Vacuum technology. Vacuum gauges. Specifications for hot cathode ionization gaugesBS ISO 27894: 2009 Vacuum technology. Vacuum gauges. Specifications for hot cathode ionization gauges BS ISO 27894 defines terms relating to hot cathode ionization vacuum gauges. It also specifies which parameters are given by manufacturers, and which measurement uncertainties have to be considered. a) BS ISO 27894 updates some terms and definitions given in ISO 3529 3: 1981. b) BS ISO 27894 specifies information for suitable laboratories to correctly

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