Improving of Methods of Impedance Parameters Units Reproduction and Measurement Accuracy Increasing for Ensuring Metrological Traceability

A method for finding points of optimal comparing of heterogeneous impedance parameters (active resistance, electrical capacity, inductance) is developed, combinations of such points have been found to achieve the highest metrological characteristics of national standards of impedance, methods for choosing the optimal transfer scheme to minimize the measurement error are proposed. The structural-algorithmic method of increasing the accuracy of the impedance units’ measures calibration by excluding cross-nominal comparing is considered. Constructive and technological methods of increasing measurement accuracy to ensure metrological traceability of impedance parameter units in the full range of values are considered. A calibration method is developed and a procedure for estimating measurements uncertainty during the calibration of measures of electrical capacitance and inductance, precision LCR-meters on state standards with traceability to international standards of electric capacity is proposed. The main factors affecting the measurement result are considered, and their contribution to measurement uncertainty is quantified. General approaches to calibration are given, measurement equations (models), as well as examples of uncertainty budget calculations, are presented. The use of the proposed methods allows reaching a new qualitative level of measurements when using existing standard equipment. The presented materials can be used by national metrological institutes, calibration and testing laboratories, conformity assessment agencies that perform measurements of electromagnetic quantities.