, and soft drinks were provided by
Jim Abel, NTS. The subject of the meeting was a presentation by
Doug Smith of D.C.Smith Consultants. Dougs topic was Unusual
Forms of ESD. Doug demonstrated potential interference from
ESD produced by coins in a bag and from a standard office chair.
A digital storage oscilloscope to display the voltage waveform of
the ESD was provided by Harry Rosenberg of Agilent with pick-up
and delivery by Jim Abel and Bob Shoffstall of NTS. There were 32
attendees at the February meeting, 20 IEEE members,12 non-IEEE;
there were 5 new attendees. The third monthly meeting of 2001 was
held at NTS in Plano, Texas, on March 20th. A Tex-Mex buffet was
provided by Steve Kasachkoff of Chomerics, and soft drinks were
provided by Jim Abel, NTS. The subject of
the meeting was a presentation by Joe Butler, President of the IEEE
EMC Society and Marketing Manager of the Chomerics Division of Parker-Hannifin.
Joes topic was Why Dont We Have Shielding Effectiveness
Standards? There were 34 attendees at the March meeting, 16
IEEE members, 18 non-IEEE; there were 9 new attendees. The fourth
monthly meeting of 2001 was held at NEMKO - Dallas, in Lewisville,
Texas, on April 17th. A sandwich and fruit salad buffet and soft
drinks were provided by NEMKO - Dallas. The meeting started with
a welcome to NEMKO by Matt Fain, NEMKO Marketing Manager. The subject
of the meeting was a presentation by Werner Schaefer of Cisco Systems
in San Jose, California. Werners topic was Factors Determining
Test Speed of Automated EMI Measurements. There were 20 attendees
at the March meeting, 11 IEEE members, 9 non-IEEE; there were 2
new attendees. The fifth monthly meeting of 2001 was held at NTS
in Plano on May 15th. Pizza and soft drinks were provided by NTS.
The meeting started with a presentation to Jim Abel of NTS for an
outstanding contribution to the EMC Society for the past year. Gary
Shimko, Chairman of the Dallas Chapter of the IEEE/EMC Society,
provided the presentation. It was also announced that Dick Troup,
long-time Dallas area EMC professional, had passed away in his sleep
the previous Thursday (May 10) following a prolonged illness. The
subject of the May meeting was War Stories with Carl
Irby as the monitor. Steve Juett provided the first War Story on
the EMC challenges facing biomedical instrumentation in hospitals.
He presented very straightforward slides illustrating the situation.
The FDA has no immunity requirements for biomedical instrumentation.
[see photos]
Not surprisingly, the myriad of telemetry
links and proliferation of personal computing devices and cellphones
present challenges to medical equipment used to save lives, the
sensitivities of which can be in microvolts! Mark Bushnell shared
his war story of how his company sought to save money and time on
a lightning certification by performing analysis instead of testing.
After review by the certifying agency, the analysis was returned
after some time for a more detailed simulation. Finally, after the
agency approved the analysis, they required the test anyway. Neither
time nor funding for the test was saved. Even though tools may exist
to perform a simulation with high fidelity, sometimes the easiest
approach is just to execute the test. Finally, Steve Juett provided
another story from the biomedical arena tracing down the
source of an interference problem at the hospital to a local TV
station trying out its HDTV band. It took some effort to get in
touch with the right individual at the TV station to resolve the
problem! The Dallas Chapter takes a three-month summer break with
no meetings during June, July and August. Similar to an academic
schedule, the regular September meeting is the start of the 2001-2002
year. The sixth monthly meeting of 2001 was held at NTS in Plano
on September 18th. Pizza and soft drinks were provided by NTS. The
subject of the meeting was EMC Concerns For A Nuclear Power
Plant presented by Jim Press, Director of National EMC Operations,
National Technical Systems (NTS). There were 18 attendees at the
May meeting, 13 IEEE members, 5 non-IEEE; there was 1 new attendee.
