数显式拉力试验机只有力--时间，微机控制拉力机软件有六种试验曲线，分别是力—时间、变形—时间、位移—时间、力—变形(新标准称为力—延伸)、力—位移、应力—应变(新标准称为应力—延伸率)。
Digital tension tester has only force-time. The software of tension tester controlled by computer has six kinds of test curves: force-time, deformation-time, displacement-time, force-deformation (force-extension), force-displacement and stress-strain (stress-elongation).
绘制试验曲线是为了更方便地对材料的力学性能特征点(如上、下屈服强度、规定塑性延伸强度等)进行分析。试验曲线中的任意一点的力、位移、变形或时间，必须与数据库一一对应，不得有误，更不能造假。
The purpose of drawing test curves is to analyze the mechanical properties of materials more conveniently, such as yield strength, plastic elongation strength and so on. The force, displacement, deformation or time at any point in the test curve must correspond to the database one by one, and there must be no errors or falsification.