Novel Two-Chamber Method for High-Precision TCR Determination of Current Shunts—Part II
Petar Mostarac, Roman Malarić, Hrvoje Hegeduš, Alan Šala
TL;DR
This paper describes a new two-chamber method for accurately measuring the temperature coefficient of resistance in current shunts.
Contribution
The two-chamber method improves thermal isolation and reduces measurement uncertainty in TCR determination.
Findings
The two-chamber method confirms theoretical predictions and uncertainty analysis from Part I.
The method shows high repeatability and is suitable for laboratory and interlaboratory tests.
Stability of current source and synchronization accuracy significantly affect measurement results.
Abstract
This paper presents the experimental implementation and validation of the two-chamber method presented in Part I for the high-precision determination of the temperature coefficient of resistance (TCR) of current shunts. The two-chamber approach enables improved thermal isolation and independent temperature control of the reference and test shunts, which significantly reduces the measurement uncertainty. In this part, the complete experimental setup is described, including the thermoelectric temperature control, the current generation and the data acquisition system with synchronized high-resolution digital multimeters (DMMs). The experimental measurements were carried out for different resistance ratios ranging from 0.1 to 10. The results confirm the theoretical predictions and the uncertainty analysis from Part I. The influences of the stability of the current source, the temperature…
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Taxonomy
TopicsAnalytical Chemistry and Sensors