ASTM-E296 2004

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E296-70(2004) Standard Practice for Ionization Gage Application to Space Simulators

Published By	Publication Date	Number of Pages
ASTM	2004	14

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Category: ASTM

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Description

1.1 This practice provides application criteria, definitions, and supplemental information to assist the user in obtaining meaningful vacuum ionization gage measurements below 10 ¹ N/m ² (10 ³ 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.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Apparatus Gage Mounting
3	Gage Orientation FIG. 1 FIG. 2 FIG. 3
4	Operational Errors Gage Correction for Gas Composition
5	Determination of Gas Composition Operating Criteria Heavy Molecular Weight Contamination Effects
6	Apparent X-Ray Limit for Hot-Cathode Gages Gage Factors—Cold-Cathode Gages
7	X1. GAS CORRECTION FACTORS FOR IONIZATION GAGES X1.1 X1.2
8	X1.3 Graphs and Tables TABLE X1.1
9	FIG. X1.1
10	FIG. X1.2
11	X2. GAS TEMPERATURE CORRECTIONS IN TUBULATED GAGES X2.1 Introduction X2.2 Temperature Correction Factor FIG. X1.3
12	X2.3 Discussion
13	REFERENCES TABLE X2.1