J Schurr et al 2009 Metrologia 46 619 doi:10.1088/0026-1394/46/6/003
J Schurr1, V Bürkel1 and B P Kibble2
Show affiliationsSince the quantum Hall resistance (QHR) measured with alternating current (ac) has reached the state of an excellent quantum standard of impedance, we have realized a quadrature bridge with two ac QHRs to accurately calibrate capacitance standards in terms of the SI value of the von-Klitzing constant, without the need for any calculable artefact. The advantages of the realized measuring chain, experimental tests of the coaxial ac bridges involved and the achieved relative uncertainty of 6 × 10−9 (k = 1) are discussed.
Issue 6 (December 2009)
Received 26 June 2009, in final form 30 August 2009
Published 7 October 2009
J Schurr et al 2009 Metrologia 46 619
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