Where is the EMC energy mine

1.

Electromagnetic compatibility (EMC) refers to the ability of equipment or system to meet the requirements in its electromagnetic environment and not proce unbearable electromagnetic interference to any equipment in its environment

With the development of modern science and technology, the number and types of electrical and electronic equipment are increasing, which makes the electromagnetic environment increasingly complex. In this complex electromagnetic environment, how to rece the mutual electromagnetic disturbance and make all kinds of equipment work normally is an urgent problem to be solved; On the other hand, the bad electromagnetic environment will have a bad impact on human and ecology

extended data:

EMC includes two requirements: on the one hand, it means that the electromagnetic interference generated by the equipment to the environment in the normal operation process cannot exceed a certain limit value; On the other hand, it means that the instrument has a certain degree of immunity to the electromagnetic interference existing in the environment, that is, electromagnetic sensitivity

in recent years, with the wide application of high sensitive electronic technology in medical electrical equipment and the rapid development of new communication technologies, such as personal communication system and cellular telephone, in various fields of social life; Medical electrical equipment not only emits electromagnetic energy, which affects the radio communication business and the work of other surrounding equipment, but also may be interfered by electromagnetic energy emission from surrounding equipment such as communication equipment in its application environment, causing harm to patients

filter connector is often of great help to the EMC performance of procts, but its cost is relatively high. Generally, when the problem can be solved by using on-board filtering, cable shielding and other methods, filter connector is not used. Filter connectors are usually used in some special situations, such as strict military standard requirements, small batch applications in harsh instrial environment and some special situations (such as structure size restrictions)

the research of EMC theory and technology in China started relatively late, and its development in the medical field only started in the 1990s. In 1995, China issued GB 9706.1-1995 General requirements for safety of medical electrical equipment. It was not until April 5, 2005 that the former State Food and Drug Administration issued the mandatory instry standard for medical devices YY0505-2005 Medical electrical equipment Part 1-2: General requirements for Safety - parallel standards: electromagnetic compatibility - Requirements and tests

References: EMC network

2.

electromagnetic environment

the sum of all electromagnetic phenomena existing in a given place

electromagnetic disturbance

any electromagnetic phenomenon that may cause performance degradation of devices, equipment or systems or damage to living or non living substances

electromagnetic interference (EMI)

the performance degradation of equipment, transmission channel or system caused by electromagnetic interference

radiated emission (RE) and concted emission (CE)

re: useful or unwanted electromagnetic energy transmitted through space. CE: electromagnetic emission transmitted along power supply or signal line

electromagnetic susceptibility (EMS)

the undesirable response of equipment exposed to electromagnetic environment. Radiation sensitivity CS and conction sensitivity CS

transient

a physical quantity or phenomenon that changes between two adjacent states, and its change time is less than the time scale concerned

3. The full name of EMC (electromagnetic compatibility) is electric magnetic compatibility, which is defined as "the ability of equipment and system to work normally in their electromagnetic environment without causing unbearable electromagnetic disturbance to anything in the environment". The definition includes two aspects. First, the equipment should be able to work normally in a certain electromagnetic environment, That is, the equipment should have certain electromagnetic immunity (EMS); Secondly, the electromagnetic interference generated by the device itself can not have too much impact on other electronic procts, namely electromagnetic interference (EMI)

with the development of modern science and technology, the number and types of electrical and electronic equipment are increasing, which makes the electromagnetic environment increasingly complex. In this complex electromagnetic environment, how to rece the mutual electromagnetic disturbance and make all kinds of equipment work normally is an urgent problem to be solved; On the other hand, the bad electromagnetic environment will have a bad impact on human and ecology

with the development of electrical and electronic technology, the popularization and electronization of household appliances, the development of radio and television, posts and telecommunications and computer networks, and the increasingly complex and deteriorating electromagnetic environment, the electromagnetic compatibility (EMC, EMI and EMS) of electrical and electronic procts has been paid more and more attention by governments and manufacturers. Electromagnetic compatibility (EMC) of electronic and electrical procts is a very important quality index, which is not only related to the reliability and safety of the proct itself, but also may affect the normal work of other equipment and systems, as well as the protection of electromagnetic environment

in order to standardize the EMC of electronic procts, all developed countries and some developing countries have formulated EMC standards. EMC standard is the basic requirement for procts to work normally in the actual electromagnetic environment. That is to say, even if the proct meets the EMC standard, interference may occur in actual use. Most of the national standards are based on the International Electrotechnical Commission (IEC) standards

EMC includes two requirements: on the one hand, the electromagnetic interference generated by the equipment to the environment in the normal operation process should not exceed a certain limit value; On the other hand, it means that the instrument has a certain degree of immunity to the electromagnetic interference existing in the environment, that is, electromagnetic sensitivity

in recent years, with the wide application of high sensitive electronic technology in medical electrical equipment and the rapid development of new communication technologies, such as personal communication system, cellular phone, etc., in various fields of social life; Medical electrical equipment not only emits electromagnetic energy, which affects the radio communication business and the work of other surrounding equipment, but also may be interfered by electromagnetic energy emission from surrounding equipment such as communication equipment in its application environment, causing harm to patients.

