EMC Chamber Performance Testing Technology

With the development of electronic and computer technology,more and more electrical equipments are used in one system,the electrical connection of these devices have become increasingly complex, that leads electromagnetic compatibility(EMC) issues have become increasingly prominent, and therefore causes people pay more attention to the electromagnetic compatibility of the electronic product. The electromagnetic compatibility test is to test electronic equipment emission and immunity whether accord with the relevant standard requirements. Anechoic chamber for electromagnetic compatibility testing is a test of recognition and long-term use of international standards can be used for electromagnetic emission and immunity test. In general, anechoic chamber can be categorized semi-anechoic chamber and fully anechoic chamber, the size of anechoic chamber are3m,5m and10m. The semi-anechoic chamber is to simulate the open area test site(OATS), and fully anechoic chamber is to simulate the free space.This article discussed in-depth and investigated the anechoic chamber performance tests of several key technical indicators, field calibration test methods. The test performance of the anechoic chamber shielding effectiveness (SE), normalized site attenuation (NSA), the transmission loss and field uniformity (FU), the transmission loss has been instead by the venue standing wave ratio (SVSWR). Delphi programming language is used in the program implementation process, all module in the program design process needs to cooperate with each other to achieve the reasonableness and accuracy of the entire testing process. Testers may use different instruments in different testing process, the test system can be applied to different manufacturers, different models of instruments.Automatic test system designed for each project to test and need to save data, graphics and printing capabilities. To FU actual test example describes the testing process, and export data of the test results, which verifies the validity of the test software. FU test, for the high frequency band, we use the alternative irradiation small window method to test, in this article details these content.