当动态电阻应变仪用于测量应变、负荷、位移时,都遇到标定问题。有时传感器的桥臂阻值或电阻片的阻值不是120Ω时,如果再用内标定就可能出现较大误差。例如做混凝土的弹性模量时,一般的电阻片标距为10公分长,阻值约为300欧姆左右,半桥测量时用内标定就会出现错误。本文就这方面问题加以理论上的解释和提出具体的标定方法。 Calibration problems have been encountered when using dynamic resistance strain gauges to measure strain, load, and displacement. Sometimes the sensor’s bridge arm resistance or resistance of the resistance is not 120Ω plate, if you use the internal calibration may be greater error. For example, the elastic modulus of concrete, the general resistance of the gauge length of 10 cm long, the resistance is about 300 ohm, half-bridge measurement with internal calibration error. This article gives a theoretical explanation of this issue and proposes a specific calibration method.