The seventh monthly meeting of 2001 was held at Intertek Testing
Service (ITS) in Richardson, on October 16th. Pizza and soft drinks
were provided by ITS. The subject of the meeting was Current
Status of the R&TTE Directive presented by Bill Holz, Manager,
Global Approval Management Services, ITS. The attendees were given
a tour of the ITS facility. There were 23 attendees at the October
meeting, 13 IEEE members, 10 non-IEEE; there were 2 new attendees.
The eighth monthly meeting of 2001 was held at NEMKO Dallas (Lewisville),
on November 20th. Sandwiches, fruit, cookies and soft drinks were
provided by NEMKO. The subject of the meeting was Global Market
Access: Safety-EMC-Telecom Compliance presented by David Lohbeck,
General Manager for NEMKO Dallas. The attendees were given a tour
of the NEMKO facility. There were 25 attendees at the November meeting,
14 IEEE members, 11 non-IEEE; there were 9 new attendees. This years
annual Holiday Social was held at Bennigans Restaurant in
Plano, Texas. Eleven persons attended, six IEEE members and five
guests. Arrangements for the social were handled by Bob Shoffstall
and Bob Stevens of National Technical Systems in Plano.
France
The French chapter invited EMCS Distinguished
Lecturer Professor Sabrina Sarto, of the University of Rome, La
Sapienza, to speak at its meeting on December 17th, 2001.
Professor Sarto presented a lecture titled EM Performance
of Composite Materials and Metalized Plastics for Industrial Applications.
It was a very complete account of recent work on these topics, touching
such different subjects as coating technology, modeling of composite
panels, numerical issues in FDTD simulation etc., and illustrated
by a variety of examples. Following the presentation by Professor
Sarto, Dr. Ferdy Mayer presented Composite Magnetic Materials
and Anisotropy, where he pointed out promising directions
for further research on wideband absorbers.
Germany
The annual general meeting of the IEEE German
EMC Chapter took place November 21st in Frankfurt/Main. Chairman
Professor Heyno Garbe from the University of Hannover welcomed 18
Chapter members and safely guided them through the agenda. Besides
the more standard topics to be discussed, two points deserved special
attention: First, everybody was happy to hear about the 2001
Chapter of the Year Award that was given to the German EMC
Chapter at the 2001 International Symposium on EMC in Montreal.
Therefore, it was agreed to continue the many Chapter activities
and good work. Second, in regard to the application of the German
EMC Chapter to host the annual IEEE International Symposium on EMC
in 2006, it was reported that all necessary preparations and requirements
are met. It is planned to hold the Symposium in the historic city
of Dresden which will celebrate its 800th anniversary that year.
The final and, hopefully, positive decision of the Board of Directors
to approve the application is expected in the spring 2002. [see
photos]
Israel
On November 25, 2001, the chapter conducted
a special evening meeting with four presentations concerning Selected
Topics in EMC Engineering. The meeting was held in the headquarters
of the Association of Engineers and Architects in Israel (AEAI),
Tel Aviv. A total of 76 people attended the meeting, the majority
of whom are members of the AEAI and the IEEE EMC Chapter in Israel.
Chapter members and guest experts prepared all the lectures, which
were delivered during the three-hour meeting. The first two presentations
were associated with potential adverse effects induced by utility
lines EMI stray current and electromagnetic fields. The next
two presentations dealt with EMI effects generated from light trains
(electrical trams) that are used in urban mass transportation, and
design considerations of a static electricity grounding system.
The specific presentation titles were: Mutual Effects Between
Utility Lines and Underground Pipes Located within the Right-of-Way,
by Dr. Yavgeni Katz, Israel Electrical Company (IEC); EMC
and Safety Aspects of 400kV Electrical Power Lines, by Dr.
