The Resistance-Frequency Method (Rf-method) as an Alternative for Precision Measurement of the Mutual Inductance Coefficient of the KС-4 Reference Quartz Measure from the State Primary Standard for Units of Magnetic Quantities GET 12–2025

As part of the metrological assurance of the State Primary Standard for Units of Magnetic Induction, Magnetic Flux, Magnetic Moment, and Magnetic Induction Gradient GET 12–2025, precision measurements of the geometric parameters of the KC-4 quartz gauge windings are carried out at five-year intervals.

However, the traditional measurement procedure for the KC-4 is time-consuming and costly, as it requires the use of special equipment, complex methods, and labor-intensive error accounting.

It is possible to optimize the measurement procedure by developing, instead, an alternative method of determining the KC-4 constant without loss of accuracy. Research in this direction is being conducted at the Laboratory of State Standards in the Field of Magnetic Measurements of the D. I. Mendeleyev Institute for Metrology, whose staff are the authors of the article.

The authors of the article focused their search for an alternative method of determining the KC-4 constant based on the resistance-frequency method (Rf-method). The measurement experiment comprised approximately 20 measurement series. Equipment from GET 12–2205 was used, and a procedure for determining the KC-4 constant based on frequency and resistance measurements was implemented.

As a result of the study, the viability of the proposed alternative method was proven. The error of the alternative method established in this iteration of the experiment is five times higher than that of the traditional geometric method for determining the constant. However, potential opportunities for improving the accuracy characteristics of the alternative method were identified.

The results of the study presented in this article will serve as a foundation for further experiments on the development of the Rf-method after improving the equipment and software used. If positive results are obtained in the future, the Rf-method will be implemented into the metrological assurance procedure of the State Primary Standard GET 12–2025. 

The publication contributes to the field-specific discussion prompted by the ongoing redefinition of the International System of Units (SI) within the metrological community and the increased measurement accuracy of resistance and frequency units. The experimental material presented in the article will provide an impetus for the search for optimal solutions to improve the national reference base in the field of magnetic measurements.

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