New generation of AC-DC Current Transfer Standards at Inmetro
Authors: Souza Regiane , Afonso Jr. Renato , Klonz Manfred , Landim Regis 
Published: June 2016

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mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} --> <!--[endif] --> <p class="Abstract"><span lang="EN-US">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. </span></p> <p class="Abstract"><span lang="EN-US">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.</span></p>