EMC Basics
Principles of Interference Influence - Influence Model Influence model The electromagnetic influence of applications happens when a disturbance variable is transferred from an interference source through couplings to susceptible equipment. The description of the electromagnetic influence follows an influence model consisting of interference source, coupling and susceptible equipment:
Source of interference Interference sources are the origin of disturbance variables. Potential sources of interference are all applications in which electromagnetic energy is transferred. Interference sources can lie within (system internal) or outside of (system external) the system in question. Coupling The coupling of disturbance variables to susceptible equipment can happen in various ways: Galvanic: Coupling through a common circuit Capacitive: Coupling through the electric field Inductive: Coupling through the magnetic field Wave or radiation influence: Coupling through the electromagnetic field
Susceptible equipment Susceptible equipment is any device or component for which the functionality is disturbed by the disturbance variable. Disturbance (disturbance variable) A disturbance variable (interference) can be electrical voltage, currents, electrical and magnetic fields. They are caused by electromagnetic proceedings, have a broad amplitude and frequency range over varying amounts of time and result in a reduction of functionality in susceptible equipment of varying intensity.
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