Effectiveness evaluation of devices for AC mains cable termination control to improve reproducibility of radiated emission measurement - based on the interim results of international inter-laboratory comparison -

Specifications for the terminating condition of EUT cables leaving from test area have not been specified in any standards, although it is one of the sources of poor measurement uncertainty for the radiated emission measurement. To improve the reproducibility of a radiation emission measurement among test sites, VHF-LISN is proposed to simulate artificially AC mains network as the device for specifying the termination condition of the EUT power cable. For proposing standardization of VHF-LISN, an international inter-laboratory comparison test was proposed and it is being performed now by CISPR/SCI/WG2. Although the main purpose of the inter-laboratory comparison was to compare the result with measurement conditions of VHF-LISN and without the device, this comparison study has been performed with also including CMAD which was already standardized to a termination condition control device and CDNE which is currently planned to standardize, as the effectiveness evaluation of AC mains-cable termination control devices. From an intermediate result of the inter-laboratory comparison measurement, the standard deviation and the average value of data were summarized for two EUTs and five test conditions. As a tentative conclusion, the predominance of VHF-LISN has been confirmed with the factors analysis of cause in this paper.