A Two-Stage, Guarded Inductive Voltage Divider with Small Ratio Errors for Coaxial Bridge Applications


  • Gregory A Kyriazis Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro)
  • J Angel Moreno Centro Nacional de Metrologí­a (CENAM)
  • Jürgen Melcher Physikalisch-Technische Bundesanstalt




The traceability chain to derive the capacitance unit from the quantum Hall resistance comprises some coaxial bridges. These bridges employ a main two-stage inductive voltage divider to provide the voltage ratio needed. One such divider has been recently constructed and calibrated at Inmetro. The design techniques responsible for the small ratio errors of the device and the calibration method employed are both detailed. The new divider was installed in Inmetro's two terminal-pair coaxial capacitance bridge with significant improvements in the bridge resolution and accuracy.

Author Biography

Gregory A Kyriazis, Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro)

Gregory A. Kyriazis was born in Rio de Janeiro, Brazil, in 1958. He received the engineering degree from Universidade Federal do Rio de Janeiro (UFRJ) in 1981, the M. Eng. degree from Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (CEFET-RJ), in 1995, the M.Sc. and Ph.D. degrees from Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa em Engenharia, Universidade Federal do Rio de Janeiro (COPPE/UFRJ), in 2001 and 2005, respectively, all in Rio de Janeiro and in electrical engineering. In 1995, he joined the Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro), Duque de Caxias, Brazil, where he is currently responsible for the coordination of the research and development across the Electrical Metrology Division, Inmetro. His research interests include ac bridges, sampling methods, signal analysis and statistical inference. Dr. Kyriazis is a founding member of the Sociedade Brasileira de Metrologia (SBM) and a member of IMEKO TC21 – Mathematical tools in measurements. He currently chairs the Electricity and Magnetism Metrology Working Group, Inter-American Metrology System (SIM), the Working Group for the Coordination of Regional Metrology Organizations, Consultative Committee on Electricity and Magnetism (CCEM) and the IEEE Rio de Janeiro Section - Instrumentation and Measurement / Control Systems Joint Societies Chapter.






Research Papers