High Accuracy Temperature Indicators Calibration by Master Meter Method

Abstract

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.