Abstract
Total pressure gauges are used to measure the level of vacuum in a system independent of the gas species. Partial pressure analysers measure the occurrence of each gas species separately. This report explains the methodology of measurement, summarizes the measurement principles of total pressure vacuum gauges, and updates the standardization work for their calibration. On the matter of partial pressure measurement, this report explains the mass filtering by the quadrupole mass spectrometers and outlines the measurement problems with these instruments.
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