Q: What is EMI? What is the difference between EMS and EMC?

Answer: There are many English abbreviations in the field of electrical interference. The EMI (Electro Magne TIc Interference) literary translation here is electromagnetic interference. This is a compound word, we should consider "electromagnetic" and "interference" separately.

The so-called "interference" refers to the two layers of meaning that the performance of the device is reduced after interference 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" and "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.

What is the difference between EMS and EMC?

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 Magne TIc 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.

Q: There have been a lot of things with the term interference recently. What is interference?

A: The concept of “interference” has been used more and more recently, and it corresponds to what must exist. Anything that is not desirable can be called “interference”.

Specific to "electromagnetic interference", it can be divided according to the seven categories listed below:

According to the source of the division

According to the propagation path

According to the cause of radiation interference

According to the working principle of different devices

Divided by frequency of occurrence

Divided by frequency range

Different AC power supplies

The ways of interference propagation are “conducted interference” transmitted through power lines, signal lines, ground lines, earth, etc., and “space interference” directly transmitted through space.

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