4. Electromagnetic compatibility (EMC) refers to the ability of equipment or system to meet the requirements in its electromagnetic environment and not proce unbearable electromagnetic interference to any equipment in its environment. Therefore, EMC includes two requirements: on the one hand, it means that the electromagnetic interference generated by the equipment in the normal operation process cannot exceed a certain limit value; On the other hand, it means that the instrument has a certain degree of immunity to the electromagnetic interference existing in the environment, that is, electromagnetic sensitivity.

5.

electromagnetic environment

the sum of all electromagnetic phenomena existing in a given place

electromagnetic disturbance

any electromagnetic phenomenon that may cause performance degradation of devices, equipment or systems or damage to living or non living substances

electromagnetic interference (EMI)

the performance degradation of equipment, transmission channel or system caused by electromagnetic interference

radiated emission (RE) and concted emission (CE)

re: useful or unwanted electromagnetic energy transmitted through space. CE: electromagnetic emission transmitted along power supply or signal line

electromagnetic susceptibility (EMS)

the undesirable response of equipment exposed to electromagnetic environment. Radiation sensitivity CS and conction sensitivity CS

transient

a physical quantity or phenomenon that changes between two adjacent states, and its change time is less than the time scale concerned

6.

electromagnetic environment

the sum of all electromagnetic phenomena existing in a given place

electromagnetic disturbance

any electromagnetic phenomenon that may cause performance degradation of devices, equipment or systems or damage to living or non living substances

electromagnetic interference (EMI)

the performance degradation of equipment, transmission channel or system caused by electromagnetic interference

radiated emission (RE) and concted emission (CE)

re: useful or unwanted electromagnetic energy transmitted through space. CE: electromagnetic emission transmitted along power supply or signal line

electromagnetic susceptibility (EMS)

the undesirable response of equipment exposed to electromagnetic environment. Radiation sensitivity CS and conction sensitivity CS

transient

a physical quantity or phenomenon that changes between two adjacent states, and its change time is less than the time scale concerned

7. " Energy & quot; The meaning in Physics:
energy is a quantity describing a system or a process in physics. The energy of a system can be defined as the sum of the work from a defined zero energy state to the current state of the system, It changes with the description of this system. In the process of human life activities, all life activities need energy, such as the synthetic reaction of material metabolism, muscle contraction, gland secretion and so on. These energy mainly comes from food. The nutrients in animal and plant foods can be divided into five categories: carbohydrates, lipids, proteins, minerals and vitamins, Among them, carbohydrate, fat and protein can release energy through oxidation in the body. They are collectively referred to as "proctivity nutrients" or "heat source substance". "Energy is an objective existence, and everything in nature is its manifestation. Just as matter has antimatter, it also has relative counter energy. When they meet, the system will return to calm, Generally, the average metabolic capacity of carbohydrate, fat and protein per gram in the human body is 4kcal, 9kcal and 4lcal respectively. At the same time, generally, a person's energy intake in 5-7 days is equal to the consumption
excess energy intake will be stored in the body. The form of energy storage in the human body is fat, The abnormal accumulation of fat in the body will lead to obesity and unnecessary burden on the body, and can become a risk factor for cardiovascular disease, some cancers, diabetes and other degenerative diseases.
the body is short of daily intake of energy, and the body will use its own energy reserves or even consume its own tissues to meet the energy needs of life activities, In a certain period of time, there will be a decrease in basic metabolism, physical activity and weight loss, so as to rece energy consumption and make the body adapt to energy intake. At this time, energy metabolism will reach a new low level balance from a negative balance, For example, we can observe the energy of a solid with a mass of 1kg:
if we are studying classical mechanics and only interested in its kinetic energy, Then its energy is the sum of the work that we need to accelerate it from rest to its present speed.
if we are only interested in its internal energy while studying heat, Then its energy is the sum of the work we need to heat it from absolute zero to its present temperature.
if we are only interested in the chemical energy contained in it while studying physical chemistry, Then its energy is the sum of the work we add to the raw materials when we synthesize this solid.
if we are only interested in the atomic energy contained in it while studying atomic physics, then its energy is the work we do to it from the state of zero atomic energy We can also define the energy contained in the solid by using the reverse method, for example:
the internal energy of the solid is the sum of the work released by cooling it to absolute zero.
the primary energy of the solid is the sum of the work released by all the atomic energy contained in it.
it can be seen that the internal energy of the solid is the sum of the work released by cooling it to absolute zero, Although energy is a very common and basic physical concept, it is also a very abstract and difficult to define physical concept. In fact, physicists did not really understand the concept of energy until the middle of the 19th century. Before that, energy was often mixed with the concepts of force, momentum and so on Energy is a concept very similar to energy, which means a force to make an object lively (move and heat) εν In the middle of, εργο S means "work and labor". Together, en ergi means "added work"

8. Chinese Name: electromagnetic compatibility English Name: electromagnetic compatibility; EMC definition 1: equipment, subsystem and system can perform their respective functions together in a common electromagnetic environment. That is, the equipment, subsystem and system will not suffer or suffer from the performance degradation e to the electromagnetic emission of other equipment in the same electromagnetic environment; It will not make other equipment, subsystem and system in the same electromagnetic environment suffer or suffer from the performance degradation that is not allowed e to its electromagnetic emission.

