EMC and ESD Lab Techniques for Designers

Course summary

EMC and ESD Lab Techniques for Designers



Overview

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EMC and ESD Lab Techniques for Designers (troubleshooting to proactively avoid field or compliance problems)

This course covers advanced techniques for troubleshooting design problems both in the laboratory and in field installations. Doug Smith, the Course Tutor, has developed these techniques over more than 30 years working in this field.

Although very effective, most of the techniques are not published and are unknown to others, even experienced engineers.

This course delivers practical knowledge that can be used immediately on the job. Some class time is reserved to discuss problems and interests of those attending. Each class delivery is modified to fit the interests of the attending people.

"This course can help minimise the chance that an EMC issue appears just before product introduction. It can be the best insurance your company can buy against the consequences of a design problem."

Doug Smith, course tutor

This course can be taken in conjunction with the High Frequency Measurements course for a discount fee of £1611.00 (a savings of £179.00). To register for both courses, select the discount package on checkout.

This course is part of Oxford University's High-Speed Digital, Analogue and EMC Engineering Month.

Course description

This course covers techniques for finding design issues that may cause EMC compliance problems early in the design cycle, long before an official EMC test. This can be accomplished in the development lab without a lot of expensive, complicated EMC equipment. These techniques are easy to use and can find a wide range of potential EMC problems in a design on the lab workbench.

Most of the procedures taught have solved major design problems in a few days or sooner that were unsolved by a team of engineers, in some cases over a period of months. Some of the techniques presented are very effective at reproducing problems that occur in the field infrequently, for instance in one customer in a thousand or only a few times per year, but that can have serious consequences.

There are techniques covered in the course that are applicable from tens of kHz to tens of GHz and these often succeed when standard techniques of circuit debugging have failed. A few of the many techniques covered in the course include:

  • noise injection though mutual inductance to find layout defects on printed wiring boards that cause SI and EMC problems
  • finding resonant frequencies of physical structures
  • determining risk from mobile phones without an expensive setup
  • easily determining if a package has suitable parasitics for the die inside as well as tracking down EMC problems caused by package parasitics

image of broadband amplifierThe application of each technique is described in depth and shows how to interpret the results. A list of recommended equipment is presented and demonstrations show some of the more unusual ways of using the equipment.

Emphasis is placed on delivering practical knowledge that can be used immediately on the job. Some class time is reserved to discuss the specific problems and interests of those attending.

Benefits

  • Learn the simple theory behind easy to use development lab tests that can find EMC problems
  • Discover how to find and evaluate potential EMC problems with readily available lab equipment
  • Learn to measure the resonant frequency of physical structures like heat sinks or edge connectors
  • Investigate the design errors than can cause EMC problems and how to find them in a design
  • Learn to measure EMI currents in systems and recognize when they are a problem
  • Understand how to relate the easily measurable relative phase of EMI currents to fixing EMC problems
  • Learn construction techniques for useful laboratory apparatus that can track down problems
  • Learn how to use test equipment you already have in novel ways to find EMC problems in a design
  • Learn techniques for tracking down difficult design or equipment problems in the lab or field
  • Learn to reproduce in the lab difficult field problems that happen intermittently
  • Develop an understanding for the kinds of design issues and noise sources that cause designs to fail
  • Learn how to locate and deal with the sources of noise that cause problems in designs
  • Learn about noise related reliability problems in system, board, and device design
  • Learn to apply troubleshooting techniques in a logical way to uncover design problems
  • Learn construction techniques for useful laboratory apparatus that can easily track down problems
  • Learn how to use test equipment you already have in novel ways to find design problems

Videos

Visit the links below to view additional videos by Doug Smith.

Hand Metal ESD
High Speed Validation Techniques MP4
PCB Troubleshooting Using Direct RF Injection
Switching Power Supply Noise - Magnetic Fields

 

Programme details

Test and measurement equipment for this course is supplied by Agilent Technologies.

Course content

Technical Background

  • Loop theory and resonant frequency of physical structures
  • Common mode current relationship to EMC emissions
  • Using current probes to find EMC problems
  • Design of system cables and connectors and their relationship to EMC
  • Differential signals: how much do they help?
  • Skin effect
  • Capacitively coupled noise currents
  • Inductively coupled noise voltages
  • Coupling to/from small loops and tracing noise currents through circuits and systems
  • Electrical Fast Transients and how to use them for troubleshooting a wide range of problems
  • di/dt and dv/dt effects in circuits
  • Null experiments to verify results

Tools Discussed

  • Commercially available equipment
  • Simple to build probes
  • Scopes and Spectrum Analyzers
  • Simple lab built structures useful for troubleshooting
  • Sources of equipment and supplies for troubleshooting

Techniques and Methods

  • Measuring resonant frequencies in a system and relating them to potential EMC problems
  • Measurement of common mode currents and relative phase to predict EMC problems
  • Evaluation of heat sinks, board edge connectors, and other physical parts of a system
  • Unconventional uses for conventional test apparatus
  • Interpreting measurement results

Hands-On Experiments

  • Sources of common mode current and connector design
  • Resonant frequency of a circuit board mounted over sheet metal (by class attendees)
  • Shielding effectiveness (by class attendees)

Stressing Devices, Circuits, and Systems to Elicit Failure Modes

  • Methods of injecting localized, controlled amounts of noise
  • Use of magnetic loops and current probes in novel ways
  • Logical approach to avoid "wild goose chases"
  • Useful home built apparatus
  • Unconventional uses for conventional test apparatus
  • Stressing designs with both impulses and continuous signals

Measurements to locate problems

  • IC package noise
  • Interpreting scope waveforms to determine the characteristics of environmental noise sources
  • Techniques to locate an environmental noise source

