Calibration stability of some hot-cathode ion gauges

Abstract

Data are presented on the stability of calibration of some hot-cathode ion gauges: a conventional triode used in the range of 0.0002–0.2 Pa, and Bayard-Alpert-type gauges used in the range of 0.0002–0.02 Pa. Numerical magnitudes are given of the systematic corrections that must be applied to the gauge indication in order to achieve the highest accuracy of pressure indication. The relative sensitivities of these gauges to Ar, N2, Ne, and He are also given.