大型医疗设备辐射发射现场测试场地验证技术研究

Research on the Verification Technology of Radiation Emission of Test Site for Large Medical Equipment

大型医疗设备电磁兼容现场测试的辐射发射项目因场地差异较大存在不确定度高、复现性差的问题,有效的场地验证是解决此问题的一种措施。该文从归一化场地衰减(NSA)出发,应用使用宽带天线的开阔场和半电波暗室的NSA法基本原理,结合现场测试的实际情况进行转化,构建了一种适用于普通电磁兼容检测实验室的现场测试场地验证的测试方法,并在实验室已有的三米法电波暗室进行验证,及在实际现场测试场地进行测量实践。

The radiation emission testing of site test of large medical equipment faces issues of high uncertainty and poor reproducibility caused by significant site differences,necessitating site verification.Starting from the NSA,the NSA method with broadband antennas is used.Combining with the actual situation of site test,a test method for site verification suitable for common EMC testing laboratories is realized.The verification is carried out in the existing 3-meter semi-anechoic chamber,and the measurement practice is carried out in the actual test site.