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Knowledge Center > Resources


WHAT IS EMC TESTING?

EMC is an acronym for Electromagnetic Compatibility (or Compliance). All
electronic devices have the potential to emit and be susceptible to
electromagnetic fields. With the continuous increase of electronic device into
everyday life, there is a huge potential for devices to interfere with each
other. No electrical product or installation design can be considered complete
unless all EMC aspects are considered. This is not only important for commonly
used consumer products such as television sets, computers, washing machines,
etc.; it is especially important for larger commercial products such as
vehicles, aircraft, ships, and large industrial installations. Without
standardized EMC testing, the consequences of equipment malfunction due to EMC
interference could be disastrous in cases such as aviation or automotive
applications, where life and safety are at stake. For example, the signal from
your cell phone interfering with air traffic control tower signals, or traffic
radar affecting the operation of a vehicle’s engine control or braking system
electronics.

EMC test standards have been developed to provide defined test processes for
testing electronic devices. These standards originating from governmental
bodies, manufactures, industry groups, or military requirements are important so
that EMC testing is performed consistently between test labs, variables are
reduced or eliminated, and test results are reproducible.

Different EMC test standards apply to different product categories or usages.
For example, vehicle manufacturers, the aviation industry, governmental
requirements, military, medical, commercial, large companies, etc., all follow
different EMC standards based on their product’s category. EMC testing ensures a
product meets the appropriate standards to sell into a market. When determining
the EMC test standard that applies to a product, the first step is to determine
the category the product falls into. Secondly, it is important to consider the
country where the product will be sold, as test requirements/certifications can
vary in different countries.

EMC testing can be broken down into two broad classifications; Immunity tests
(also called Susceptibility) and Emissions tests. Immunity testing tests the
ability of a product to function normally when being subjected to external
signals. This test confirms the product will still work correctly, even if other
signals are nearby. Emissions testing measures the magnitude of signals the
product is producing and unintentionally emitting; these are unwanted signals
being emitted from the product that have the potential to affect other
electronic equipment in the vicinity.

Immunity and Emissions testing categories can additionally be subdivided into
Radiated and Conducted testing methods. Radiated Immunity testing consists of
subjecting a product to external signals radiated from an antenna. Conducted
Immunity testing is performed by injecting signals into cables which conduct
these signals into the product. In a similar manner, Radiated Emissions measures
the emissions that emit from a product, while Conducted Emissions measures the
emissions from a product that are directed through cables.

EMC Testing is a necessary step in a product's development cycle since it
provides evidence that your product complies with relevant EMC regulations and
directive(s). After a successful test program, you can be confident that your
product’s reliability will be increased, thus reducing warranty issues,
servicing costs, and encouraging brand loyalty. Testing also highlights
potential issues or problems with the product that can be fixed before
production. Having the right EMC test equipment and design provided by a
reliable strategic partner plays a key role in your product's long-term success.

Learn more about EMC Testing by reading EMC 101


USEFUL EMC TESTING LINKS

AR has developed some posters to assist you with your EMC testing needs:

 * EMC testing “Tools of the Trade”: Commonly used EMC equations, unit
   conversions, frequency bands, and more.
 * Radiated and Conducted Immunity Test Requirements & Solutions: Test levels
   and setups for various Immunity Test standards.
 * RF & EMC Formulas and Charts: An extensive compilation of EMC equations,
   conversions, and information.



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