EMC Test - An Overview Business Articles | July 30 cheap air max 90 , 2011 First of all, EMC test, i.e., Electromagnetic Compatibility Test, is a set of procedures that test the electromagnetic emissions and immunity of a product. It involves testing to ensure that there is minimal interference or noise. EMC test must follow FCC compliance procedures. There are certain guidelines that FCC has set in order to ensure compliance.
EMC test, i.e., Electromagnetic Compatibility Test, is a set of procedures that test the electromagnetic emissions and immunity of a product. It involves testing to ensure that there is minimal interference or noise. EMC test must follow FCC compliance procedures. There are certain guidelines that FCC has set in order to ensure compliance.
Before getting to EMC testing, we must first know what is EMC? Electromagnetic Compatibility is a field of electrical sciences that involves studies related to unplanned production, transmission and reception of electromagnetic energy with respect to the unwanted effects of EMI, electromagnetic interference. Electromagnetic capability test or EMC test aims at normal operation in the presence of interference.
To ensure the normal operation in the presence of electromagnetic interference, the EMC test follows two specific matters ? emission and susceptibility. Problems pertaining to emission are related to unnecessary electromagnetic energy, produced by the product being tested. There are many technical aspects that can be investigated, so as to diminish unwanted generation of energy and ensure that minimal energy is radiated into the environment. Problems pertaining to susceptibility include inappropriate product operation, while electromagnetic disturbances exist in the environment. Mitigation of interference is achieved mainly through controlling both emission and susceptibility problems. This involves investigation and mitigating the different sources and causes of interference and noise.
When we talk about electromagnetic interference, we take into account all types of interferences. Here are a few types of interferences, discussed in details.
???? Continuous interference ? Continuous wave interference occurs at a place where the source emits a particular frequency range. This form of interference is divided into several sub-categories, in accordance to the frequency range. Audio frequency ranges from as low frequencies as 50 Hz. The sources of Audio frequency are supply units, power amplifiers, loudspeakers, and FM radio transmission. Radio frequency ranges from 20 KHZ to a level that may increase with the push of technology. The sources of Radio Frequency interference include wireless transmissions, radio and TV receivers, and medical and industrial equipment. Broadband interference may be scattered in parts of both frequency ranges. There is no specific frequency range for this one. The sources of Broadband interference are CDMA telephony and solar activity.
???? Pulse interference ? electromagnetic pulse, that is, EMP, occurs when the source radiates a short-duration energy pulse. It is also called transient disturbance. The emitted energy is generally broadband by nature, but it may often excite a narrow band damped sine wave response.
Federal Communication Commission Compliance, FCC compliance, supervises EMC testing in the US. Most of the electrical equipment that is sold in the U.S. has to meet the particular restrictions for electromagnetic emissions. The supervising body, Federal Communications Commission is responsible for setting rules and standards under the CFR 47. FCC testing is mandatory for EMC testing devices and electrical equipment. According to FCC compliance rules, the manufacturer must certify non-intentional radiators that are used in industrial environments, residential environments and for business purposes. Appropriate measures have to be taken in order to ensure FCC compliance.
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