在一般工程试验中,特别是现场实测时,由于电阻应变片灵敏系数、热输出分散,环境条件苛刻等问题,往往产生较大的测量误差。为了解决这个问题,冶金工业部建筑研究总院研制成功了DY-A1型电测引伸计。这种引伸计同时兼有杠杆引伸仪和电阻应变片的特点。它的机架是传动及承担安装卡紧力的机构,通过20毫米长的第一杠杆,将变形传递到敏感元件上,并由粘贴的电阻应变片转换成电量,因而安装卡紧力对精度的影响小,稳定性好,可以重复安装使用。该引伸计能够与各种电阻应变仪配套,测定标距内的表面应变,也可作为小量程精密位移计使用。由于 In the general engineering test, especially when measured on the spot, due to the problems of resistance strain gauge sensitivity coefficient, heat output dispersion, and harsh environmental conditions, a large measurement error is often generated. In order to solve this problem, the DY-A1 electrical test extensometer was successfully developed by the Building Research Institute of the Ministry of Metallurgical Industry. This extensometer combines the characteristics of a lever extensometer and a strain gage. Its frame is the transmission and the mechanism that bears the installation clamping force. Through the first 20 mm long lever, the deformation is transmitted to the sensitive element, and the attached strain gauge is converted into electricity, so the clamping force is installed to the precision. The effect is small and the stability is good. It can be installed repeatedly. The extensometer can be matched with various resistance strain gauges to measure the surface strain within the gauge, and it can also be used as a small-range precision displacement gauge. due to