scholarly journals Uncertainty estimation of low voltage LI measurements with recurrent surge generator and oscilloscope

2020 ◽  
Vol 69 (3) ◽  
pp. 10-19
Author(s):  
Zdenko Godec ◽  
Vjenceslav Kuprešanin ◽  
Filip Razum

Low voltage LI measurement with recurrent surge generator and oscilloscope is a method used for investigatingLI distribution in transformer windings or in model prototypes for various conditions. In the paper, the procedure for measurement uncertainty estimation of characteristic voltage and time quantities is given. The procedure is similar to the procedure given in the IEC 60076-2 standard for high voltage testing, but it is fully adapted to low voltage measurement with recurrent generator and oscilloscope. For the purpose of reducing the measurement uncertainties and the measurement time, a new procedure is proposed.

2016 ◽  
Vol 99 (3) ◽  
pp. 612-617 ◽  
Author(s):  
Fabiane Lacerda Francisco ◽  
Alessandro Morais Saviano ◽  
Felipe Rebello Lourenço

Abstract Investigation of out-of-specification analytical results is laborious, time-consuming, and costly and must be well documented. However, an analytical result is not complete unless reported with its measurement uncertainty. Here, we compare four different approaches for measurement uncertainty estimation used in acetaminophen quantification in pharmaceutical drug products. Measurement uncertainties were estimated using a repeatability and reproducibility study, Eurachem/Citac guidelines, Monte Carlo simulations, and a spreadsheet method. These different approaches provided similar results. However, they differed by the sources of uncertainties considered, by the procedures of calculation, and by the effort required in routine applications. Nevertheless, all four approaches were successful in assessing conformity of acetaminophen content in pharmaceutical drug products and may be used in assessing pharmaceutical equivalence.


Measurement ◽  
2013 ◽  
Vol 46 (1) ◽  
pp. 572-581 ◽  
Author(s):  
E. Balestrieri ◽  
M. Catelani ◽  
L. Ciani ◽  
S. Rapuano ◽  
A. Zanobini

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