Electromagnetic Compatibility (EMC) is the ability of a device or system to function acceptably in its electromagnetic environment without introducing intolerable electromagnetic disturbances to other devices in that environment.
Say, for example, that you use a microwave in your house. The microwave can affect the wireless LAN and Bluetooth connections and cause some problems. It is a case where the microwave is causing electromagnetic interference to devices via wireless LAN or Bluetooth.
Similar cases are found when a vacuum cleaner or hair dryer is used near the TV. Many forms of electromagnetic interference may prevent regular operation. The EMC measure ensures that a variety of different items of electronic equipment can operate nearby without causing any undue interference.
In other words, EMC comprises two key aspects: limiting its own electromagnetic emissions and having sufficient immunity to external electromagnetic disturbances.
- Emissions (or Electromagnetic Interference - EMI) refers to the generation of unwanted electromagnetic energy by a device. This energy can interfere with other nearby equipment.
- Susceptibility (or Electromagnetic Susceptibility - EMS) is the tendency of a device to malfunction when exposed to unwanted electromagnetic energy. Immunity is the opposite of susceptibility; it is a device's ability to operate correctly in the presence of such interference.
Nowadays, many things are electronic, and many wirelessly connected electronic devices operate simultaneously. EMC is of increasing importance.
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