An apparatus controlled by computer for vacuum gauge calibration

The apparatus controlled by computer for vacuum gauge calibration, with dyn amic comparison, static expansion and static comparison methods, can carry out calibration of vacuum gauges in the range from 10(-4) to 10(5) Pa. Acco rding to actual requirement, different reference standards and calibration methods can be chosen. It was constructed with metal and the calibration ch amber is spherical. A programmable logical controller can automatically rea lize logical control of valves, pumps and vacuum gauges to increase work ef ficiency. The computer software designed for use under Windows has a good i nterface. In addition, to make operation easy and convenient, dynamic data exchange technique and database management technique are used to realize au tomatic data collection and data processing. Six gauges may be calibrated a t the same time, therefore, it is optimal for routine use. (C) 1999 Elsevie r Science Ltd. All rights reserved.