1. 1) ISO 14291:2012 Vacuum gauges — Definitions and specifications for quadrupole mass spectrometer (ISO, Ganeva, 2012).
2. 2) ISO/TS 20175:2018 Vacuum technology — Vacuum gauges — Characterization of quadrupole mass spectrometers for partial pressure measurement (ISO, Ganeva, 2012).
3. 3) H. Yoshida : Vac. Surf. Sci., to be published. (in Japanese).
4. 5) H. Yoshida, K. Arai, H. Akimichi and M. Hirata : Vacuum 85, 78 (2010).
5. 6) W.G. Bley : Vacuum 38, 103 (1988).