The Measurement Uncertainty in Determining of Electrical Resistance Value by Applying Direct-Comparison Method

Pleština, Vladimir; Boras, Vedran; Turić, Hrvoje

doi:10.3390/en15062115

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…As this is generally a task of determining the material resistivity ρ using indirect measurements, it was necessary to quantify the measurement uncertainties Type A and B for all measured data and then integrate these influences into the final result [53,54]. An example of the evaluation is performed on a brass bar with the label CuZn39Pb3.…”

Section: Samples Identification-measurement Of Electrical Resistivitymentioning

confidence: 99%

“…As the resistivity of the sample is determined by indirect measurement, it is necessary to combine all the estimated uncertainties in the current, voltage, and geometric dimensions of a sample by applying the law of uncertainty propagation to the measurement model used [53,54]. We did not consider any covariance and the measured values of the voltmeter, ammeter, and calipers were not correlated.…”

Section: Direct Measurement Of the Diameter And The Spacing Of The Se...mentioning

confidence: 99%

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Realization of a Test Tool for Diagnosis of Contact Resistance and Measurement of Selected Types of Conductive Materials

Kacor

Bernat

Mlčák

et al. 2023

Sensors

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Contact connections in electrical machines and apparatus are important elements in the whole power supply network and a high level of reliability is expected there. Contact resistance is a fundamental criterion in the design of an electrical contact or contact system. The contact resistance should be as low as possible to minimize losses due to the current passage and the related heating of the contact connection. The value of the contact resistance depends on the material used, the value of the applied force, the type of contact, and, last but not least, the quality of the surface and chemical layers. In this paper, an initial diagnosis of the contact material is performed based on the determination of the sample’s specific resistivity by the four-wire method and the evaluation of the measurement uncertainty. The work is followed by the design of a testing device that uses crossed bars to measure the change in contact resistance as a function of the magnitude of the applied force. An analysis of the sample mounting method is performed here using FEM simulations of the current field and shows the interaction between the holder and the sample in terms of current line transfer. The proposed system is then used for experimental measurements of the material-dependent coefficient KC for verification of existing or newly developed materials in electrical engineering, where the values of the KC coefficient are not known. Finally, the paper also deals with the measurement of fritting voltage for individual contact pairs having surface quality corresponding to brushing.

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Section: Samples Identification-measurement Of Electrical Resistivitymentioning

confidence: 99%

Section: Direct Measurement Of the Diameter And The Spacing Of The Se...mentioning

confidence: 99%

Realization of a Test Tool for Diagnosis of Contact Resistance and Measurement of Selected Types of Conductive Materials

Kacor

Bernat

Mlčák

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…The process of determining the expanded uncertainty was undertaken in the paper [18]. Here, a method is presented for estimating the uncertainty of the measurement result for both mutually uncorrelated and correlated input quantities.…”

Section: State Of the Artmentioning

confidence: 99%

The Influence of Noise Level on the Value of Uncertainty in a Measurement System Containing an Analog-to-Digital Converter

2023

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For newly developed measuring systems, it is easy to estimate type-B uncertainties based on technical data from the measuring modules applied. However, it is difficult to estimate A-type uncertainties due to the unknown type and level of interferences infiltrating the measuring system. This is a particularly important problem for measurements carried out in the presence of typical of power grid disturbances. The aim of the research was to develop a method and a measurement stand for experimental assessment of uncertainties in a measuring system that makes use of data acquisition modules containing analog-to-digital converters (ADCs). The paper describes, in detail, the design of a completed test stand. It presents an original application in the LabVIEW environment, which enables testing the dependence of the uncertainties with the quantity of the measurements averaged in a series, for different kinds and levels of interferences infiltrating the measuring path. The results of tests for several popular measuring modules are presented. An analysis of the determined uncertainties was carried out in relation to the parameters of the tested measurement modules and for various levels of interferences. It is proved that an increase in the number of averaged measurements to approx. 100–200 always results in a decrease in uncertainty for each tested module and under all conditions. However, a further increase in the quantity of measurements, even up to 1000 averaged measurements, proved reasonable only for high-accuracy modules, in particular with a high level of interferences. An excessive increase in the quantity of averaged measurements proved a low effect for modules characterised by a low resolution and with a low level of interferences. The measurement results also proved that when estimated, uncertainties in the interference probability distribution are significant, especially if they deviate from normal distribution.

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Bibliometric review of measurement uncertainty: Research classification and future tendencies

Kusnandar,

Firdaus,

Supono

et al. 2024

Measurement

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The Measurement Uncertainty in Determining of Electrical Resistance Value by Applying Direct-Comparison Method

Cited by 5 publications

References 13 publications

Realization of a Test Tool for Diagnosis of Contact Resistance and Measurement of Selected Types of Conductive Materials

Realization of a Test Tool for Diagnosis of Contact Resistance and Measurement of Selected Types of Conductive Materials

The Influence of Noise Level on the Value of Uncertainty in a Measurement System Containing an Analog-to-Digital Converter

Bibliometric review of measurement uncertainty: Research classification and future tendencies

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