载频电平测量仪
carrier frequency level measuring setup
选频电平表
selective level meter
selective voltage and level meter
frequency selective level meter
单路载频电话终端机
single-channel carrier frequency telephone terminal
多路载频电话终端机
multichannel carrier-frequency telephone terminal
载频电报终端机
carrier frequency telegraph terminal
RF射频电平
radio-frequency signal level
选频电平指示器
frequency selective level indicator
音频电平测试仪
audio frequency level measuring equipment