– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
Search facility:


| Site map | News | Contact us
CIPM, 2000

"use of the von Klitzing constant to express the value of a reference standard of resistance as a function of the quantum Hall effect"

At its 89th meeting in 2000, the CIPM approved the following declaration of the 22nd meeting of the CCEM (CCEM, 22, 90):

    "The CCEM, having reviewed the 1998 CODATA least squares adjustment of the fundamental constants, is now of the opinion that the quantum Hall effect, together with the value of RK-90, can be used to establish a reference standard of resistance having a relative one standard deviation uncertainty with respect to the ohm, estimated to be 1 x 10–7, and a reproducibility which is significantly better. This represents a reduction in the uncertainty of a factor of two compared with the 1988 recommendation."



Reference:

Procès-Verbaux des Séances du Comité International des Poids et Mesures, 68 (2000), 2001, 101