SUBDIVISION METHOD APPLIED FOR OIML WEIGHTS USING AN AUTOMATIC COMPARATOR

Adriana Valcu, Dumitru Dinu

Abstract

According to International Recommendation OIML R 111, the weights of nominal values greater than 1 g may have a cylindrical shape with a lifting knob. Taking into account this kind of shape and that in the case of an automatic comparator, with the maximum capacity of 1 kg, the diameter of weighing pan is quite small for placing a group of weights from 500g to 100g, the subdivision method can’t be applied for the calibration of weights.<br />By using the subdivision method presented in this paper, the cylindrical weights with a lifting knob, having nominal values from 500g to 100 g are calibrated using an automatic comparator (which is not foreseen with weight support plates).<br />The method can be used for E₁ weights, when the highest accuracy is required.<br />Uncertainty obtained in this case for the unknowns weights is better than that obtained usually for E₁, being at the level acquired for reference standards.

Keywords

subdivision of the kilogram, mass calibration, automatic comparator

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IMEKO-WC-2009-TC3-149.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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