Vacuum Standards

Characterization of Gas Operated Piston Gauge against UIM, the Nation Primary Standard:

We have evaluated of measurement uncertainty using:

(a) Method of Effective Area Estimation of Piston-Cylinder assembly

Preparation of Uncertainty Budget

Determination of Coverage Factor for the required confidence level

Estimation of expanded uncertainty

Q(0.05 Pa, 0.000828 % of reading) at k=2.

(b) Method of Direct Comparison