  This paper describes the thermal characterization of a coaxial calculable
resistor, part of traceability chain of the capacitance unit to the quantum
Hall effect, in construction at Inmetro. The realization of the capacitance
unit (farad) is related to the QHE by a calculable coaxial resistor, and three
low-uncertainty coaxial bridges: the two-terminal and the four-terminal
bridges, already in operation at Inmetro; and the quadrature bridge, in final
stage of construction.

Instrumentation and Detectors