Error analysis in high-accuracy digital measurements

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• 作者：Renata T. Barros e Vasconcellos^a ; ^b ; ^{rbvasconcellos@inmetro.gov.br} ; ^{renatatbvasconcellos@gmail.com} ; Marcello L.R. de Campos^a
• 关键词：Digital sampling ; High-accuracy AC measurements ; Low-frequency electrical metrology
• 刊名：Measurement
• 出版年：2012
• 期刊代码：120_02632241
• 类别：et
• 出版时间：June, 2012
• 卷：45
• 期：5
• 页码：881-888
• 文件大小：445 K

摘要

Knowledge of the upper limits of errors in digital sampling is very important in high-accuracy measurements, for these errors are significant elements for establishing measurement quality. In this paper, we carefully go through the theoretical background necessary for an in-depth understanding of the main sources of errors in high-accuracy measurement of harmonic components. We assess the significance of each error source both qualitatively and quantitatively, and also the efficiency of error-reduction strategies. Theoretical results are backed by simulations and also experimental results obtained with digitally sampled data. We discuss the aliasing- and integration-error interplay due to the lowpass filtering performed prior to digital sampling. We also discuss the non-causal integration model often assumed for sampling devices, e.g., digital voltmeters, and how the correction term shall be used with periodical signals in practical measurement setups.