Jean-Marie David

The BNM Watt balance project

A new watt balance project is now developed by the BNM: the general configuration and the main parts of the experimental set-up in development are presented. Its aim is to contribute to the international effort in monitoring the kilogram towards a new definition of the mass unit with an accuracy of 10-8 or better

Magnetic circuit design for the BNM Watt balance experiment

BNM has started since 2001 the development of a watt balance experiment. The authors present in this paper the design of the magnetic circuit intended to equip it

Determination and minimization of parasitic forces and moments in the static step of the LNE watt balance experiment

In watt balance experiments, a part of the uncertainty is caused by parasitic forces and moments acting on the coil of the set-up during the static step. We present a method to determine and minimize them and the consequences on the design of our watt balance experiment

Progress on the LNE watt balance project

This paper describes the main progress on the LNE watt balance project since 2004. Development of different parts and structure of the watt balance including starting their assembly are presented.

Toward a determination of R K at LNE with a new Thompson-Lampard calculable capacitor

This paper presents the French project aiming to determine the von Klitzing constant RK with an uncertainty of one part in 108. The design adopted for a new Thompson-Lampard calculable capacitor and some parts of the impedance comparison measurement chain are presented.