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Grounding & Shielding for EMC
Summary
Grounding and shielding are two of the most
effective techniques for combating EMI.
This three-day course is designed for engineers,
technicians, and operators, who need an
understanding of all facets of grounding and shielding
at the circuit, PCB, box, equipment and/or system
levels. The course offers a discussion of the trade-offs
for EMI control through grounding and shielding at all
levels. Hardware demonstrations of the effect of
various compromises and resulting grounding and
shielding effectiveness are provided. The
compromises that are demonstrated include aperture
and seam leakage, and conductor penetrating the
enclosure. The hardware demonstrations also include
incorporating various "fixes" and illustrating their
impact. Each attendee will receive a copy of Bill Duff’s
new text, Designing Electronic Circuits for EMC.
Instructor
Dr. William G. Duff (Bill) received a BEE degree
from George Washington University, a
MSEE degree from Syracuse University,
and a DScEE degree from Clayton
University.
He is internationally recognized as a
leader in the development of engineering
technology for achieving EMC in
communication and electronic systems. He has more
than 40 years of experience in EMI/EMC analysis,
design, test and problem solving for a wide variety of
communication and electronic systems. He has
extensive experience in applying EMI mitigation
techniques to "fix" EMI problems at the circuit,
equipment and system levels.
Bill is a past president of the IEEE EMC Society and
a past Director of IEEE Division IV, Electromagnetics
and Radiation. He served a number of terms on the
EMC Society Board of Directors. Bill has received a
number of IEEE awards including the Lawrence G.
Cumming Award for Outstanding Service, the Richard
R. Stoddard Award for Outstanding Performance and a
"Best Paper" award. He was elected to the grade of
IEEE Fellow in 1981 and to the EMC Hall of Fame in
2010. Bill has written more than 40 technical papers
and 5 books on EMC. He also regularly teaches
seminar courses on EMC. He is a NARTE Certified
EMC Engineer.
What You Will Learn
• Examples Of Potential EMI Threats.
• Safety Grounding Versus EMI Control.
• Common Ground Impedance Coupling.
• Field Coupling Into or out of Ground Loops.
• Coupling Relationships.
• EMI Coupling Reduction Methods.
• Victim Sensitivites.
• Shielding Theory.
• Electric vs Magnetic Field Shielding.
• Shielding Compromises.
• Trade-offs Between Shielding, Cost, Size,
Weight,etc.
January 31 - February 2, 2012
Columbia, Maryland
May 1-3, 2012
Columbia, Maryland
$1795 (8:30am - 4:00pm)
"Register 3 or More & Receive $100 00 each
Off The Course Tuition."
Course Outline
1. Introduction. A Discussion Of EMI Scenarios,
Definition Of Terms, Time To Frequency Conversion,
Narrowband-Vs-Broadband, System Sensitivities.
2. Potential EMI Threats (Ambient). An Overview
Of Typical EMI Levels. A Discussion Of Power Line
Disturbances And A Discussion Of Transients,
Including ESD, Lightning And EMP.
3. Victim Sensitivities And Behavior. A
Discussion Of Victim Sensitivities Including Amplifier
Rejection, Out-Of-Band Response, Audio Rectification,
Logic Family Susceptibilities And Interference- To-
Noise Versus Signal-To-Noise Ratios.
4. Safety Earthing/Grounding Versus Noise
Coupling. An Overview Of Grounding Myths, Hard
Facts And Conflicts. A Discussion Of Electrical Shock
Avoidance (UL, IEC Requirements), Lightning
Protection And Lightning Rods And Earthing.
5. Ground Common Impedance Coupling
(GCM). A Discussion Of Practical Solutions, From PCB
To Room Level. An Overview Of Impedance Of
Conductors (Round, Flat, Planes), Class Examples,
GCM Reduction On Single Layer Cards, Impedance
Reduction, DC Bus Decoupling And Multilayer Boards.
6. GLC Reduction Methods. A Discussion Of
Floating And Single-Point Grounds, Balanced Drivers
And Receivers, RF Blocking Chokes, Signal
Transformers And Baluns, Ferrites, Feed-Through
Capacitors And Opto-Electronics.
7. Cable Shields, Balanced Pairs And Coax. A
Discussion Of Cable Shields And Compromising
Practices, Shielding Effectiveness, Field Coupling,
Interactions Of Ground Loops With Balanced Pair
Shields, Comprehensive Grounding Rules For Cable
Shields, Flat Cables And Connector And Pigtail
Contributions To Shielding Effectiveness.
8. Cable-To-Cable Coupling (Xtalk). A Discussion
Of The Basic Model, Capacitive And Magnetic
Couplings, A Class Example And How To Reduce
Xtalk.
9. Understanding Shielding Theory. An Overview
Of Near-Field E And H, Far-Field, How A Metal Barrier
Performs And Reflection And Absorption.
10. Shielding Effectiveness (SE) Of Barriers. A
Discussion Of Performance Of Typical Metals, Low-
Frequency Magnetic Shields, Conductive
Coatings/Metallized Plastics And Aircraft Composites
(CFC).
11. Box Shielding. Leakage Reduction., Calculation
Of Apertures SE, Combination Of Multiple Leakages,
SE Of Screen Mesh, Conductive Glass, Honeycombs,
Component Penetrations (Fuses, Switches, Etc.), And
EMI Gaskets.
54 – Vol. 109 Register online at www.ATIcourses.com or call ATI at 888.501.2100 or 410.956.8805