Realization of an inductance scale traceable to the quantum Hall effect using an automated synchronous sampling system

Abstract

In this paper, the realization of an inductance scale from 1 µH to 10 H for frequencies ranging between 50 Hz and 20 kHz is presented. The scale is realized directly from a series of resistance standards using a fully automated synchronous sampling system. A careful systematic characterization of the system shows that the lowest uncertainties, around 12 µH H−1, are obtained for inductances in the range from 10 mH to 100 mH at frequencies in the kilohertz range. This new measurement system, which was evaluated during an international comparison, provides a primary realization of the henry, traceable to the quantum Hall effect. An additional key feature of this system is its versatility. In addition to resistance–inductance (R–L) comparison, any kind of impedance can be compared: R–R, R–C, L–L or C–C, giving this sampling system a great potential for use in many laboratories around the world.