由于历史发展的原因 ,我国铁路机车信号制式现有移频、交流计数及 2 5Hz交流计数叠加移频等几种。区间信号机也由最早的三显示发展为四显示 ,甚至多显示模式。因而在电务段检修、测试工作中 ,迫切需要一种能适应各种制式 ,又能产生各种码型的通用式检测设备 ,并要求该设备具有 Due to the historical development, the existing railway locomotive signaling system frequency shift, AC count and 25Hz AC count overlay frequency shift and other several. Range signal from the earliest three shows the development of four displays, and even multi-display mode. Therefore, in the maintenance and test work of the electric service department, there is an urgent need for a general-purpose testing equipment that can adapt to various standards and generate various code types, and requires the equipment to have