84415 - Electromagnetic Compatibility and Laboratory Techniques T

Learning outcomes

The course provides the basic knowledge of electromagnetic compatibility, with particular reference to conducted and radiated disturbances, coupling paths and guidelines to design systems which are electromagnetically compatible with their environment. Moreover, the main measurement methods and instruments used in the international and national standard framework are examined, with particular reference to the EU EMC Directive. Particular emphasis is given to practical aspects and the classes are supported by computer and laboratory demos.

Course contents

Introduction to electromagnetic compatibility (EMC)

Examples of EMC problems. Main sources of electromagnetic disturbances. Emission and immunity. Conducted disturbances and radiated disturbances. Typical EMC units of measurement.

Nonideal behaviour of electrical circuit components

Real lumped component models of conductors, capacitors, inductors and resistors. Resistance and inductance of conductors versus frequency. Frequency response of the impedance of real lumped components: capacitors, inductors, resistors.


Conducted emissions

Common mode (CM) and differential mode (DM) conducted disturbances. Sources of conducted interference. Standards. Methods and instruments of measurement. Spectrum analyzer and EMI receiver basics. Line impedance stabilization network (LISN). Current probes. Troubleshooting conducted interference: filters, power supply, positioning of components inside the equipment. EMI Filters: insertion loss, block of CM and DM interference, filtering problems.


Radiated emissions

Model of emission for DM currents. Model of emission for CM currents. Standards. Methods and instruments of measurement. Radiated emission test sites. Troubleshooting radiated emissions.


Conducted immunity

Conducted immunity issues. Immunity testing. Disturbances in the distribution networks. Pulsed disturbances: burst, surge and test systems. Voltage variations and test systems. Electrostatic discharges. Standards.

Radiated immunity

Radiated immunity issues. Bifilar line terminal voltages induced by a uniform plane wave. Standards. Methods and instruments of measurement. Test sites. Troubleshooting radiated immunity. Basics of electromagnetic shielding.


EMC antennas

Antenna basics. Examples of EMC antennas: monopole, dipole, biconical, logperiodic and bilog antennas. Antenna factor and antenna bandwidth. Baluns.

EMC Directive 2014/30/EU

Scope and definitions. Conformity assessment procedures for electric and electronic equipment. EMC analysis flow chart.

Readings/Bibliography

C. R. Paul, Introduction to Electromagnetic Compatibility, Wiley, 2nd Ed. 2006.

H. W. Ott, Electromagnetic Compatibility Engineering, John Wiley & Sons, 2009.

Teaching methods

Lectures consisting of:

• illustration and comment of slides
• further developments on the blackboard
• numerical exercises on the blackboard
  

Laboratory demos will help students to better understand the material covered in the lessons.

Assessment methods

Oral exam. Possibility of midterm written exams that can be integrated with an oral exam.

Teaching tools

Handouts of the slides are available to students on Insegnamenti OnLine.

Office hours

See the website of Leonardo Sandrolini