Reevaluation of AC-DC current transfer system based on single junction thermal converters at INMETRO

• Autor(a) principal: Ventura, Rodrigo Vargas Freitas
• Data de Publicação: 2011
• Outros Autores: Souza, Regiane Maria de, Silveira, Flávio Alexandre da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do INMETRO
• Texto Completo: http://hdl.handle.net/10926/1638

As the national metrology institute of Brazil, Inmetro is responsible for the maintenance and support given to clients in Brazil and abroad. In order to implement its services with high quality performance, Inmetro develops systems which will provide the dissemination of the basic magnitudes. Corroborating to this mission, the Voltage and Current Laboratory (Latce) presents its standard for ac-dc current transfer based on Single Junction Thermal Converters (SJTCs), the behaviour of Latce’s standards, and the recent upgrades in the system. Responsible for the calibration of both voltage and current instruments, such as accurate multifunction calibrators and multimeters for other laboratories or industry, the transfer standards are between the first levels of the traceability pyramid for the dissemination of time-dependent voltage and current magnitudes. The system for ac-dc current transfer measurement has been improved since BIPM international key comparison of ac-dc current transfer standards – CCEM K12, by changes in the setup and uncertainty budget reevaluation. The aim of this paper is to show how Latce managed to reduce uncertainty magnitude.