Principles of EMC Design & Test

Introduction

Preparing a product or system for EMC testing can be a daunting task. Inadequate preparation can result in costly delays, frustration and failures.

TÜV Product Service has developed a training course for manufacturers of electrical/electronic equipment, designed to deliver a thorough and cost-effective method of ensuring products are properly prepared for EMC compliance testing. Delegate participation is actively encouraged during the course and the learning experience is reinforced by the use of demonstrations, worked examples and case studies.

Course Overview

Meeting target launch dates and maintaining development costs within budget are just two of the many problems faced by manufacturers and producers of electrical and electronic products. Electromagnetic compatibility (EMC) compliance to the European EMC Directive or other contractual requirements, such as military, aerospace or automotive standards, must be catered for in the development programme. Achieving EMC is now recognised as one of the key indicators of a well-engineered product. In common with all design considerations, addressing EMC early in the design process, and careful management throughout product development, can save significant time and money, and minimise delays in production.

The course objective is to provide a thorough understanding of the fundamentals of EMC and the application of this knowledge in;

• Formulating a set of EMC design rules
• Planning a cost-effective and thorough test programme

Course Content

Day 1- EMC Principles

1.  Basic principles: Coupling mechanisms, frequency & time domain, wavelength, capacitance, inductance, resonance, EM fields, near & far field; demonstration of E & H field coupling.
2. Current management: Current return path, self & mutual inductance, loop area, ground plane current flow & effect of slots, shield current flow & effect of apertures, structural geometry & bonding, current paths in ESD events; demonstration of return current in a ground plane and/or cable pair.
3. Cables & Coupling: Common and differential mode coupling, RF susceptibility & emissions, screening, transfer impedance, structural geometry; demonstration of CM versus DM emissions.
4. Filtering, Shielding and Transient Suppression.
5. Case studies: 3 studies on improvements to common design practice & wrap-up discussion.

Day 2 - EMC Test Planning

1. Why we need EMC tests: Protection of radio reception, immunity to radio transmitters and transients. The EMC Directive and other related EU Directives. The standards generating structure: CISPR, IEC, CENELEC, MIL, DEF STAN, automotive.
2. Content of the test plan: Description of test plan content, evaluation of test results.
3. Overview of the required tests: Conducted emissions on AC/DC supply and signal lines, radiated E&H-field emissions, mains harmonics and flicker emissions, radiated E&H-field immunity, conducted LF & RF immunity, transient and ESD immunity.
4. Case Studies: Develop test plans for 3 example products; defence, small & large commercial products and wrap-up discussion.

Benefits of Attending

1. A greater understanding of the basic mechanisms of EMC and their application to the design of a product.
2. A greater understanding of EMC tests and how to prepare for them in advance.
3. The likelihood of first-pass compliance through application of the knowledge gained.

Who Should Attend

The course is intended for compliance engineers and electrical/electronic engineers involved in the design, development, testing and production of electrical and electronic equipment.

For further information or to book a place on one of our open courses, please contact Sandie Peacock, speacock@tuvps.co.uk.

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