10.14489/td.2024.04.pp.038-046

2024, 04 April

DOI: 10.14489/td.2024.04.pp.038-046

Golobokov M. V.
ANALYSIS OF MEASUREMENT ACCURACY DURING VERIFICATION OF MIT TEMPERATURE METERS
(pp. 38-46)

Abstract. The paper presents an algorithm and the results of calculating the confidence limits of the measurement error of resistance (voltage) during verification of multichannel precision temperature meters MIT 2 and MIT 8. It is established that the actual error value of the meter in operation can exceed the permissible value by 4.3 times. In the temperature equivalent, the additional error can reach 130% of the limit of the basic permissible error of the reference platinum resistance thermometer PTS-10M of the first category. The necessity of attributing the measurement results by MIT meters to the most responsible measurements, for which even the minimum excess of the permissible error is not allowed, is justified. The corresponding decision-making rule has been formulated. The minimum ratio of errors of the reference and verifiable measuring instruments has been determined, in which the probability of erroneous recognition of an obviously suitable meter as unsuitable does not exceed 0.3 – the limit set in MI 186-88 "GSI. Measuring instruments. Setting the parameters of the verification methods" values. The required error ratio is no worse than 1/2. For widely used meters MIT 2.05, MIT 8.10, MIT 8.15, methods are proposed to improve the accuracy of measurements and ensure the required reliability of verification using recommended standards. To verify the relatively new and most accurate meters MIT 8.20, MIT 8.30, the need to use a secondary resistance standard is justified. The work can be useful to specialists involved in the development, operation of temperature measuring instruments and their metrological support.

Keywords: temperature meter, conformity assessment, measurement accuracy as-sessment, verification.

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M. V. Golobokov (State Regional Center of Standardization, Metrology and Testing in the Novosibirsk Region (FBA "Novosibirsk CSM"), Novosibirsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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