A little signal conversion plug -in components for automatic test system

The utility model relates to an electric power system relay protection tests field, concretely relates to a little signal conversion plug -in components for automatic test system. Little signal conversion plug -in components replace tradition interchange plug -in components and are applied to automatic test system, and return circuit, the quantity and the concrete configuration as required of dividing into groups of simultaneous input terminal are protected through adopting of little signal conversion plug -in components direct access protection device to the small -signal of the tester that will digitize output. The utility model discloses a digital tester of usefulness is applyed the conventional device analog quantity, has improved efficiency of software testing. Make up little signal conversion plug -in components and protection device through the fixed component simultaneously, simple structure easily operates, subsequent maintenance of also being convenient for. 本实用新型涉及电力系统继电保护测试领域，具体涉及种用于自动测试系统的小信号转换插件