中文摘要：

为了解决低压高速电力线通信（power line communication，PLC）网络电磁辐射准确测量的问题，研制一套基于球形探头的近场电场测量系统。从理论上分析球形探头的场强变换原理，设计测量系统，并获得了变换因子的表达式。研究进一步提高测量系统灵敏度的方法，设计高输入阻抗的电压跟随电路。通过大量的试验进行验证，得到了测量系统在1-30MHz频率范围内所能测量PLC网络电磁辐射场强的范围，研究表明，在现有PLC网络电磁辐射限值下，该近场电场测量系统能够满足测量要求。

英文摘要：

For accurately measuring the power line communication （PLC） networks electromagnetic radiation in near field, the measurement system based on spherical probe was developed. The transformation mechanism was analyzed in theory and the transform factor was obtained. The methods for increasing the sensitivity of the measurement system were studied and the voltage follower based on operational amplifier was designed. The measurement system was detected through a lot of tests and the approximate measurement range of electric-field strength in 1 -30 MHz bandwidth was achieved. The results show that the measurement range of electric-field strength covers the requirement of the PLC radiation.