在静力强度研究中,常需对试件的材料、模型以及整个结构作静态应力分析试验,因此,电阻应变仪作为一种应变测量仪器,在建筑,机械、水利、车辆、船舶、铁路、矿山、航天等专业的试验中有着广泛的应用。长期以来,人们都是采用直读调零式应变设备作为多点应变的测量仪器,不仅易引起测量中的过失误差,而且每级试验的测 In the study of static strength, the static stress analysis test is often required for the material, model, and the entire structure of the test piece. Therefore, the resistance strain gage is used as a strain measurement instrument in construction, machinery, water conservancy, vehicles, ships, railways, Mine, aerospace and other professional experiments have a wide range of applications. For a long time, people have used direct-reading zero-strain straining equipment as measuring instruments for multi-point strain, which not only causes errors in measurement, but also measures each level of test.