Yosef Peker-IEC and Moshe Netzer RAFAEL; Potential
EMI Effects of the Light Train in the Israel Metropolises,
by Mr. Oren Hartal and Moshe Netzer RAFAEL; and Design
Principals of ESD Grounding By What is it Different from
Safety Grounding? by Dr. Boris Veprik-RAFAEL. The entire event
was a great success as reported by all attendees.
Korea
Professor Dong Chul Park, the outgoing IEEE
EMC Korea Chapter Chairman, reports that the newly elected officers
took office on January 1, 2002. The new chairman and secretary are
as follows: Chairman: Professor Dong Il Kim, Department of Radio
Science and Engineering, Korea Maritime University (E-mail: dikim@kmaritime.ac.kr/
Phone: +82-51-410-4314), Secretary: Mr. Jong Hwa Kwon, Division
of Radio Technology, Electronics and Telecommunications Research
Institute (ETRI) (E-mail: hjkwon@etri.re.kr/
Phone: +82-42-860-6742).
Melbourne
The Melbourne Chapter held its December
meeting at the Indian River Brewing Company. The highlight of the
meeting was a lecture by Mr. Doug Smith, an Electromagnetic Compatibility
Society Distinguished Lecturer. Dougs talk was titled: Computer
Security for the Engineer, The Knock in the Middle of the
Night. Doug gave an entertaining lesson in personal computer
security, showing us how prevalent the problem of hacker intrusion
into home computers is and how we can protect ourselves from unauthorized
access. Dougs presentation, which included many examples taken
from his personal experience, left the audience with the unsettling
realization that security of our home computers is a serious concern
that requires us to take preventive measures. Prior to Dougs
lecture, the crowd enjoyed pizza and cold drinks while mingling
informally. The turnout for this meeting was very strong, with over
40 attendees. In addition to local EMCS members, we welcomed a large
group of students from the Florida Tech Student Chapter, and visitors
from the Canaveral, Daytona, and Orlando IEEE Sections. Participation
at our events has increased steadily as the local EMC community
and nearby IEEE groups have learned of our activities. Dennis Molly
and Kathy Reinhart, officers with the Melbourne and Canaveral sections
respectively, have been particularly helpful in spreading word of
our Melbourne EMC chapter activities. Of course, most important
to the success of our meetings is the availability of excellent
speakers such as Doug Smith through the IEEE EMC Society Distinguished
Lecturer Program. [see
photos]
Minneapolis-St. Paul
Curt Sponberg, Chair, reports that the Twin
Cities chapter last held an official meeting in June, to coincide
with the Board of Directors meeting in Minneapolis. In September,
the annual EMC event drew about 75 people, members and non-members,
for a one-day tabletop show and seminars. The local chapter will
not meet again until the latter part of 2002 due to the planning
of the 2002 IEEE Symposium on EMC in Minneapolis. Several chapter
members are part of the local committee. So, many of us are actually
meeting more than ever, at least until August!
