MAINTENANCE OF THE REFERENCE RESISTANCE STANDARDS OF THE PRIMARY ELECTROMAGNETIC LABORATORY IN CROATIA
Damir Ilić, Mario Krešić
Abstract:
The past calibrations of the reference resistance standards of the Primary Electromagnetic Laboratory (PEL), the Leeds&Northrup (L&N) 1 Ω and 10 kΩ standards, carried out over a period of more than thirty years, have been analysed. The least-squares fitting was used and the regression coefficients of up to the 3rd order polynomial were calculated and evaluated, by which their resistances can be predicted for a moment of interest. Both standards have been maintaining into the self-developed oil ultrathermostat, where a stable temperature of 23 °C is maintained by the computer-based regulator within the limits of ±10 mK. Therefore, in the paper the analysis of the standards itself, as well as the achievement in the temperature regulation, as the basis of their use as reference standards, are described and pointed out.
XIII IMEKO TC4 International Symposium on Measurements for Research and Industrial Applications (together with IXth International Workshop on ADC Modeling and Testing, IWADC)
