Practical Shielding, EMC/EMI, Noise Reduction, Earthing and Circuit Board Layout

THE WORKSHOP

Any training class is a considerable investment in terms of cost and your time. You can’t afford to waste any of your precious time and you need to attend something that is useful and improves your productivity. After five years of presentation throughout the world, this workshop is well polished, practical and relevant.

The aim of this workshop is to help you identify, design, prevent and fix common EMI/EMC problems with a focus on earthing and shielding techniques. Learning how to fix earthing and shielding problems on the job can be very expensive and frustrating. Although it must be noted that most of the principles involved are simple, this workshop will give you the tools to approach earthing and shielding issues in a logical and systematic way.

This workshop focuses on the issues of interest to you if you are working in design, operation or maintenance of analog or digital systems involving sensors, data acquisition, process control,  cables, signal processing, programmable logic controllers, power distribution, high speed logic etc.

The circuit board layout section concentrates on design and layout of circuits and components on a printed circuit board.  The overall focus is on useful design and systems issues; not about regulations and standards.  The idea is that you will take this material back with you to your work and apply the key principles immediately to your design and troubleshooting challenges.

WHAT IS INCLUDED?

  • Receive a certificate of attendance in support of your continuing professional commitment
  • All workshops include the associated hardcopy technical manual
  • Printed workshop handouts
  • Lunch and refreshments
  • Interact and network with workshop attendees and experienced instructors
  • Practical, industry driven content to assist you in your continuing professional development (CPD)
  • Attendees automatically become IDC subscribers and receive exclusive deals and technical content every month

WHO SHOULD ATTEND?

  • Building service designers
  • CAD managers
  • Consulting engineers
  • Data systems planners and managers
  • Design engineers
  • Electrical and instrumentation technicians
  • Electrical contractors
  • Electrical engineers
  • Electrical inspectors
  • Electricians
  • EMC specialists
  • Electronics and systems engineers and technicians
  • Instrumentation and control engineers
  • Logic designers
  • Maintenance engineers
  • Mechanical engineers
  • Power system protection and control engineers
  • Printed circuit board designers
  • Project engineers
  • Safety professionals
  • Signal integrity specialists
  • Technical managers
  • Test engineers

CONTENT SUMMARY

INTRODUCTION

  • Fundamentals
  • Interference sources
  • EMI/EMC regulations

BASIC PRINCIPLES OF NOISE REDUCTION

  • Importance of wiring inductance
  • Bandwidth of pulse waveforms
  • Noise coupling examples
  • Common and differential modes
  • Balanced circuits and common mode rejection

PRINCIPLES OF EARTHING

  • What is “electrical earthing”?
  • Function of an earth
  • Safety and EMI
  • Analog/digital earthing
  • Single point, multipoint and hybrid earths
  • Earth grid technique
  • Isolated earthing technique
  • Earth loops
  • Earth loop noise reduction

DIAGNOSIS OF NOISE PROBLEMS

  • Relating symptoms to causes
  • Ringing, rounding and reflections
  • Practical methods of diagnosis
  • Noise coupling examples

NOISE REDUCTION TECHNIQUES

  • Minimisation of bandwidth
  • Best place to earth cable shield
  • Reducing mutual inductance

POWER CIRCUITS AND POWER SUPPLIES

  • Power quality and EMI
  • Filters and transient protection
  • Switch mode power supply design

INDUCTIVE AND CAPACTIVE SHIELDING

  • Materials and limitations
  • Openings and penetrations
  • Enclosure design techniques
  • Shielded racks and shielded rooms
  • Magnetic fields
  • Shielding design guidelines

REDUCTION OF ELECTROMAGNETIC COUPLING

  • Requirements of EM containment
  • EM shielding of cables
  • Seams and apertures
  • Shielding for ESD and RF
  • To shield or to filter?

SELECTION OF THE RIGHT CABLE AND CONNECTOR

  • Cable earthing
  • Cable crosstalk
  • Cable shielding and connectors

SIGNAL ROUTING AND LEAST IMPEDANCE

  • Controlling layout inductance
  • Signal integrity and EMC at the PCB level
  • Hidden “transmitters” and “receivers” and “antennae”
  • Trace routing and transmission line effects
  • Termination

NOISE COUPLING MECHANISMS

  • Magnetic causes of common mode current
  • Capacitive causes of common mode current
  • Identification of unintentional antennas
  • Controlling of kHz current paths

CIRCUIT BOARD EARTHING ISSUES

  • Identification of critical circuits
  • Clock and reset circuits
  • Embedded controllers and EMC
  • On board power regulators
  • Component placement
  • I/O treatments
  • Clock dithering

FILTERING CONDUCTED NOISE

  • Series blocking and shunt diverting
  • Filtering clock harmonics
  • Reduction of filter mutual inductance
  • Ferrite bead applications

DC POWER DISTRIBUTION AND DECOUPLING

  • Ideal DC power bus
  • Plane resonances and field containment
  • Reduction of capacitor inductance
  • Isolation of split power planes

COMPONENT PLACEMENT AND LAYER STACKUP

  • Optimal connector location and pin assignments
  • Lateral segregation by DC voltage
  • Layer stack up alternatives

CHASSIS, CABLE AND SYSTEM ISSUES

  • High Frequency (HF) design at connection/chassis interface
  • Reduction of chassis and cable resonances

 

PRACTICAL EXERCISES AND DEMONSTRATIONS:

  • Practical examples of broadband electrical noise
  • Measurement of stray L and C
  • Practical example of stray C coupling
  • Noise on Vcc and effect of decoupling capacitors
  • Ground bounce (noise)
  • Shielded box and correct termination of cable sheath
  • Effect of feed-through capacitor
  • Ferrite as an RF choke
  • Measurement of transmission line reflections
  • Electric-field and magnetic-field probes

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