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The quantum Hall effect is the basis for the realisation of the resistance and impedance units in the International System of units since 2019. This paper describes a cryogenic probe that allows to set graphene Hall devices in quantisation conditions in a helium bath (4.2 K) and magnetic fields up to 6 T, to perform precision measurements in the AC regime with impedance bridges. The probe has a full coaxial wiring, isolated from the probe structure, and holds the device in a TO-8 socket. First, characterization experiments are reported on a GaAs device, showing quantisation at 5.5 T.  In the AC regime,  multiple-series  connections will be employed to minimize the residual error, quantified by electrical modelling of the probe .

Design and development of a coaxial cryogenic probe for precision measurements of the quantum Hall effect in the AC regime