基于标准表法的精密数字测温仪校准方法

High Accuracy Temperature Indicators Calibration by Master Meter Method

参考流量与电学计量领域利用标准表对仪器进行校准的方法,提出一种采用高精度的测温电桥与高稳定性的直流电阻箱组合作为标准装置,校准精密数字测温仪的方法。用此方法对精密数字测温仪进行校准并进行测量不确定度分析,结果表明在-195~660℃氛围内,温度示值误差的合成标准不确定度为0.5~0.7 mK。此方法采用的标准器准确度比现有的校准方法更高,并可以在更广的环境温度范围内应用。

A method of calibrating high accuracy temperature indicators using the combination of DC comparator bridges for measuring temperatures and DC resistance box as the standard device was proposed,which referred to the method of calibrating the instrument using master meter method in the field of flow and electrical measurement.The method was used to calibrate a high accuracy temperature indicator,and the measurement uncertainty was analyzed.The calibration results showed that the combined standard uncertainty of temperature indication deviation was 0.5~0.7 mK in the range of-195℃to 660℃.The accuracy of the standard instrument used in this method was higher than that of other existing calibration methods,and it could also be applied in a wider range of ambient temperature.