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Evaluation of the measurement system for determination of frequency characteristics of functional blocks used in AC impedance bridges DOI:10.12915/pe.2014.11.14

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The paper presents a measurement system developed for determination of frequency characteristics of functional blocks used in precise automated AC impedance bridges. The paper presents the design assumptions, construction and results of investigation of the system detailing a range of tests necessary to assess its metrological properties. Streszczenie. Przedstawiono system pomiarowy przeznaczony do wyznaczania charakterystyk częstotliwościowych bloków funkcjonalnych stosowanych w precyzyjnych automatycznych mostkach impedancji. Przedstawiono założenia, konstrukcję oraz wyniki badań systemu pozwalające ocenić jego podstawowe właściwości metrologiczne. (Ocena systemu pomiarowego do wyznaczania charakterystyk częstotliwościowych bloków funkcjonalnych stosowanych w mostkach prądu przemiennego). Keywords: measurement system, voltage ratio measurement, calibration. Słowa kluczowe: system pomiarowy, pomiar stosunku napięć,kalibracja. doi:10.12915/pe.2014.11.14 Introduction The increase of accuracy and bandwidth of modern instruments and measurement systems used for accurate AC measurements imposes high demands on metrological properties of their constituent functional blocks. Comprehensive study of metrological characteristics of these blocks are necessary to assess their suitability to achieve the goals. More and more frequently used approach to improve the accuracy and expand the range of systems used in accurate measurements is determination of the actual characteristics of their functional blocks or deviations from their nominal characteristics and using them in software algorithms controlling the measurement systems [1, 2, 3]. Such a method of improving the metrological characteristics of measuring instruments is very popular today. However, its implementation at the part per million uncertainty requires a comprehensive study of these blocks, including the determination of their stability over time and temperature. Such studies r[...]

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