PREDICTION OF THE OUTPUT VOLTAGE OF DC VOLTAGE STANDARDS

• Abstract:

  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.
• Keywords:

  DC reference voltage standard, least-squares analysis, long-term drift
• Download:

  IMEKO-WC-2009-TC4-670.pdf
• DOI:

  _unreg_wc-2009.670

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