Different methods, based both on analytical considerations and on the Monte Carlo evaluation, were applied to the calculation of the correction factor, , of the conductance of the orifice of the new Istituto di Metrologia "G. Colonnetti" (CNR-IMGC) dynamic system. The results are compared and the uncertainty with which is determined is discussed. The data from the McCulloh method and from Monte Carlo simulations are compared. The latter method, while taking into account the conductance of all the geometrical parts, offers the possibility of evaluating the uncertainty without any approximation.
The backstream from the pumping chamber to the calibration chamber in a continuous gas expansion vacuum standard was determined using an experimental method and the Monte-Carlo (MC) simulation. The results were compared and appeared to be in agreement within 2 × 10 −5 . This supports our opinion that the MC method can be a useful tool in an analysis of vacuum metrological systems. We can also conclude that, in analysis of high vacuum standards, the assumption that the scattering process is described by the cosine law is reasonable.
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