Very high frequency (VHF)-line impedance stabilization network (VHF-LISN), which is defined as the termination device for mains cable of equipment under test to specify the input impedance of each line at the mains power supply outlet, can improve correlation between test sites that perform radiated emission measurement. Balanced and unbalanced types of VHF-LISN are currently under proposal with International Special Committee on Radio Interference (CISPR) as a device for prescribing the terminating condition of the power supply cable. Simulation analysis with common mode (CM)/differential mode (DM) signal sources was performed to investigate the emission characteristics with the two types of termination devices under several measurement arrangements that used two-wire and three-wire mains cables. Furthermore, to confirm the validity of the simulation analysis, measurement of a versatile comb-generator-operated by ac mains was performed under the same test arrangement and two types of termination devices. Quasi CM/DM signal from an ac-operated comb generator was injected back into the mains cable of the same comb generator. This article explains how we ascertained the radiated emission characteristics with each termination device, and provides guidance for their appropriate usage.

中文翻译：

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对不同干扰源辐射发射测量电源电缆端接条件的考虑

甚高频（VHF）-线路阻抗稳定网络（VHF-LISN），它被定义为被测设备电源电缆的端接装置，用于指定电源插座处每条线路的输入阻抗，可以提高执行辐射发射测量的测试站点。目前，国际无线电干扰特别委员会 (CISPR) 正在提议平衡和非平衡类型的 VHF-LISN 作为规定电源电缆端接条件的设备。使用共模 (CM)/差模 (DM) 信号源进行仿真分析，以研究两种类型的终端设备在使用两线和三线电源电缆的几种测量安排下的发射特性。此外，为了确认模拟分析的有效性，在相同的测试布置和两种类型的终端设备下对由交流电源供电的多功能梳状发电机进行了测量。来自交流操作的梳状发生器的准 CM/DM 信号被注入回同一梳状发生器的电源电缆中。本文解释了我们如何确定每个终端设备的辐射发射特性，并为其正确使用提供指导。