Recommended equipment and sources

  • Probes
  • Test equipment
  • List of sources

Additional new content: Electrical Resonances in Physical Structures

How to measure resonances

  • Direct measurements
  • Measurements using magnetic probes and a spectrum analyzer/network analyzer

Examples of measurements and implications

  • PCB plane resonance
  • Simple BNC connector
  • PCB mounted over metal/another board
  • Time domain
  • Frequency domain
  • Chassis resonance and ESD performance
  • RFID antenna (~10 MHz) spurious resonances @200 MHz and emissions
  • Resonance on a PCB path on development PCB
  • Heat sink resonance - an EMC examples
  • Resonance in a system cable

Methods to kill the Q of resonances

Effect of system resonances on emissions and radiated immunity

Effect of system resonances on ESD performance

Testing resonances to see if they are a problem

Equipment recommendations

  • Spectrum Analyzer/Network Analyzer
  • Directional Coupler
  • 2 Watt power amplifier

and finally....

  • A refined method of measuring structural resonances in systems -
    Measuring structural resonances is very useful in debugging and preventing problems in SI and EMC
  • A simple development lab technique to determine the risk nearby mobile phones pose to electronic equipment without the need for expensive equipment. This test cannot be done easily using a cell phone because one cannot control the frequency or power level without expensive, hard to find equipment
  • Using coupled bonding conductors for equipment protection and to reduce system noise
  • This new practical demonstration, performed by those attending, uses the techniques taught in the course to find a layout defect on a live logic board

All those attending will also receive a CD-ROM. The CD-ROM will contain data including the course notes in pdf format, a variety of published technical articles, an image of the course presenter's technical website and a tutorial plus a Technical Tidbit audio file from the presenter's subscription website.

Certification

Participants who attend the full course will receive a University of Oxford Certificate of Attendance. The sample shown is an illustration only and the wording will reflect the course and dates attended.

Accommodation

Accommodation is available at the Rewley House Residential Centre, within the Department for Continuing Education, in central Oxford. The comfortable, en-suite, study-bedrooms have been rated as 4-Star Campus accommodation under the Quality In Tourism scheme, and come with tea- and coffee-making facilities, free Wi-Fi access and Freeview TV. Guests can take advantage of the excellent dining facilities and common room bar, where they may relax and network with others on the programme.

Accommodation is not included in the course fee.

Fees

Course fee, standard: £895.00
Discount Package (add High Frequency Measurements): £1611.00

Payment

Pay immediately online by credit or debit card

Click the “book now” button on this webpage to pay online with a credit or debit card

Pay later with your preferred payment method

Send a completed application form to the course administrator by e-mail or post, and choose:

  • Request an invoice
  • BACS payment
  • Cheque payment
  • Credit or debit card payment. Please do not send card details via email

Fees include course materials, tuition, refreshments and lunches. The price does not include accommodation.

All courses are VAT exempt.

Tutors

Mr Douglas Smith

Speaker

Consultant
D. C. Smith Consultants

Mr Smith held an FCC First Class Radiotelephone license by age 16 and a General Class amateur radio license at age 12. He received a B.E.E.E. degree from Vanderbilt University in 1969 and an M.S.E.E. degree from the California Institute of Technology in 1970. In 1970, he joined AT&T Bell Laboratories as a Member of Technical Staff. He retired in 1996 as a Distinguished Member of Technical Staff. From February 1996 to April 2000 he was Manager of EMC Development and Test at Auspex Systems in Santa Clara, CA. Mr. Smith currently is an independent consultant specializing in high frequency measurements, circuit/system design and verification, switching power supply noise and specifications, EMC, and immunity to transient noise. He is a Senior Member of the IEEE and a former member of the IEEE EMC Society Board of Directors.

His technical interests include high frequency effects in electronic circuits, including topics such as Electromagnetic Compatibility (EMC), Electrostatic Discharge (ESD), Electrical Fast Transients (EFT), and other forms of pulsed electromagnetic interference. He also has been involved with FCC Part 68 testing and design, telephone system analog and digital design, IC design, and computer simulation of circuits. He has been granted over 15 patents, several on measurement apparatus.

Mr Smith has lectured at Oxford University, Vanderbilt University, AT&T Bell Labs, and at many public and private seminars on high frequency measurements, circuit design, ESD, and EMC. He is author of the book High Frequency Measurements and Noise in Electronic Circuits. His very popular website, www.emcesd.com (www.dsmith.org), draws many thousands of visitors each month to see over 60 technical articles as well as other features.

www.emcesd.com - Doug Smith's High Frequency Measurements website, which contains a wealth of interesting technical information

Teaching methods

The course includes a combination of teaching methods including lecture, live experiments, live computer simulations, and still pictures of experiments with results. The combination of methods combined with Mr. Smith's enthusiastic presentation style helps the students learn and enjoy the course.

Emphasis is placed on delivering practical knowledge that can be used immediately on the job. Some class time is reserved to discuss problems and interests of those attending. Each seminar delivery is modified to fit the interests of the attending students.

Application

If you would like to discuss your application or any part of the application process before applying, please contact:
Course Administrator
Tel: +44 (0)1865 286958
Email: electronics@conted.ox.ac.uk

Level and demands

This course is ideal for all circuit designers, system designers, design supervisors, EMC personnel, manufacturing test engineers, quality engineers, and field support engineers will find the material useful.

Prerequisites

A university-level course on circuit analysis is desirable although the course will be useful to those with two-year technical degrees. Desirable, although not required, is the two-day course by Mr Doug Smith, High Frequency Measurements, either before or after taking this course.