Development of resistance and temperature measurement system for cryogenic equipment

Cryogenic equipment is used especially for the research on superconductors as the tools to create the condition of low temperature and high magnetic field. However, it needs the measurement system to be used to analyze the material properties. This work developed a control program of resistance measurement system using instruments of current source, nanovoltmeter and temperature controller. We designed and developed a measurement system by building a connection of the instruments and creating a new control program. The created control program can be revised or modified easily when we have to replace or add the instruments. LabVIEW program was used as a control program, and designed for measuring the resistance and controlling the temperature. Four-point probe method was used to measure the resistance value, a sensor to determine the temperature and a heater to control the temperature. The developed measurement system was tested using standard superconductor sample. It clearly showed the graph of the temperature dependence of resistance. And it showed sharp drop of resistance around 98K, indicating its critical temperature. IOP Conf. Series: Journal of Physics: Conf. Series, 2017, 817, 012055