交流干线 meaning in English

alternating-current main

This instrument can meter the electric level , frequency spectrum , carry to noise ratio , a / v , cobbly ratio , voltages of the ac trunk line and the battery . furthermore it can display the above information on the lcd and store them in the eprom
该场强仪可以对有线电视系统的电平、频谱、载噪比、 a v比、系统不平度、交流干线和电池电压等进行测量，并通过液晶显示，结果保存于eprom中。