Mohawk Valley
After a summer hiatus, the Mohawk Valley
Joint EMC/Reliability Chapter held two meetings in November and
December of 2001. Both meetings were conducted by Chapter Chair
Irina Kasperovich of ANDRO Computational Solutions in Rome, New
York. The November meeting featured EMC Society Distinguished Lecturer
Doug Smith of D.C. Smith Consultants in Los Gatos, California who
gave the talk: Computer Security for the Engineer, The Knock
in the Middle of the Night. In the talk, Doug covered some
of the undesirable things that can happen to ones personal
computer when surfing the Internet and how to avoid them. Screen
shots from an attack on Dougs computer were shown. He demonstrated
how the manufacturer of the laptop leaves it wide open to hackers
so it can diagnose laptop problems remotely. During a recent trip
made by Doug, that weakness was probed four times in two hours over
a dialup by hackers! Doug has also shown using a recording of the
electromagnetic emissions from his home computer as heard on a short-wave
radio, that different computer activities, such a surfing the Internet
and printing files, can definitely be identified audibly. This illustrates
the critical nature of computer security and the methods unscrupulous
individuals can use to directly or even remotely hack into a personal
computer. Weve all heard of the various methods of sniffing
and extracting electromagnetic signals from mobile communications
and computing devices. What is not always apparent is that this
can be done using simple radio receivers. Some recent cases of cyber-terrorism
have been observed where hackers use homemade sniffer probes and
consumer radios to measure output signals from personal digital
assistants (PDAs) and to decipher personal information. Doug provided
the audience with a great deal of food for thought which was well
received and appreciated. The December meeting featured Andy Drozd
of ANDRO Computational Solutions who presented the topic, Computational
Electromagnetics (CEM): A Blend of Science and Art? In his presentation,
Andy defined CEM as the blending of physics, computer science, mathematics,
and electromagnetics engineering to solve sophisticated problems
for simple-to-complex structures with associated electromagnetic
boundary conditions. The various factors that force one to ask whether
CEM modeling and simulation is both an art and a science were raised.
For example, what are the various methods that engineers use to
solve problems and how do they compare? What are the unique features
of CEM methods and codes? This talk attempted to answer these and
other questions using practical illustrations. The presentation
was based on a chapter on computer modeling for EMC contributed
by Andy for the textbook, Engineering Electromagnetic Compatibility:
Principles, Measurements, Technologies, and Computer Models,
2nd Edition by V. Prasad Kodali. The presentation overviewed CEM
methods focusing on several widely used techniques and their applicability
without rigorously delving into the theory. Although CEM codes have
their basis in Maxwells equations of one form or another,
their applicability and associated accuracies depend on the applied
physics, numerical solver approach (full or partial wave, non-matrix,
etc.), mathematical basis functions, canonical modeling primitives,
inherent modeling limitations, built-in approximations, desired
observables and so forth. Other factors such as analysis
frequency and time or mesh discretization further conspire
to affect accuracy, solution convergence, and overall validity of
computer models. Concerns immediately arise when the results of
predictions using one type of CEM code do not consistently agree
with the results of other codes or against measurement benchmarks,
begging the question, which is correct? Andys
familiarity with this topic is due to his work in the areas of CEM
engineering research and development, multi-spectral information
fusion, visualization, and collaborative engineering. He has over
26 years of experience in electrical and electromagnetic engineering,
and more recently, in applying AI/expert system technologies to
electromagnetic environment effects (E3) computer modeling and simulation.
He is currently leading the development of a new IEEE standard and
recommended practice for validating CEM computer models. Andy plans
to give an encore presentation at the spring 2002 Mohawk Valley
EMC/Reliability Chapter meeting and for the Winter meeting of the
Rome Academy of Sciences. The Chapter plans to invite at least two
more Distinguished Lecturer Program speakers for the 2002 spring
and fall meetings.
Nanjing
Wen Xun Zhang, Chapter Chair, reports that
the Nanjing Chapter met on November 19th and November 26, 2001.
The November 19th meeting was held to discuss chapter business.
The meeting was attended by 9 IEEE members and 11 guests. During
the meeting on November 26, two technical presentations were given.
The first speaker was Da-Gang Fang of Nanjing University of Science
and Technology who presented a paper entitled, Optimized Design
of Macrostrip Patch Array. The second speaker was Ru-Shan
Chen of Nanjing University of Science and Technology who presented
a paper entitled, Vector FEM Techniques for 3-D Full Wave
EM Problems. The technical presentations were well attended
by 15 members and 44 guests.
Orange County
The Orange County Chapter met on October
24th at CKC Laboratories in Brea, California. Robert Tozier of CKC
Laboratories has taken over the Chapter Chair position from Randy
Flinders who will continue as Vice Chair. The Orange County Chapter
welcomed Brett Robinson of Robinsons Enterprises, a Consulting
and Engineering firm based in Chino, California. Mr. Robinson discussed
the pros and cons of using COTS (circuit cards off the shelf) in
customer driven designs, both commercial and military.
