In the far field, the distance of EUT and antenna is more than the wavelength. In the near field, the distance between the antenna and EUT is less than the wavelength. The measurement distance is crucial because it is a Far Field test, ensuring that distance of measuring the field strength in the far field which is opposite to Near Field. The distance between the Equipment under Test (EUT) and the antenna is 3m, 10m, or 30m.
The open area test site is the most common radiated emission test site, also known as OATS. Because this emission travels through the air, it is called radiated emission. This test involves measuring the EMI in the air that is unintentionally emission generated by the device under test. This test ensures that the device does not emit any harmful electromagnetic field or harm any other device due to its interference.īelow are some of the most common tests performed by the EMC lab on devices. In, Canada the EMC standard is regulated by Industry Canada.Īn EMI test is required to bring a new product to market. In the USA, EMC standards are defined by FCC (Federal Communications Commission). The regulation can be varied according to different countries.
Every device emits EMI, but the EMC standards of the country regulate this emission. The above image is a diagrammatic representation of those emissions.Įlectronic devices may produce any magnetic interference in the environment. We have already talked about the types of emissions in the previous article.
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