Calibration of 10 nF Capacitance Standard from dc QHR using a Digital Impedance Bridge

This paper describes a calibration method for 10 nF capacitance standard from the primary standard of dc quantum Hall resistance using a multi-purpose digital coaxial bridge. The capacitance standard of 10 nF was calibrated by a direct comparison against the ac resistance standard of 10 kΩ-its resistance value is traced to the quantum Hall resistance-using the digital bridge in the fully digital quadrature mode. The preliminary calibration value of the 10 nF was confirmed by comparing with a reference capacitance standard within uncertainty level of 10 ^-6 .