engleski

Prediction of the output voltage of DC voltage standards

In this paper we report some methods which upgrade the measurement uncertainty evaluation in analysis of the prediction of the output voltage of DC Reference Standards (Fluke 732A at 1 V, 1, 018 V and 10 V levels). The monitoring of long-term stability of Zener-based voltage reference standards is one of the main tasks of Primary Electromagnetic Laboratory (PEL), which is a part of the Faculty of Electrical Engineering and Computing of the University of Zagreb, and a holder of national standards of voltage in Croatia. The long-term stability of its DC Reference Standard has been analysed according to the calibration data obtained in different laboratories over a period of more than twenty years. The weighted least-squares fitting was used and the regression coefficients were calculated, by which the maintained voltages at all three outputs can be predicted for a moment of interest. This approach significantly reduces the uncertainties of the maintained voltages.

DC reference voltage standard; least-squares analysis; long-term drift

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