Abstract
This paper shows some limitations of the small quadropole mass spectrometer when it is used routine measurements in relatively good vacuum systems. Tests have been carried out on commercial instruments from four manufacturers all well-established and recognized in this field. The observed instabilities in the instruments indicate that careful calibration procedures should be incorporated into any experimental programme if quantitative results are required. Even with the instruments used as simple indicators of the vacuum conditions there is a danger of serious misinterpretation if the limitations are not well understood. It is pointed out that the limitations of small size, simplicity and low cost set to the manufacturers probably lead to performances well removed from the ideal.
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