Anechoic Chamber Site Field Uniformitytesting System

Radio technology is widely used in many fields at present,which is the inevitable result of its mature technology and development.However,it should be noted that in the process of integration of radio technology into various fields,the market for radio interference problems appears.Thus restricting the application of radio technology benefits.Strictly speaking,this problem can be attributed to the electromagnetic compatibility category.In this paper,as a node,citing electromagnetic compatibility test items to explore the electromagnetic compatibility test sites and anechoic chamber related indicators,based on this in accordance with the relevant standards for anechoic chamber uniformity test principle of operation,constant power law,constant Field test method,based on the calibration of alternative radiation analysis,thereby enhancing the understanding of electromagnetic compatibility testing.Anechoic anechoic site field uniformity(Field,Uniformity)indicators,the darkroom radiation immunity measurement as the entry point and access point.Its operating mechanism is: After the test equipment generates the field strength,it examines the working performance parameters of the EUT and see if there is any change.Theoretically speaking,the surface of the EUT is in the range of the range,and the height of the specific height above the floor in the quiet zone is defined as the corresponding vertical plane.The space of this illusion is called the uniform region.The change of the field in this plane is in a very small state,In the 80MHz-6GHz frequency range,it is theoretically required that more than 75% of the surface amplitude deviation in this region be within a certain range,and the range parameter is 0-+ 6dB.Then the division of the uniform area is defined as a grid of 0.5 m pitch and 16 field probes are used to test the field strength,followed by the selection of 12 values and the deletion of 4 of them,theoretically remaining Of the 12,the distance between the maximum and minimum will not be less than 6dB.Antenna directional performance must be tested in a small windowing fashion,with the same assurance that the difference between the maximum and minimum is less than 6dB and that its area is more than 75%,which defines it as uniform and long Radiated immunity testing the basic requirements.After investigating the uniformity of the anechoic site,we need to weigh the following: test principle,site layout,equipment parameters,test steps,etc.Based on this,combining with practical experience,to achieve the selection of equipment,to develop test programs to achieve Improve the construction of the test system,after the system is constructed,measure the radiation immunity of anechoic chamber.In order to explore the difference between constant power method and constant field method,summarize and summarize the advantages and disadvantages of each method,and then give the testers better opinions and suggestions to ensure that the test results move towards the more ideal direction,Test efficiency in a higher direction of pushing.