Open AccessUncertainty Evaluation of the Electrical Transient Rise Time
Author(s) -
Pedro Oliveira Costa Machado Neto,
Paulo Cesar Ramalho Brandão,
Juan Carlos Mateus Sánchez,
Lúnia de Almeida de Coelho Lima,
Carlos Galhardo
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1826/1/012103
Subject(s) - oscilloscope , repeatability , metrology , digital storage oscilloscope , measurement uncertainty , interpolation (computer graphics) , transient (computer programming) , calibration , standard uncertainty , computer science , sampling (signal processing) , function (biology) , voltage , electronic engineering , electrical engineering , mathematics , engineering , statistics , telecommunications , evolutionary biology , operating system , frame (networking) , detector , biology
This paper deals with the uncertainty evaluation of the rise time of one pulse of an electrical fast transient burst (EFT/B), as carried out by the National Institute of Metrology, Quality and Technology (Inmetro) of Brazil. The uncertainty sources considered in this evaluation were: the oscilloscope resolution and calibration of voltage and time scale, in the Y-and X-axes, respectively; the bandwidth of the measurement system; the oscilloscope sampling rate; and the repeatability of ten different measurements. Two sets of measurements were taken from two different oscilloscope settings: in the first one, the interpolation function was enabled, and in the other one was disabled. In both cases two components stood out for their huge relative contribution: time reading and repeatability. Considered together, these two components added up approximately 87% of the expanded uncertainty for interpolated samples, and 95% for non-interpolated samples. Also, the results indicate that the oscilloscope interpolation function, if available, must be used, as the expanded uncertainty decreases by 27%. A discussion of the uncertainty budget example in Annex C of the IEC 61000-4-4 standard is presented, concluding that, once the oscilloscope interpolation function is enabled, the other uncertainty components should be considered. The combined relative contribution of these components is larger than the relative contribution of repeatability.