为实现自动测试系统中仪器的可互换，运用通用模块构建(CBB)思路，通过动态链接库(DLL)技术，设计与实现了可互换仪器程控命令封装库。该封装库具有品质高，通用性、实用性和可扩展性强等特点，不用修改自动测试程序而实现不同仪器之间的互换，实现了自动测试程序和仪器驱动完全分离，有利于自动测试系统的升级和移植，极大提高了自动测试系统的开发效率。

For the realization of the automatic test system of interchangeable instrument, using the Common Building Block(CBB) models, through Dynamic Link Library(DLL) technology, the interchangeable instrument command package library is designed and implemented. The package library bears the characteristics of high-quality, versatility, practicality and scalability and so on. It can achieve the interchanging between different instruments without modifying the automatic test program, and can separate the automated testing procedures from the instrument drivers completely. It is beneficial to the upgrade and migration of automatic testing system, and improves its development efficiency greatly.