EMC of instrumentations systems

Goals

The objectives of the training EMC of instrumentations systems :

At the end of this training course, trainees will be able to master the cabling and implementation of sensitive measurement installations in research and industry.
• 17 to 19.03.2026 - Grenoble
• 17 to 19.11.2026 - Trappes

The aim of this training course is to:

• Be able to identify and understand EMC couplings


• Be able to identify sources of interference


• Be able to apply low-frequency protection methods


• Be able to apply high-frequency protection methods


• Know how to adapt EMC investigation measurement methods on site

Program

1 - Introduction
• What is EMC?
• Representation of a sinusoidal and trapezoidal signal
• Time-frequency relationship
• Definition and characteristics of an electromagnetic wave
• Relationships between conduction and radiation
• Use of decibels
• Common mode/differential mode
• Low/high frequency limit
• Envelope detection
• Digital circuit interference


2 - The 6 types of coupling
• Ground coupling
• Conductor impedance
• Capacitive coupling between board and ground
• Electrostatic shield
• Crosstalk coupling
• Magnetic field coupling
• Loop voltages
• Electric field coupling
• Metal plane shielding


3 – Earth and ground
• Definitions of earth and ground
• Role of the earth network
• Earth resistance
• Safety conductors
• Ground network
• Equipotentiality and EMC
• Ground loops and between grounds
• Problems with star grounding
• Ground meshing


4 – LF disturbance sources
• The 4 low-voltage neutral schemes
• Orders of magnitude of currents in grounds
• Sources of 50 Hz magnetic fields
• Radiation from a transformer
• Sources of 50 Hz electric fields
• Effects of lightning on equipment


5 – HF disturbance sources
• Radiation from radio transmitters
• HF industrial equipment
• Switching converters
• Variable speed drives
• Dry contact bounce


6 – Low frequency protection
• Common mode rejection by isolation
• Symmetrical differential connection
• Equipment with guard in noisy environment
• Isolation transformer
• Optocouplers
• Effect of a filter on a pulse
• Surge arresters
• Necessity of surge arresters
• Choice of surge arrester type
• Examples of surge arresters
• Implementation of surge arresters


7 – Filtering of HF disturbances
• Different types of filter
• Different low-pass filter diagrams
• Use of ferrite cores
• Common mode choke
• Mains filters
• Rules for installing a mains filter
• HF filtering of signals


8 – Shielded cables
• Transfer impedance
• Principle of the reducing effect
• Measuring the reducing effect
• Connecting shielded cables
• Special case of low-frequency common mode
• Over-shielding
• Reducing effect of cable trays
• Connecting cable trays
• Wiring very low-level sensors
• Thermocouples
• Connecting shielded connectors
• Signal classification
• Wiring rules


9 – Electrical and EMC measurements
• Resistance measurement
• Characteristic impedance of a line
• Measurement of the characteristic impedance of a line
• Losses in coaxial cables
• Passive oscilloscope probe
• Active voltage probes
• Measurement of common mode voltages between grounds
• Construction of an HF current clamp
• Conducted immunity test on site