This paper introduces jobbing principle aad constitution of automatic fast harmless testing device of hardness of tie rod stud for auto-engine, which consists of Z80-CPU STD bus system.

• 介绍了由Z-80CPU STD总线系统组成的汽车发动机连杆螺栓硬度自动快速无损检测装置的工作原理与基本结构。