For example, a manufacture elects to use an off the shelf video
card with their FTN or TFT display. The initial assessment is, great,
it matches; very little design modifications are necessary, and
the combination utilizes the latest technologies. However,
the problem is that the entire system was not designed to meet the
latest applicable EMC requirements (RTCA-DO160D, Mil-Std-461/462D,
Mil-Std-810E/F, CISPR 22, FCC Class B, etc). The solution to these
problems was discussed and included back plane design techniques,
enclosure design, lightning protections via transorb utilization,
custom designed compatible boards, shielding of cards, etc. We had
a good turn-out of about 22 attendees. We expect to continue having
the meetings at the new location of CKC Laboratories in Brea. [see
photos]
Phoenix
Harry Gaul reports that the speaker at the
October 4th, 2001 meeting was Garth DAbreu of ETS-Lindgren
in Austin, Texas. The topic of Garths talk was Reverberation
Chambers: Design, Testing and Control, A Simplified Approach
which provided a good introduction to our Phoenix Chapter on the
many uses of reverberation chambers. In this talk, we learned how
reverberation chambers could be used to perform quick radiated emissions
measurements. These chambers are often used for accurately measuring
the shielding effectiveness of cables, gaskets, and conductive fabrics.
One of the most exciting uses of these chambers is to perform radiated
susceptibility testing that is very repeatable, even after disturbing
the cable and EUT placement in a chamber. Garth explained that aluminum
could be used for construction of reverberation chambers in order
to minimize losses. But this comes at the expense of having resonant
nodes at low frequency that are fairly narrow in bandwidth. This
effect can easily be corrected by adding some portable absorbers
to de-Q the room, but of course at the expense of higher
losses. His talk was concluded with a demonstration of software
that can be used for calibration and operation of reverberation
chambers. Check out the Phoenix web site at https://www.ewh.ieee.org/r6/phoenix/phoenixemc/
for the latest schedule on upcoming meetings. [see
photos]
Rocky Mountain
The Rocky Mountain Chapter of the IEEE EMC
Society held its 11th annual Regional EMC Symposium on Wednesday,
October 3rd, 2001 at the Radisson Inn Greystone Castle in North
Denver, Colorado. The annual symposium has been a key element of
our Chapter program, which has focused on providing the regional
technical community with valuable EMC training and education. Attendance
at the event was relatively good, considering the date was in the
shadow of the September 11 tragedy. A total of 123 members and guests
participated in the symposium. The event included 20 exhibitors;
with exhibits set up in the area where breakfast, breaks and lunch
was provided for all attendees.
The technical program was expanded this
year to include three parallel tracks to provide for a broad range
of interests. The program included: Full day Tutorial on Fundamentals
of EMC by Dr. Clayton Paul; Workshop sessions exploring selected
topics presented by experts in the EMC field, including Dr. Eric
Bogatin, T.J. Ritenour, Dr. Karl Bois and Dr. David Quint, Dr. Scott
Bennett, and Doug Smith; Technical papers on current EMC topics
by regional and national authors including: O. Buhler, C. Marrero,
Dr. R. Johnk, Dr. Novotny, C. Weil, M. Taylor, T. OHara, H.
Holden, Dr. E. Bogatin, R. Georgerian, R. Duffy, R. Perala, M. VanDenBergh,
G. Senko, T. Robinson and S. Monroe.
The officers of the Rocky Mountain Chapter
of the EMC Society wish to thank all who contributed to the success
of this event. Special thanks to RMC Chapter members Charles Grasso
and Tony OHara for work in coordinating the technical program
and exhibitor arrangements. The complete symposium program, including
ex-hibitors and technical program with presentation downloads, is
available at https://www.ieee.org/rmcemc/.
