CEC338 EMI / EMC PRE COMPLIANCE TESTING

 


Important Questions
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UNIT I NATURE AND ORIGINS OF ELECTROMAGNETIC COMPATIBILITY 


Source of EMI,EMI coupling to victim equipment**



Intersystem and Intrasystem EMI


EMC standards and specifications**



UNIT II TYPES of EMI COUPLING 



Conducted, radiated and transient coupling; Common ground impedance coupling


Common mode and ground loop coupling; Differential mode coupling, Near field cable to cable coupling**


 Power mains and Power supply coupling; Transient EMI**



UNIT III MEASUREMENT DEVICES FOR EMI 


Measurement by direct connection, Inductively coupled devices**


Antennas for radiated emission testing, Wideband antennas 


Magnetic field antennas, Type of antennas used in susceptibility testing**



UNIT IV RECEIVERS, ANALYSERS AND MEASUREMENT EQUIPMENT 


EMI receiver, Spectrum Analyzers**


RF power meter Frequency meters. Standards requiring immunity tests**


Electromagnetic transient testing, Transient types,

Continuous and transient signal


ESDelectrostatic discharge(2m) 



UNIT V PRE-COMPLIANCE TESTING TO AVOID EMC PROBLEMS 


Intersystem and Intrasystem EMC ,Developing an approach to EMC design **


Process flow chart,*** EMC strategy ,Solutions to avoid EMC


 Grounding; Bonding, Isolation transformer, Transient suppressors; EMI Suppression Cables.




PART-C
1.Compulsory Questions {a case study where the student will have to read and analyse the subject }
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UNIT I BASIC THEORY
Introduction to EMI and EMC, Intra and inter system EMI, Elements of Interference, Sources and Victims of EMI, Conducted and Radiated EMI emission and susceptibility, Case Histories, Radiation hazards to humans, Various issues of EMC, EMC Testing categories, EMC Engineering Application.
UNIT II COUPLING MECHANISM
Electromagnetic field sources and Coupling paths, Coupling via the supply network, Common mode coupling, Differential mode coupling, Impedance coupling, Inductive and Capacitive coupling, Radiative coupling, Ground loop coupling, Cable related emissions and coupling, Transient sources, Automotive transients.
UNIT III EMI MITIGATION TECHNIQUES
Working principle of Shielding and Murphy‟s Law, LF Magnetic shielding, Apertures and shielding effectiveness, Choice of Materials for H, E, and free space fields, Gasketting and sealing, PCB Level shielding, Principle of Grounding, Isolated grounds, Grounding strategies for Large systems, Grounding for mixed signal systems, Filter types and operation, Surge protection devices, Transient protection.
UNIT IV STANDARDS AND REGULATION
Need for Standards, Generic/General Standards for Residential and Industrial environment, Basic Standards, Product Standards, National and International EMI Standardizing Organizations; IEC, ANSI, FCC, AS/NZS, CISPR, BSI, CENELEC, ACEC. Electro Magnetic Emission and susceptibility standards and specifications, MIL461E Standards.
UNIT V EMI TEST METHODS AND INSTRUMENTATION

Fundamental considerations, EMI Shielding effectiveness tests, Open field test, TEM cell for immunity test, Shielded chamber , Shielded anechoic chamber, EMI test receivers, Spectrum analyzer, EMI test wave simulators, EMI coupling networks, Line impedance stabilization networks, Feed through capacitors, Antennas, Current probes, MIL -STD test methods, Civilian STD test methods.

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