球铰式引伸计是一种新型的引伸计。它具有结构简单、制作容易、装夹方便、数据整理工作可大大简化的优点。由于工厂已经成批生产和销售,这种应变测量仪器势必会在今后获得日益广泛的应用。本文通过对球铰式引伸计本身和其使用过程中可能产生的几个误差的分析,提出了这种仪器精度的评定方法,以供有关方面的人员参考。 Ball hinge extensometer is a new type of extensometer. The utility model has the advantages of simple structure, easy manufacture, convenient installation, and greatly simplified data processing work. As the factory has been mass-produced and marketed, such strain gauges are bound to gain more and more widespread use in the future. In this paper, the ball hinged extensometer itself and its possible use of the process of analysis of several errors, proposed the accuracy of this instrument assessment method for reference of the parties concerned.