With a 4 layers model, IEEE Std 1641 - 2010 provides the capability to describe and control signals, but not include one of the most important signal, bus signals. After researching way of bus signals extension in C/ATLAS, this paper gives an model of bus instruments using the reference of its designing idea, and accomplish bus signals extension by extending new signals. It also gives TPL statement of new signals. Using this method, it fulfill test well in an ATS.%IEEE Std 1641-2010中提出STD四层结构模型,完成信号的描述和控制功能,但没有提供总线信号定义和描述,而总线信号则是自动测试中最重要信号之一;针对此问题,文中通过深入研究C/ATLAS中总线类信号的扩展方法,借鉴其设计思想,提出了满足IEEE Std 1641设计思想和原则的总线信号仪器模型,通过扩展新信号的方法完成多种总线信号扩展,并给出其TPL语言支持,经实际系统中使用,很好地完成了测试测量功能.
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