Abstract The coupling-decoupling network (CDN) is widely applied in electromagnetic compatibility (EMC) for conducted radio frequency susceptibility tests. The impedance of equipment under test (EUT) port is the most important parameters in CDN calibration. To measure the impedance, adapters are required to connect the vector network analyzer (VNA) to the EUT port of the CDN. Until now, the impact of the adapters used has not been clearly demonstrated by the domestic calibration laboratories, while the impedance errors at high frequencies are caused by the adapters. Therefore, basing on experimental and theoretically calculating principles, two methods, which are defined as self calibration of VNA after coaxially converting and calculation by electrical length compensation, have been presented. The data indicate that the two methods are valid for removing the adpaters' impact, and the impedance measurement results have be improved.
ZHAO Pin-zhang. The Impact of the Adapters on Impedance Measurement of EMC RF Conducted Coupling-Decoupling Network[J]. Acta Metrologica Sinica, 2019, 40(4): 704-707.
［1］张音,刘柏吉.电源端口传导骚扰电压测量不确定度的评定［J］. 计量学报,2007,28(4):404-407.
Zhang Y, Liu B J. Evaluation of Uncertainty in Measurement of Mains-borne Terminal Conducting Disturbance Voltage［J］. Acta Metrologica Sinica, 2007,28(4):404-407.
［2］国家质量监督检验检疫总局.GB/T 17626.6—2008电磁兼容 试验和测量技术 射频场感应的传导骚扰抗扰度 ［S］.2008.
［3］IEC 61000-4-6: 2013 Electromagnetic compatibility (EMC)—Part 4-6: Testing and measurement techniques-Immunity to conducted disturbances, induced by radio-frequency fields ［S］.2013.
［4］洪力,武彤. 耦合去耦网络的校准方法研究［C］//全国电子测控工程学术年会.福州,2002.
Hong L, Wu T. Research of calibration method for CDN［C］// National electronic measurement and control Engineering academic annual meeting. Fuzhou,2002.
［5］杨金涛,尹伟佳.传导骚扰抗扰度耦合/去耦网络的校准［J］. 安全与电磁兼容, 2009,(3):41-44.
Yang J T, Yin W J. Calibration for coupling/decoupling networks in measuring system of immunity to conducted disturbances［J］.Safety & EMC,2009,(3):41-44.
［6］Keysight Technologies. Impedance Measurement Handbook, A Guide to Measurement Technology and Techniques ［M］.5th ed. USA: Keysight Technologies, 2015.
2019, Vol. 40 
