Abstract
This paper describes the principle of a new fully automated digitally assisted coaxial bridge having a large bandwidth ranging from 60 Hz to 50 kHz. The performance of the bridge is evaluated making comparisons between calculable ac resistors. The agreement between the calculated and the measured frequency dependence of the resistors is better than at frequencies up to 5 kHz, better than up to 20 kHz and better than up to 50 kHz. This bridge is particularly well suited to investigate the ac transport properties of graphene in the quantum Hall regime.
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