[see photos]
San Diego
The San Diego Chapter finished a very successful
year in 2001 with a pair of well-attended meetings featuring interesting
topics and excellent speakers. November brought a great meeting
with both EMC and safety offerings. This exciting, double-header
featured Don Heirman of Don HEIRMAN Consultants and Dan Hoolihan
of Hoolihan EMC Consulting presenting their informative EMC
Measurement UncertaintyWhat is Certain and What is Not?
Coupled with Deborah Madsen of Underwriters Laboratories educating
us on the subject of Protection Against Electric Shock: UL
2601-1/IEC 60601-1 Insulation Diagrams, it made for a very
full evening. The San Diego Chapter would like to thank the members
of the EMCS Board of Directors that joined us for the meeting. They
were in town for their last Board meeting of the year. It was a
pleasure hosting them and we look forward to seeing them again soon.
The San Diego chapter finished the year with a helpful and entertaining
presentation from Dr. Brett D. Robinson of Robinsons Enterprises
on the subject of EMC Design and Test Considerations for Wireless
Communication Products. This is a topic well suited to the
San Diego area due to a local concentration of cell-phone and wireless
communication companies. The San Diego Chapter looks forward to
an even-better year in 2002 and they wish the same for the other
EMCS chapters around the country and the world! [see
photos]
Seattle
The Seattle Chapter held a four-hour workshop,
from 4:00 to 8:00 pm, in October at CKC Labs in Redmond. Chris Kendall
of CKC Labs spoke at the Design for Test and Immunity Workshop.
The workshop was attended by a sell out crowd of 40
people (attendance was limited so the instruction could be interactive).
All students received a certificate of completion signed by the
instructor and the chapter provided dinner at the half way point
of the workshop. The immunity part of the workshop covered such
topics as grounding, bonding and shielding for immunity, design
techniques for achieving required immunity, including system grounding,
I/O cable shielding and shield termination, I/O filtering, PC board
layout rules, PCB filtering rules, case shielding requirements,
clamping methods, and RF common mode chokes. In addition, immunity
analysis transient and steady state, including the frequency
domain transform of typical waveforms, radiated emissions levels
and amount of cable voltage coupling was addressed. Test Methods
for Immunity covered such topics related to EN61000-4-2 (IEC
1000-4-2, et al) such as ESD theory how ESD is generated
and basic physics that describe ESD including capacitance, impedance,
charge, voltage, current, and power, radiated immunity, electrical
fast transient burst and conducted immunity. Mr. Kendall concluded
his presentation with a review of some product specific variations
of test methods, including EN55024, Information Technology Equipment,
EN55103-2, Professional Audio and Video Equipment, EN61326, Test,
Measurement and Instrumentation Equipment, IEC60601-1-2, Medical
Devices, EN50130-4, Security Systems and ETS 300 683, Intentional
Radiators. This October workshop was FREE to all who attended. Its
part of the extended presentation format scheduled by the Seattle
Chapter each fall. In November, the chapter was treated to an incredible
graphics display with the lively presentation by Franz Gisin of
Sanmina in San Jose. The psychadelic graphics reminded many of those
in the audience of lava lamps from the 1960s. The title
of the presentation was How to Div Grad Kink and Curl Electrons
Into Generating Unwanted Radiated Emis- sions. In fact, the
presentation was so good that it was later formatted into an article
and it appears in this Newsletter on page 25. Check it out for all
the details of the material presented. The meeting was held at AT&T
Wireless in Redmond. The excellent barbecue dinner before the meeting
was provided courtesy of Techmaster Electronics. Over 40 chapter
members and guests attended this presentation and many stayed well
after the meeting to ask questions. [see
photos]
Singapore
There was a good turn out for the November
meeting that the Singapore EMC Chapter held jointly with the Institute
of High Performance Computing (IHPC, Singapore) who happened to
be holding a seminar on Electromagnetic Compatibility Simulation
and Design. In all there was 30 attendees. Three presentations
were featured during the meeting. The speakers were Dr. Chunfei
Ye and Dr. Da-Ming Zhang of IHPC and Mr. Wee-Sing Chow of CET Technologies.
