MODULE DETAILS

 

Module 16: Practical Shielding, EMC/EMI, Noise Reduction, Earthing and Circuit Board Layout of Electronic Systems

 

Nominal duration: 2 weeks (24 hours total time commitment)

 

This time commitment includes the preparation reading, attendance at each webinar (1 hour plus 15-30 minutes for discussion), and the time necessary to complete the assignments and further study.

 

MODULE PURPOSE

 

This module covers the identification, design, prevention, and fixing of common EMI/EMC problems encountered in Industrial plants. It also covers the design and layout of circuits and components on a printed circuit board to minimise noise generation.

 

PRE-REQUISITES MODULE, UNITS /

 

CO-REQUISITES

 

Module 15

 

ASSESSMENT STRATEGY

 

To evaluate the achievement of the learning outcomes; written assignments, group projects and practical exercises are set.

 

SUMMARY OF LEARNING OUTCOMES

 

1. Outline the basic principles of EMI

 

2. Examine the concepts of earthing and shielding

 

3. Examine noise issues with cables, connectors and circuits

 

4. Examine the application of protection and filtering components

 

5. Examine noise-related PCB design issues

 

Learning Outcome 1

 

Outline the basic principles of EMI

 

Assessment Criteria

 

1.1

 

Examine the coupling mechanisms for electromagnetic interference

 

 

1.2

 

Examine electromagnetic field theory

 

 

1.3

 

Examine coupling modes of EMI

 

 

 

 

1.4

 

Examine the sources of transient noise

 

 

1.5

 

Examine the relationship between spectrum usage and created interference

 

 

1.6

 

Examine the Fourier representation of EMI

 

Learning Outcome 2

 

Examine the concepts of earthing and shielding

 

Assessment Criteria

 

2.1

 

Examine the methods by which LF magnetic shielding is accomplished

 

 

2.2

 

Examine the effects of apertures on shielding effectiveness

 

 

2.3

 

Examine the practical issues for gaskets and sealing

 

 

2.4

 

Examine the approaches possible for ventilation shielded devices

 

 

2.5

 

Examine the principles involved in PCB shielding

 

 

2.6

 

Distinguish between safety grounds (earthing) and signal grounds (EMC function)

 

Learning Outcome 3

 

Examine noise issues with cables, connectors and circuits

 

Assessment Criteria

 

3.1

 

Examine the fundamental cable parameters and their EMC implications

 

 

3.2

 

Examine the importance of cable routing and screening techniques

 

 

3.3

 

Compare the different types of screened cables and screened connectors

 

 

3.4

 

Examine the EMC effects of stray capacitance and lead inductance

 

 

3.5

 

Examine the methods to reduce noise emitted by various components

 

 

 

Learning Outcome 4

 

Examine the application of protection and filtering components

 

Assessment Criteria

 

4.1

 

Examine the application of filters for reducing interference

 

 

4.2

 

Examine the practical issues of filter mounting and shielding

 

 

4.3

 

Examine the effects of impedance matching on filter performance

 

 

4.4

 

Examine the application of the following Surge

Protection Devices (SPD): (a) Gas Discharge tubes (b) Metal Oxide Varistors (c) Avalanche Diodes

(d) Thyristor devices

 

 

4.5

 

Compare SPDs in terms of: (a) Ratings

(b) Fusing

 

(c) Correct positioning

 

(d) Application

 

Learning Outcome 5

 

Examine noise-related PCB design issues

 

Assessment Criteria

 

5.1

 

Examine PCB design techniques to reduce noise problems

 

 

5.2

 

Examine the differential and common mode coupling issues with PCBs

 

 

 

 

5.3

 

Examine good PCB design techniques, specifically in relation to:

 

(a) Board layout

 

(b) Planes and layering

 

(c) Grounding

 

(d) Decoupling

 

(e) Transmission lines

 

Delivery mode

 

A combination of asynchronous and synchronous e-learning delivery comprising a judicious mix of interactive online web conferencing, simulation (virtual labs) software, remote online labs, online videos, PowerPoint slides, notes, reading and study materials (in PDF, HTML and Word format) accessed through the Moodle Learning Management System (LMS).

 

Software/Hardware Used

Software

  • N/A

Hardware

  •  N/A