Abstract
This article describes the experiments performed within a simple vacuum system used for verifying the molecular flow conductance of two long tubes in series. Consistently low conductance values in one of the tubes are attributed to the long-term ionic pumping speeds of the three Bayard-Alpert ionization gauges used in the measurements. A short computer program is described to incorporate the gauge pumping speeds as variables into the calibration calculations for the gauges. These variables are then manipulated to allow a match between expected conductance values and the experimental conductance values obtained with the gauge calibration curves. As the gauges age, their performance is shown to deteriorate.
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