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What is EMI, EMS and EMC?
Posted:02:03 PM August 20, 2018 writer: G

EMI (Electro Magnetic Interference) literal translation is electromagnetic interference. This is a compound word, we should consider "electromagnetic" and "interference" separately.

The so-called "interference" refers to the meaning of the interference source after the device is interfered with and the interference source that interferes with the device. The first layer means that lightning causes the radio to produce noise. When the motorcycle is driving nearby, the TV screen appears snowflake, pick up the phone and hear the radio sound, etc. These can be referred to as "BC I" "TV I" "Tel I" , these abbreviations have the same "I" (interference) (BC: broadcast)

So which part of EMI is the EMI standard and EMI detection? Of course, the second layer of meaning, the source of interference, also includes the electromagnetic energy before being disturbed.

Followed by "electromagnetic". If the charge is stationary, it is called static electricity. When different potentials move in unison, an electrostatic discharge occurs, a current is generated, and a magnetic field is generated around the current. Electromagnetic waves are generated if the direction and magnitude of the current continue to change.

Electricity exists in various states, and we collectively refer to all of these states as electromagnetic. Therefore, EMI standards and EMI testing are to determine the state of the electricity being processed, to determine how to detect, and how to evaluate.

EMS (Electro Magnetic Susceptibility) literal translation is "electromagnetic sensitivity." It is intended to mean the ease with which performance is degraded due to electromagnetic energy. To be easy to understand, we like to compare electronic devices to humans, and compare electromagnetic energy to a cold virus. The sensitivity is whether it is susceptible to a cold. If it is not easy to catch a cold, it means that the immunity is strong, that is, the English word Immunity, that is, strong anti-electromagnetic interference.

EMC (Electro Magnetic Compatibility) literal translation is "electromagnetic compatibility." It means that the electromagnetic energy generated by the equipment does not interfere with other equipment or the electromagnetic energy of other equipment.

The term EMC has its very broad meaning. As blind people touch, you feel very different from reality. In particular, electromagnetic phenomena that are contrary to the design intent should be considered as EMC problems.

Electromagnetic energy detection, anti-electromagnetic interference test, statistical processing of test results, electromagnetic energy radiation suppression technology, natural electromagnetic phenomena such as lightning and geomagnetism, influence of electric field magnetic field on human body, international standard of electric field strength, transmission path of electromagnetic energy, Relevant standards and restrictions are included in EMC.

Can further explain:

When we watch TV, if someone is using a hair dryer or an electric shaver, there will be annoying snowflake stripes on the screen. The rice cooker cooks the uncooked rice, and the air conditioner that has been turned off is turned off. After a while, it starts up again... These are common electromagnetic interference phenomena. More seriously, if the electromagnetic interference signal interferes with the medical electronic device that is monitoring the condition or the aircraft that is flying, it will have unimaginable consequences.

Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate in its electromagnetic environment and to produce unacceptable electromagnetic interference to any device in its environment. Therefore, EMC includes two requirements: on the one hand, the electromagnetic interference generated by the equipment in the normal operation process cannot exceed a certain limit; on the other hand, the appliance has certain electromagnetic interference in the environment. The degree of immunity, ie electromagnetic sensitivity.

Electromagnetic interference is any electromagnetic phenomenon that degrades the performance of a device or system. The so-called electromagnetic interference refers to the performance degradation of equipment or systems caused by electromagnetic interference. It is customary to say that EMC includes both EMI (electromagnetic interference) and EMS (electromagnetic sensitivity).

With the development of electrical and electronic technology, household appliances have become increasingly popular and electronic, radio and television, postal and telecommunications, and computers and their networks have become increasingly developed. The electromagnetic environment has become increasingly complex and deteriorating. Electromagnetic compatibility of electrical and electronic products is increasingly being accepted by countries. The government and production companies attach importance. Since the European Community stipulated that the electrical and electronic products must be affixed with the CE mark in 1996 to be sold in the European Community market, countries have taken corresponding measures. As a domestic household appliance manufacturer, we must act as soon as possible to understand and improve the EMC performance of our products, and follow the new situation of EMC certification to achieve an active position in the market.

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