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The significance of electromagnetic compatibility testing

Release time:

2022-10-25 14:16

Source:

Electromagnetic waves through induction coupling with the control circuit of the electric detonator, the formation of interference currents may cause the explosion of the electric detonator. Therefore, GJB786 in the provisions of the electric detonator wire electromagnetic interference induced current and voltage must be less than the maximum non-firing current and voltage of 15%. In addition, a variety of fuel in the role of strong electromagnetic fields (direct irradiation, electric sparks, electrostatic discharge) there is a risk of combustion and explosion; electromagnetic energy through the physical and chemical effects on human tissue can produce harmful physiological effects. Therefore, in order to personal and the safety of certain special materials, GJB786 also provides that the amount of electromagnetic radiation from electronic devices continuous wave average power density is not allowed to exceed 4mW/cm2. pulse wave average power density is not allowed to exceed 2mW/cm2.

The electromagnetic pulse generated by the nuclear explosion, the speed of light to the outside radiation propagation, the electric field strength of up to 105V / m, magnetic field strength of up to 260A / m, pulse width of 20ns order of magnitude, the peak frequency of the electromagnetic pulse at 105Hz. this electromagnetic pulse on electronic equipment, the lighter the deterioration of electronic equipment performance, the heavier the damage caused by circuit components.

Especially in today's and future warfare, the EMP bombs that have been applied and the high-power microwave weapons that are being developed have EMP radiation similar to that generated by nuclear explosions, which will pose a deadly threat to electronic equipment. And EMC can provide the basic technical guidance to combat this threat.

Electronic products must pass the EMC test, this is certain, then the personnel engaged in the development of electronic products, must deeply understand all aspects of EMC, such as: various tests and test standards, the principle of EMC, etc., in order to design electronic products in line with EMC.

In today's society, competition is stimulating, the earlier the EMC is involved, the better it is for the technicians engaged in electronic product R&D. Undoubtedly, the most suitable time to involve, understand and master EMC is at university, where the theory combined with the practice will help students learn EMC with half the effort. At present, there are very few universities in the country that are specialized in EMC, so the earlier the study of EMC is carried out, the more beneficial it is for students to engage in the R&D of electronic products after graduation.

Facing the challenges, we need to adopt EMC system design countermeasures, pay attention to the product from the design stage, consider all aspects of the principle, PCB structure, cables, shielding, filtering, software, etc., and implement EMC management of the whole product process.

EMC characteristics have become one of the most important quality indicators of products. It is not easy to design electronic products that meet modern EMC requirements at one time. But if we can consider EMC design early in the whole process of design, it will not only help to reduce repeated tests and rework, but also save a lot of development cost and bring the product to market earlier.

The success of EMC requires us to understand the market standards, EMC test methods, EMI generation principles and suppression techniques. Through scientific management methods, advanced and applicable instruments and equipment, and collaborative work of designers, EMC design is integrated into all stages of the product development process, so that all personnel within the project can recognize clearly all kinds of EMI formation mechanisms and give full revelation and understanding of EMI formation principles, characteristics, and suppression means. This is the foundation of EMC work. Enterprises should develop design process documents for engineers and let engineers design products strictly according to product EMC design rules. In the whole process of product development and maintenance, the project leader should play the role of overall coordination, review and control in EMC of the product, grasp the EMC characteristics of the product in time and adjust the strategy when needed. It can not only ensure the good EMC characteristics of the products, but also reduce the comprehensive cost of the products as much as possible. Advanced design and evaluation tools are very important foundation for comprehensive and scientific EMC management.

Century Wisdom (Suzhou) Testing Technology Co., Ltd

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