screening factor meaning in Chinese

屏蔽率
屏蔽系数

Test methods for communication cable - test for ideal screening factor measured at power frequency
通信电缆试验方法工频条件下理想屏蔽系数试验
Railway fixed equipment and rolling stock . electromagnetic disturbances . determination and measurement of screening factor with a frequency of 50 hz of railway signalling and telecommunication cables
铁路固定设备和车辆.电磁干拢.铁路信号和电信电缆50赫兹频率的屏蔽系数的确定和测量