Abstract
A general non-linearity in the pressure response of an extractor gauge, which results from a reduction in gauge sensitivity, has been observed and is caused by contamination of the collector. The worst case sensitivity reduction at UHV is about 30%, while it reaches a maximum of an order of magnitude at around 10 −4 Pa. We describe how the sensitivity reduction can be detected by switching the reflector between its normal positive potential and ground, and how the original sensitivity can be restored by glow-discharge cleaning.
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