EMC is the ability of a system to not cause electromagnetic interference to other equipment, and at the same time, it must be insensitive to emissions that may be caused by other systems.

Based on the CEM, equipment for measuring signals and electromagnetic fields in both conducted and radiated modes has been developed. The purpose of these tests is to determine the level of electromagnetic emissions and the susceptibility to certain signals from electrical-electronic devices.

The international standards that apply are:

CISPR (International Special Committee on Radio Disturbances). IEC (International Electrotechnical Commission). ISO (International Organization for Standardization). EN (European Standard). American Standard (FCC, MIL-STD).

An Electromagnetic Interference (EMI) is defined as the emission of electromagnetic energy that degrades or impairs the quality of a signal or the operation of a system.

One application is the analysis of magnetic coupling between a transmission line that is close to a buried pipeline.