在《Inside AutoCAD Release13 for Windows and Windows NT》这本书里说:Setting the dimension variable DIMSCALE to 0 forces AutoCAD to automatically use the inverse of the XP scale factor of the current floating viewport as you draw dimensions in model space. This enables dimension text and arrowheads to appear uniform in size from viewport to viewport.
翻译成中文意思是:将尺寸标注变量DIMSCALE设置为0会强迫AutoCAD自动应用当前浮动视区XP比例因子的倒数作为用户在模型空间中画尺寸线的比例。这可以使尺寸线标注以及箭头在各个视图中是统一的。