New generation of AC-DC Current Transfer Standards at Inmetro
DOI:
https://doi.org/10.21014/acta_imeko.v1i1.24Abstract
This paper describes the new primary standard for the ac-dc current transfer at Inmetro, based on PMJTCs and the new shunts manufactured by Fluke for rated currents from 10 mA up to 20 A.
The build-up of the ac-dc current scale is described together with the uncertainty budgets which result in final uncertainties at 5 A of 6 µA/A to 12 µA/A in the frequency range from 10 Hz to 100 kHz. The recalibration of the standards after one year showed very small differences which are included in the uncertainty budget.
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