EMC Diagnostics and Fixes

This one-day seminar provides the fixes to EMC problems that must be corrected in the later stages of a product's development. The speed that the fix can be implemented is emphasized over the cost of the changes. Diagnostic techniques to determine the necessary solutions are also covered. Fixes for both radiated and conducted emission problems are presented. Although emphasis is on existing equipment that has a problem, the same principles can be applied to new designs to avoid the problem.

This seminar is intended for EMC engineers and test technicians who have to fix EMC problems "after-the-fact." Electrical and mechanical design engineers that want to learn more about fixing EMC problems will also find this seminar useful.

Outline

INTRODUCTION

Approach
Predominant Effect
Implementation of Fixes
Review of EMC Basics
Diagnostic Techniques

RADIATED EMISSION - NO CABLES

Differential Mode Radiation
Reducing Energy in the Source
Containment
Shielding
Grounding
Decoupling
Clock Signal Control

RADIATED EMISSION - WITH CABLES

Measuring Common-Mode Currents
Single Stage Filters/Multi-Stage Filters
Logic Ground-Chassis Ground Connection
Treatment for Shielded Cables
Proper Shield Terminations
Treatment for Unshielded Cables
Causes & Fixes for a "Hot Chassis"
Diagnostic Techniques
The Use of Image Planes

CONDUCTED EMISSION (AC POWER LINE)

Separating Differential-Mode & Common-Mode Emissions
Diagnostic Techniques
Differential-Mode/Common-Mode Fixes
Power Line Filters
Source Suppression - Power Supply/Digital Logic

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Henry Ott Consultants

48 Baker Road Livingston, NJ 07039

Phone: 973-992-1793, FAX: 973-533-1442

e-mail: h.ott@att.net

June 26, 2001