Evaluation of the measurement uncertainty in thermoresistances calibration

Abstract

The paper refers to evaluation of measurement uncertainty in calibration of thermoresistances The evaluation of measurement uncertainty in the calibration of thermoresistances is necessary in order to make accurate measurements and to understand the use of measurement results. It is also important to evaluate the calibration uncertainty as part of the calibration for the purpose of mentioning it in the calibration certificate of the thermoresistance. Calibration determines the correspondence between the input and output signal of a temperature sensor. In this case, the calibration of the thermoresistance determine a dependency relationship between the input signal, electrical resistance ($\Omega$), and the output signal, temperature °C. A practical method for calibration thermometers with electrical resistance is using calibrators temperature or thermostatic baths, which consists of measuring the electrical resistance of the calibrated thermometer with electrical resistance, and temperature of the working medium in which the calibrated and standard thermometers are immersed, at set point temperature. All the individual uncertainty components of thermoresistance calibration should have predefined values and provide for the total extended measurement uncertainty a smaller value.