Features of a New Controlled-clearance Pressure Balance and In Situ Mass Calibration of Its Weights

Abstract

We are developing a controlled-clearance pressure balance with the aim of upgrading the hydraulic high-pressure standard for pressures up to 1 GPa. This pressure balance is equipped with an automatic weight-loading unit; the total mass of the weights is about 1100 kg and each weight is loaded independently on the piston. In this study, as a preliminary step for the evaluation of the generated pressure, the masses of heavy weights are calibrated in situ using a digital mass comparator. To manipulate the heavy weights safely and precisely and to reduce the uncertainty of their masses, some auxiliary devices, such as hand-rotating jacks and a centering base, were introduced. The mass calibration was performed twice, in 2003 and 2006, and the results were compared with each other. The uncertainty of the mass in the latest calibration (2006) was reduced because the waiting time before data acquisition was set appropriately. The relative difference in the masses obtained in the two calibrations was less than 2 parts per million and the absolute value of the normalized error, En, was less than unity. Thus, it is confirmed that the weight set has been kept under suitable conditions and that the masses of the weights are sufficiently stable.

Cite this work

No public copy is stored for this record, so only the metadata is cited.

Stored only when both papers are in the corpus — 8 citations exist upstream.

Papers that cite the same references — the relational fallback while embeddings are still backfilling.