Determining the Temperature Coefficient of Reference Resistors

TEMPMEKO 2016
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Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 12th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science

Abstract

The influence of temperature on electrical resistance of standard resistors is presented within this paper. Electrical resistance is like any other quantity temperature dependent. This dependence is specified with the temperature coefficient, which gives the relative change of resistance with temperature. The level of resistance change is not linear as it changes with temperature, and therefore the coefficient is temperature dependent as well. At a certain temperature, its value is equal to zero—the stationary point. Use of the standard resistor at this exact temperature or in a narrow interval around it greatly reduces the influence of temperature on electrical resistance, even if the thermal conditions are not optimal. Measurements of temperature coefficient were taken on a group of standard resistors of the same type in a wide temperature range, and the temperature of the stationary point was determined. Measurements were taken by placing the resistors in an oil bath and changing its set point temperature from 18 \({^{\circ }}\hbox {C}\) to 38 \({^{\circ }}\hbox {C}\). Electrical resistance of each resistor was measured using a resistance bridge, which had its reference resistor placed in a separate thermal enclosure at a constant temperature.

Keywords

Automatic resistance bridge Reference resistor Resistance measurement Standard platinum resistance thermometer 

Notes

Acknowledgements

This work was partially supported by Ministry of Economic Development and Technology, Metrology Institute of Republic Slovenia in scope of contract 6401-18/2008/70 for National standard laboratory for the field of thermodynamic temperature and humidity.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Metrology Institute of the Republic of Slovenia/University of Ljubljana-Faculty of Electrical Engineering/Laboratory of Metrology and Quality (MIRS/UL-FE/LMK)LjubljanaSlovenia

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