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Standard
ISO 9621
First edition
Space systems — Methods to decide
2024-05
thermal vacuum test cycles of
recurring production according
to precipitation efficiency and
reliability
Systèmes spatiaux — Méthodes pour déterminer les cycles
d'essais sous vide thermique de la production récurrente en
fonction de l'efficacité et de la fiabilité des précipitations
Reference number
ISO 9621:2024(en) © ISO 2024
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ISO 9621:2024(en)
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© ISO 2024 – All rights reserved
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ISO 9621:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, and abbreviated terms . 1
3.1 Terms and definitions .1
3.2 Abbreviated terms .2
4 Methods of TVT cycles determination . 3
4.1 General .3
4.2 Failure data collection and analysis .3
4.3 Method 1 – Precipitation efficiency method .4
4.3.1 General .4
4.3.2 Precipitation efficiency estimation .5
4.4 Method 2 – Reliability method .6
4.4.1 General .6
4.4.2 Reliability method .6
4.5 Empirical equivalent fatigue exponent by failure data .7
Annex A (informative) Theory of estimating PE and its lower band limit . 9
Annex B (informative) Worked example .
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