The dimensional calibration of piston-cylinder units to be used for pressure metrology and the re-determination of the Boltzmann constant

Measurement procedures for the dimensional calibration of piston-cylinder type primary pressure standards which are intended to be used in a project for the re-determination of the Boltzmann constant are described. A numerical post-processing procedure is described to generate precise three-dimensional data sets from the 1D data sets. These data sets are required for the effective area determination of the pressure standards. Typical measurement results are discussed.