What is EMC?

EMC = ElectroMagnetic Compatibility

So, what does that mean? Well… two internationally accepted definitions follow:

IEEE - Institute of Electrical and Electronics Engineers, Inc (USA):

"Origin, control, and measurement of electromagnetic effects on electronic and biologic systems."

IEC - International Electrotechnical Commission (International):

"The ability of an equipment or system to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment."

Both definitions cover the pertinent issues. In general: Electromagnetic compatibility is the capacity of a system or product to function as intended in its electromagnetic environment but not itself be a source of electromagnetic interference to other entities such as electronic, biologic, fuel and ordinance systems.

But, why are we concerned about EMC?

Simply put:

• Electromagnetic emissions are generated by most electronic equipment today.
• These emissions are sometimes useful and many times not.
• And these emissions can be harmful to various entities.

Electromagnetic effects, intentional or incidental, emanating from operating electronic equipment can affect other entities, such as electronic, biologic, fuel and ordinance systems, to measurable and sometimes detrimental extents. So, it is the safe operation of electronic equipment to prevent destruction or disruption of these other entities, which have most Governments and many individuals interested in EMC.

What does EMC have to do with product development?

• Electronic products developed for most markets almost anywhere in the world must control emitted and received frequencies according to very specific regulations.
• Control of EMC to meet these regulations is called 'Compliance'
• EMC compliance must begin in the product design and development stages.