The presentations covered various aspects of EMC simulation. Dr.
Ye gave some useful insight into the role of various techniques
and methods used in computational electromagnetics (CEM), such as
the use of the Method of Moments or what was otherwise known as
the Boundary Element Method in the frequency domain. With regards
to simulations in the time domain, Dr. Ye explained the role of
Finite Difference Time Domain and Finite Element Models with various
Absorbing Boundary Conditions to free space with a finite computational
volume. There was a brief introduction of the use of a Perfectly
Matched Layer, Hidgons operators and a few others. Several
illustrations were presented by Dr. Ye dealing with the computation
of the capacitance matrix for a wire bonded die in an IC package,
radiated emission from PCB nets and several other applications of
simulation. Dr. Ye spoke about the results from the use of simulation
and presented many illustrations on field distributions in a computer
chassis with many apertures as well as arrow charts on the power
density functions in the microscopic scale for a via-hole in a printed
circuit board. Mr. Chows presentation was entitled System
EMC Engineering and it was targeted at the application of
CEM for large-scale system integration projects. The Naval Ship
program and the Mass Rapid Transit (MRT) were cited as the examples
of EMI/RFI modeling and simulation. The simulations were aimed to
get a better understanding of the electromagnetic environment and
the likely EMI phenomena for a given platform. The results provided
the necessary quantitative risk assessment for possible EMI situations
at system and equipment levels. Mr. Chow also spoke on the EMC management
process throughout the entire project life cycle, in particular
EMC requirements in areas of general equipment layout, earthing
design, bonding implementation, cabling design and layout. This
presentation introduced some installation guidelines and mitigation.
Mr. Chow concluded his presentation with a theme based on the importance
of EMC awareness and responsibilities among the different groups
in an organization such as Purchasing, Assembly/Production, Installation
and Maintenance, besides the leading design and test group in a
typical project team structure. Dr. Zhang gave a presentation on
the Experimental Design and Analytical Modeling of a Reverberation
Chamber. The meeting was held at IHPC in the afternoon and IHPC
had generously provided the attendees with refreshments during the
break between presentations. The event was a unique opportunity
for chapter members to mix with members of the industry, and many
of them took time off from their busy schedules to attend. [see
photos]
Southeastern Michigan Chapter
The Southeastern Michigan Chapter hosted
an EMC Measurement Uncertainty Workshop on October 1 and 2, 2001.
The workshop instructors were Ed Bronaugh, Don Heirman and Dan Hoolihan.
The workshop covered uncertainty basics, distribution functions,
calculations and associated guides and standards. Attendees were
given software to calculate uncertainties of actual instrumentation
from their test laboratories. The workshop was attended by 39 participants
and was coordinated by Scott Lytle at the Yazaki North America facility
in Canton, Michigan. A tour of the new Yazaki EMC Test Laboratory
followed the workshop. The Southeastern Michigan Chapter is now
planning their third annual EMC Fest to be held on April 22, 2002.
Details can be found on the chapter website at https://www.emcsociety.org.
[see photos]
Toronto
Ramesh Abhari, Chair of the IEEE Toronto
Electromagnetics and Radiation (MTT-S/AP-S/EMC-S) joint chapter,
reports that they enjoyed a meeting and technical presentation on
October 26, 2001. The lecture, given by Dr. Amir Mortazawi, was
entitled: Quasi-Optical and Extended Resonance Power Combining
Structures. Dr. Mortazawi is an Associate Professor in the
Department of Electrical Engineering and Computer Science at the
University of Michigan in Ann Arbor, Michigan. The well-attended
meeting was held in the Medical Sciences Building at the University
of Toronto.
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