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Electromagnetic Compatibility Design of Electronic Equipment

No pulse repetition rate can also be taken as the cutoff frequency of 15 times. Insertion loss (InsertionLoss, IL) is the filter when no access lines and access line to the load after the power source to send the ratio, usually in decibels (dB) to that: children (dB) = 101g (P1/P2) (6) where P, and P: respectively, before and after the filter access lines, to pass the load from the power source. Manufacturers usually gives the insertion loss of filter data in system testing is usually obtained by 5011. In practical engineering applications, system impedance is not 5On, therefore, the choice of filter must be based on the actual circuit to consider the source impedance and load impedance insertion loss. The actual circuit insertion loss calculated by the following formula: 71L (dB) = 201g [1 +] (7) where: z represents the source impedance; Zl said load impedance; z that the transfer impedance; filter in the installation process should be Note: (1) Filter the metal shell and chassis to ensure good contact,[link widoczny dla zalogowanych], and grounding wire connected; (2) the filter input and output lines must be distance, should not parallel,[link widoczny dla zalogowanych], so as not to reduce the effectiveness of the filter ; (3) The power supply filter should be installed in the power of population at the election to reduce the input line length in the chassis, reduce the radiation interference. 3 Conclusion In general,[link widoczny dla zalogowanych], the appropriate ground can effectively reduce the demand for shielding and filtering; Similarly, appropriate shielding can also be effective in reducing the filtering requirements. In practical engineering, the grounding and shielding to be achieved more easily than the filter, so the design process should be grounding, shielding and filtering in order to consider the option of using, try not to filter Hai-Xia Chen: EMC design of electronic equipment 39 as a filter improper shielding or grounding of the supplement. EMC in the actual engineering design there are many other methods, such as rational choice circuit design and components to reduce the space the electromagnetic radiation device to increase the circuit's immunity; through the rational layout of equipment can also be effective in improving the electromagnetic compatibility ; control circuit in the computer software technology can also be used to improve system robustness. Usually in the electromagnetic compatibility of electronic equipment design work requires a combination of equipment works,[link widoczny dla zalogowanych], work environment and other factors, in advance of the equipment for electromagnetic compatibility analysis, and comprehensive application of electromagnetic compatibility design methods can achieve the desired design requirements. (Continued from page 34) 5.2.2 unknown unknown curve and surface measurement of curves and surfaces that are only in-kind, no drawings of the curves and surfaces, and more for mold and other sectors need to reverse, often referred to as reverse engineering. The unknown curve and surface to be measured, generally divided into a number of tested surface contour section, deal with a scanning probe SP600 surface scan test, if not with SP600 probe, with TP200 probe small step away from the feed, but also have measured the surface of a large number of data points, called \VDA format the computer to store, IGS can be obtained by converting the data a common format, the data input three-dimensional modeling software, the use of topology, necessary for modification of the boundary points, you can get three-dimensional model of the device under test, this is the reverse engineering . For a complex piece, to achieve the reverse engineering, surveying and mapping is very large, generally only rely on scanning probe to be completed. 6 Conclusion coordinate measuring machine is a complex and intelligent measurement systems with reference 1BernhardKeiser, Ye Zhongxiong such as translation. Electromagnetic interference and protection. World Publishing Company, 19892 Mao Nan, Sun Ying. Interference practical electronic circuit technology. National Defense Industry Press, 19963 Cairen steel. Principles of electromagnetic compatibility, design, and prediction. Beijing Aerospace University Press, 1997 Hai-Xia Chen female, born in 1974 in Lianyungang City, college, assistant engineer. He graduated from Nanjing University of Computer Application, the radar is in commissioning. System, the geometric measurement in the future will occupy a very important position, CMM will progress as the technology constantly evolving, with new features constantly. Only in the practical work continuously to understand and master its working principle, performance, in order to better expand its capabilities. References 1 National Defense Science and Technology and quality yearbook. Geometrical measurement. Atomic Energy Press, 2002,[link widoczny dla zalogowanych],92 children actually prepared. Dimensional measuring. Machinery Industry Press, 1992,43 Zhaochuan Ping. CMM and working principle of training handouts. 4, Nanjing University of Aeronautics and Astronautics, Jiangsu Province, the regional defense metering station. Coordinate measuring machine in 1995, technology exchange Proceedings, 1995 Dinghui Qin F, May 1970 students, engineers, graduated from the China Institute of Metrology, mainly in the geometric measurement of the amount of work.
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