9.

1. Different properties: EMI is the interference phenomenon caused by the interaction of electromagnetic wave and electronic components. EMS is the ease of performance degradation e to electromagnetic energy. EMC is the ability that the electromagnetic energy generated by the equipment does not interfere with other equipment, nor is it interfered by the electromagnetic energy of other equipment

Different purposes: the purpose of EMI is to detect the interference of electronic and electrical procts. The purpose of EMS is to detect the safety of proct quality, personal and environmental protection. The purpose of EMC is to detect the impact of electromagnetic radiation generated by electrical procts on human body, power grid in public places and other normal electrical procts

Different characteristics: EMI is a common problem in electronic and electrical procts. There are concted interference and radiated interference. EMS is one of the most important indicators of proct quality. Safety involves personal and property, while electromagnetic compatibility involves personal and environmental protection. EMC test is one of the most important indicators of proct quality. EMC measurement consists of test site and test instrument

extended data:

precautions:

1. When the working frequency is lower than 1MHz, the noise is generally caused by electric field or magnetic field (interference caused by magnetic field is generally within a few hundred Hertz), and above 1MHz, electromagnetic interference is considered. The shielding entity on the single board includes transformer, sensor, amplifier, DC / DC mole, etc. The larger one involves the shielding between boards, subracks and racks

The shielding body is not required to be closed for electrostatic shielding, as long as high conctivity material and two grounding points are required. Electromagnetic shielding does not require grounding, but requires that the inced current has a path on it, so it must be closed. Magnetic shielding requires high permeability material as a closed shield

In order to eliminate the magnetic flux proced by eddy current and interference and achieve the purpose of absorption, the thickness of material is required. At high frequency, the three can be unified, that is, sealed with high conctivity materials (such as copper) and grounded

For low frequency and high conctivity materials, the absorption attenuation is reced, and the magnetic field shielding effect is not good, so high permeability materials (such as galvanized iron) should be used

10. EMC is the abbreviation of electromagnetic compatibility. Bernhard Keiser, an American scholar, once defined EMC as: "electrical and electronic devices are said to be electrically compatible when the electrical noise generated by each does not interfere with the normal performance of any of the others, EMC is defined similarly by the International Electrotechnical Commission (IEC), the dictionary of defense and related terms published by the US Department of defense, and the IEEE Dictionary of electrical and electronic terms jointly published by the American National Standards Institute and the American Institute of Electrotechnics and electronics. According to the above definition, many domestic scholars translate EMC as electromagnetic compatibility. However, as mentioned in the foreword, the scope of EMC subject is expanding day by day, which is not only limited to electronic equipment itself, but also involves a series of ecological effects such as electromagnetic pollution and electromagnetic starvation, as well as other problems in many aspects. The term "electromagnetic compatibility" seems to be unable to cover all the contents of EMC subject. The definition of EMC in Japanese literature is as follows: "EMC is an independent subject. With the development of electromagnetic energy utilization, it will study: guessing and controlling the changing electromagnetic environment around the earth and celestial bodies, the control methods adopted to coordinate the environment, the formulation of various electrical regulations, the coordination of electromagnetic environment and the rational application of electromagnetic energy." It is because this subject covers a wide range of basic scientific theories, including engineering, natural science, medicine, economics, sociology and so on, and its theoretical system also has certain particularity, so this subject is sometimes called environmental electromagnetism
the history of environmental electromagnetism can be traced back to the 19th century. The earliest phenomenon of electrical interference is the crosstalk between single wire telegrams. In 1881, he wrote an article on interference, which can be regarded as the most important early literature. However, this kind of interference phenomenon did not attract the attention of the jammer and the jammed at that time. With the emergence of electrical transportation, there was a long equal operation between a communication line and an asymmetric strong wire, and the interference problem became more and more serious. In 1887, the Berlin Electrical Association established all the interference problems Committee, with members such as Helmholtz and Siemens. Then the British Post and Telecommunications Department studied the problem of communication interference in 1889. Electric world magazine also published articles on electromagnetic inction. In the early 20th century, Sommerfeld made outstanding research in this field. Since then, the research on the influence of electromagnetic inction has become more and more in-depth, among which the work of polacek, Karlsson, Haberland, Suntech, cleuway, Colette, Weite, koschenko, Mikhailov, Razumov and other scholars are outstanding. Up to now, this kind of interference is still the main research topic of the fifth and sixth research groups of ITU in each research period.