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ASTM E296-70(1999)

Historical Reaffirmation

Standard Practice for Ionization Gage Application to Space Simulators

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1.1 The purpose of this practice is to provide application criteria, definitions, and supplemental information to assist the user in obtaining meaningful vacuum ionization gage measurements below 10 N/m (10 torr) in space-simulation facilities. Since a variety of influences can alter observed vacuum measurements, means of identifying and assessing potential problem areas receive considerable attention. This practice must be considered informational, for it is impossible to specify a means of applying the vacuum-measuring equipment to guarantee accuracy of the observed vacuum measurement. Therefore, the user's judgment is essential so that if a problem area is identified, suitable steps can be taken to either minimize the effect, correct the observed readings as appropriate, or note the possible error in the observation.

1.2 While much of the discussion is concerned with the application of hot-cathode ionization gages, no exclusion is made of cold-cathode designs. Since a great deal more experience with hot-cathode gages is available and hot-cathode devices are used in the majority of applications, the present emphasis is fully warranted.

1.3 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.


SDO ASTM: ASTM International
Document Number E296
Publication Date Oct. 10, 1999
Language en - English
Page Count 13
Revision Level 70(1999)
Supercedes
Committee E21.04
Publish Date Document Id Type View
Nov. 1, 2020 E0296-70R20 Reaffirmation
Oct. 1, 2015 E0296-70R15 Reaffirmation
April 1, 2010 E0296-70R10 Reaffirmation
Sept. 1, 2004 E0296-70R04 Reaffirmation
Oct. 10, 1999 E0296-70R99 Reaffirmation