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Realization of the medium and high vacuum primary standard in CENAM, Mexico

2005; IOP Publishing; Volume: 42; Issue: 6 Linguagem: Inglês

10.1088/0026-1394/42/6/s01

1681-7575

J C Torres-Guzman, L A Santander, Karl Jousten,

Experimental and Theoretical Physics Studies

A medium and high vacuum primary standard, based on the static expansion method, has been set up at Centro Nacional de Metrolog?a (CENAM), Mexico. This system has four volumes and covers a measuring range of 1 ? 10?5?Pa to 1 ? 103?Pa of absolute pressure. As part of its realization, a characterization was performed, which included volume calibrations, several tests and a bilateral key comparison. To determine the expansion ratios, two methods were applied: the gravimetric method and the method with a linearized spinning rotor gauge. The outgassing ratios for the whole system were also determined. A comparison was performed with Physikalisch-Technische Bundesanstalt (comparison SIM-Euromet.M.P-BK3). By means of this comparison, a link has been achieved with the Euromet comparison (Euromet.M.P-K1.b). As a result, it is concluded that the value obtained at CENAM is equivalent to the Euromet reference value, and therefore the design, construction and operation of CENAM's SEE-1 vacuum primary standard were successful.