  This Good Practice Guide provides information for the realization of the
farad from the quantum Hall resistance in graphene devices by using digital
impedance bridges. The fabrication and characterization of graphene quantum
Hall effect devices, the cryogenic environment required to achieve the
quantization conditions, the digital impedance bridges and calibration
procedures are reported.
  The guide is a deliverable of the Joint Research Project EMPIR 18SIB07 GIQS:
Graphene Impedance Quantum Standard. This project received funding from the
European Metrology Programme for Innovation and Research (EMPIR) co-financed by
the Participating States and from the European Unions' Horizon 2020 research
and innovation programme. Funder ID: 10.13039/100014132 , Grant no: 18SIB07.
