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.