Support of Metrological Traceability of Capacitance Measurements in Ukraine

The comparative analysis of the results of the RMO International key and supplementary comparisons of national standards of units of electrical capacitance is conducted with the aim of evaluation of convergence. For the comparisons, the reference values with the expanded uncertainties are calculated and the degrees of equivalence of standards of participants and expanded uncertainties for the nominal values of measures of 10 pF and 100 pF on frequencies of 1 kHz and 1.592 kHz are determined. Metrological traceability of the national standard of every participant of comparisons to the units of the International system of units SI is determined.For verification of consistency of the results of comparisons, the values of the χ2 criterion for the results of comparisons of standards of participants taking into account the measurement uncertainty are calculated. The obtained values of the criterion of consistency for the participants can be considered consistent, which is the objective confirmation of the measurement uncertainties declared by the participants.The evaluation of calibration and measurement capabilities of Ukraine for the unit of electrical capacitance is realized. The methodology of evaluation of measurement uncertainty in the wide range of capacitance values (from 10 pF to 10 nF) is proposed. The results the calculations of the values of measurement uncertainties according to the proposed methodology revealed that the results correspond to the data published in the International key comparison database for Ukraine in the range of capacitance values from 10 pF to 10 nF on frequencies of 1 kHz and 1.592 kHz

A Support of Metrological Traceability of Inductance Measurements in Ukraine

The comparative analysis of the results of the RMO International supplementary comparison of national standards of the units of inductance is conducted with the aim of evaluation of convergence. For the comparison, the reference values with the expanded uncertainties are calculated and the degrees of equivalence of standards of participants and expanded uncertainties for the nominal values of measures of 10 mH and 100 mH on a frequency of 1 kHz are determined. Metrological traceability of the national standard of every participant of comparisons to the units of the International system of units SI is determined.For verification of consistency of the results of comparisons, the values of the χ2 criterion for the results of comparisons of standards of participants taking into account the measurement uncertainty are calculated. The obtained values of the criterion of consistency for the participants can be considered consistent, which is the objective confirmation of the measurement uncertainties declared by the participants.The evaluation of calibration and measurement capabilities of Ukraine for the unit of inductance is realized. The methodology of evaluation of measurement uncertainty in a wide range of inductance values (from 10 µH to 100 H) is proposed. The results of the calculations of the values of measurement uncertainties according to the proposed methodology revealed that the results correspond to the data published in the International key comparison database for Ukraine in the range of capacitance values from 10 µH to 10 H on a frequency of 1 kH

Interlaboratory Comparisons of the Calibration Results of Signal Generator

The data of interlaboratory comparisons of calibration results of signal generators at three calibration points are presented. The choice of methodology for processing the results of interlaboratory comparisons is made taking into account the long-term drift of the comparison sample. The modernization and research of the comparison sample for interlaboratory comparisons of calibration results of signal generators are carried out. The assigned values for the three calibration points and their extended uncertainties are determined. Expressions are obtained for the approximation of the long-term drift of the comparison sample and uncertainty budgets for all assigned values of the comparison sample at the frequencies of 130 MHz, 168 MHz and 223 MHz are compiled.The interlaboratory deviations of the results obtained by laboratories are determined and the consistency of the data obtained using the En and z indicators is estimated. This characterizes the reliability and accuracy of laboratory measurement results, and is also important for confirming technical competence. The presented results of interlaboratory comparisons of the signal generator calibration results show that all participating laboratories meet the requirements by the En indicator. At the same time, two out of ten laboratories require certain substantial corrective measures, as they do not meet the requirements by the z indicator.It is established that the En indicator is not always self-sufficient. It largely characterizes only the reliability of laboratory measurement results. For this purpose, the z indicator is more informative, which provides more information on the accuracy of laboratory measurement, that is, the proximity of measurement results to the true value

Metrological Traceability of Impedance Parameter Measurements in Ukraine

The equivalence rates of the national standard of a unit of electrical capacitance for denominations of 10 pF and 100 pF at frequencies of 1 kHz and 1.592 kHz and expanded uncertainties obtained from the results of International comparisons of national measurement standards for electrical capacitance units were established and their comparative analysis was carried out. The equivalence of the national standard of the inductance unit for the nominal values of 10 mH and 100 mH at a frequency of 1 kHz and the expanded uncertainties obtained from the results of International additional comparisons of the national measurement standards of inductance units were established and their comparative analysis was carried out. The comparisons were conducted by Regional Metrology Organizations with the participation of the National Metrology Institute of Ukraine.The analysis of the data processing methods applied in the comparison reports was carried out with the aim of adequately evaluating the results obtained by each of the comparison participants. The results of the National Metrology Institute of Ukraine became the basis for establishing the metrological traceability of measurements of impedance parameters in the country and the recognition of the results of these measurements in other countries.Values of the expanded uncertainty of the measurements of the electrical capacitance in the range of values from 10 pF to 10 nF for high­precision calibration of the measures of electrical capacitance were calculated. Values of the expanded uncertainty of inductance measurements in the range from 1 µH to 10 H with high­precision calibration of inductance measures were calculated.The best values of the expanded uncertainty of measurements of impedance parameters (electrical capacitance and inductance) in a wide range of values in Ukraine were established. The comparative analysis showed that the published data on the calibration and measurement capabilities of the national metrology institutes of Ukraine for measuring the electrical capacitance and inductance can be significantly improved in wide ranges of values