Agreed proposal, 10 January 2006
The primary standard of both BIPM and LNE is a pressure balance derived from the SI units through dimensional measurements, mass and gravity determination. The pressure delivered by the pressure balance is issued from these measurements by using the so-called effective area, and by applying different corrections
The scope of the comparison is to demonstrate the coherency of the measurements done in the two institutes, by checking the validity of the calculations, and evaluating the level of uncertainty attainable in the direct comparison of two pressure balances.
The pressure balance of BIPM will be moved to LNE and directly compared to the primary standard of LNE. The BIPM standard is a PG 7607 type pressure balance made by DHI. The LNE standard is the absolute pressure balance APX developed in cooperation with DH Budenberg. Both standards will be equipped with