电磁辐射敏感度混响室量化测试方法

The Quantification Test Method of Electromagnetic Radiation Susceptibility for Equipment Under Test in Reverberation Chamber

针对混响室环境电磁辐射敏感度定量测试的技术需求,分析了现有测试方法的局限性,指出了存在的问题.从混响室电磁场统计分布规律和电磁辐射效应机理出发,建立了受试设备(EUT)临界干扰场强与混响室测试环境电场强度有效均值、EUT受扰概率和等效天线方向性系数最大值之间的关系.统筹考虑效应类型、等效天线耦合效率等因素,从用频设备干扰与损伤效应、强场电磁辐射效应和测控设备扰动效应等3方面,给出了EUT等效天线方向性系数的选取原则和拟合公式.测试过程中使EUT的干扰概率保持在10%~60%、混响室搅拌位置数在30~50时,混响室与均匀场环境中EUT临界干扰场强测试结果之间的误差在3 dB左右.某型军用超短波通信电台带外强场电磁辐射关机-重启效应、电源模块测控扰动效应临界干扰场强测试结果表明:混响室与均匀场环境EUT的电磁辐射临界干扰场强测试值随辐射频率的变化规律一致,二者之间的最大测试误差为5 dB,能够满足工程测试需求.

Aiming at the technical requirements for the quantitative test of the electromagnetic radiation susceptibility in reverberation chambers,the limitation of the existing testing methods was analyzed and the key problems were pointed out.Based on the statistical distribution rules of the electromagnetic field in reverberation chamber and the electromagnetic radiation effect mechanism,the relationship between the critical interference field intensity of the equipment under test(EUT)and the effective mean value of the electric field intensity in reverberation chamber,the interference probability of the EUT and the maximum value of the equivalent antenna directivity factor was established.Considering the effect types and the coupling efficiency of the equivalent antenna,the selection principle and the fitting formula of the directivity factor of the EUT equivalent antenna were presented in three aspects,the interference and damage effect for the spectrum-dependent equipment,the high intensity electromagnetic radiation effect for EUT and the disturbance effect for the measurement and control equipment.A test was arranged with the condition,10%~60%interference probability of the EUT and the stirring position number 30~50 in the reverberation chamber.The test results show that the result error of the EUT critical interference field intensity between the reverberation chamber environment and the uniform field environment is about 3 dB.A military ultra-short wave communication radio was selected as EUT to test the out-band high intensity radiation shutdown-restart effects and the measurement control disturbance effects of the power module.The test results indicate that the rule of the electromagnetic radiation critical interference field intensity varies with the radiation frequency for EUT,it is the same between the reverberation chamber and the uniform field environment.The maximum test error value is 5 dB,which can satisfy the requirements of the engineering test.