Adapter electromagnetic compatibility EMC test

　　EMC design and EMC testing are complementary. The quality of EMC design is measured by EMC testing. Only in the whole process of EMC design and development of the product, EMC compatibility prediction and evaluation can be found early. Existing electromagnetic interference, and take necessary suppression and protective measures to ensure the electromagnetic compatibility of the system. Otherwise, when the product is finalized or the system is built and the incompatibility is found, it will be necessary to spend a lot of manpower and material resources. To modify the design or adopt remedial measures.

　　EMC testing includes test methods, measuring instruments and test sites. The test methods are based on various standards, and the measuring instruments are based on the frequency domain. The test site is a prerequisite for EMC testing and an important factor to measure the level of EMC. The site has a great impact, especially the electromagnetic radiation emission, radiation reception and radiation sensitivity testing have the most stringent requirements for the site. At present, the test sites commonly used at home and abroad include open fields, semi-anechoic chambers, shielded rooms, and transverse electromagnetic wave chambers. ｡

　　There are roughly two types of EMC testing laboratories: one is a comprehensive design and testing laboratory or testing center that has been approved by EMC authority and quality system certification, and has legal testing qualifications. It includes conduction interference and conduction sensitivity. The shielding room for testing the sensitivity and electrostatic discharge sensitivity, the anechoic shielding room for the radiation sensitivity test, the open field for the radiation emission test and the fully equipped test and control equipment. The other type is based on this unit’s An EMC laboratory with certain testing functions established by actual needs and funding. Compared with testing centers, this type of testing laboratory is small in scale and low in cost. It is mainly suitable for pre-compatibility testing and EMC evaluation, which is to make products in Before the final EMC certification, there is a means of self-testing and evaluation.

　　In terms of testing instruments, the automatic detection system with spectrum analyzer as the core can quickly and accurately provide EMC-related parameters. The combination of a new type of EMC scanner and spectrum analyzer realizes the visualization of electromagnetic radiation. The device, the PCB board, the whole machine and the cable, etc. are subjected to a full range of three-dimensional tests to show the true electromagnetic radiation status

　　The EMC test must be carried out in accordance with the test method given by the EMC standard and specification, and the limit value specified by the standard is used as the criterion. For the pre-compliance test, although it is impossible to ensure that the product passes the standard test of all items, it can at least eliminate Part of the electromagnetic interference, thereby improving the credibility of the product, and can point out how to improve the design and suppress EMI emission.

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