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首先,分析传导骚扰的测试原理,研究人工电源网络的电路结构,得到传导骚扰噪声的计算模型;其次,对被试设备的两种不同接地方式进行探讨,分别从线缆传导影响和空间辐射影响两方面进行分析对比;最后,提出EUT与AMN同一点共同接地的测量结果优于被试设备(equipment under test,EUT)与人工电源网络(artificial mains network,AMN)分别就近接地的情况;试验结果与分析结果具有良好的一致性,建议在标准中完善对EUT接地情况的描述。
First of all, the principle of conduction disturbance is analyzed, the circuit structure of artificial power network is studied, and the calculation model of conducted disturbance noise is obtained. Secondly, two different earthing modes of the tested equipment are discussed respectively. The effects of cable conduction and space radiation Finally, it is proposed that the measurement results of EUT and AMN common ground are better than those of equipment under test (EUT) and artificial mains network (AMN), respectively. The test results It has good consistency with the analysis results and it is suggested to improve the description of EUT grounding in the standard.