Measuring and Monitoring EMC?Įmissions testing requires the use of EMI measurement equipment such as receiving antennas, amplifiers and spectrum analyzers. As a result, a wide range of testing equipment for EMC and EMI has been developed to give engineers a clearer picture of how a device will operate in real-world conditions. Failing to properly anticipate the EMC of a device can have a number of negative consequences, including safety risks, product failure and data loss. Measuring the amount of EMI generated by the device’s internal electrical systems – a process known as emissions testing – is another.īoth aspects of EMC are important design and engineering considerations in any system. Evaluating how a device will react when exposed to electromagnetic energy is one component of this, known as immunity (or susceptibility) testing. What Is Electromagnetic Compatibility (EMC)?ĮMC is a measure of a device's ability to operate as intended in its shared operating environment while, at the same time, not affecting the ability of other equipment within the same environment to operate as intended. This is particularly important in military-grade and avionics equipment, as well as devices requiring superior reliability in all situations. While EMI can be generated from any electronic device, certain equipment and components – such as cellphones, welders, motors and LED screens – are more likely to create disturbances than others.īecause it is rare for electronics to operate in isolation, products are generally engineered to function in the presence of some amount of EMI.
Sources of EMI can sometimes be naturally occurring environmental events, such as electrical storms and solar radiation but more often than not, the EMI source is another electronic device or electrical system. What are Sources of Electromagnetic Interference (EMI)? What is Electromagnetic Interference (EMI)?ĮMI can be defined as electromagnetic energy which affects the functioning of an electronic device. Testing requirements for EMI and EMC can become quite complex, with a wide range of industry- and application-specific implications that must be considered when bringing a product to market. This energy can be propagated through the air as electromagnetic radiation, and/or conducted along (or coupled onto) interconnecting I/O or power cables, which is typically referred to as ‘ disturbance voltages’. We think of electronics as closed systems, but, the electricity flowing through circuits and wires is never fully contained. In this article, we attempt to demystify EMI and EMC, and to provide a basic, general overview of the types of testing equipment employed, and the respective requirements in each area.Īny electronic device generates some amount of electromagnetic radiation. Because they are related in many ways, it’s easy to confuse the two. The terms Electromagnetic interference (EMI) and electromagnetic compatibility (EMC) are often used interchangeably when referring to the regulatory testing of electronic components and consumer goods.
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