The electromagnetic compatibility
The electromagnetic compatibility (EMC) It is a discipline of electrical engineering and electronics, and has the aim to ensure that multiple devices, operating close to or interconnected with each other, continue to function properly without mutual interference.
To ensure compatibility between two devices must comply with two basic requirements:
- the equipment must not emit too much disturbance,
- the equipment must not be too sensitive to disturbances.
The electromagnetic compatibility, in addition to the disturbances from electrical and electronic equipment, considers two other important sources of interference:
- the voltage pulses generated by meteorological phenomena and lightning,
- electrostatic discharges coming mainly from the contact of man with the equipment.
In general, the transmission of electromagnetic fields follows two possible ways:
- the conducted way,
- the radiated way.
The disturbance is transmitted radiated when propagating in free space, while it transmits conducted when running along the equipment interconnecting cables.
Although the principles are relatively simple, verification techniques differ depending on the product to be tested and, in several cases, They will require specific test environments and specific instrumentation.