Seite/page 3
SN 29500-1 : 2004-01
Inhalt
Seite
1 Anwendungsbereich und Zweck..........................................................................................................4
2 Begriffe...................................................................................................................................................5
2.1 Umgebungstemperatur.........................................................................................................................5
2.2 Mittlere Umgebungstemperatur ............................................................................................................5
2.3 Referenzbedingungen ..........................................................................................................................5
2.4 Betriebsart ............................................................................................................................................5
2.5 Einsatzart..............................................................................................................................................6
3 Ausfallraten............................................................................................................................................6
3.1 Bedeutung des Erwartungswertes........................................................................................................6
3.2 Zeitbereich............................................................................................................................................7
3.3 Abweichungen von Herstellerangaben .................................................................................................7
4 Umrechnung der Erwartungswerte bei Referenzbedingungen auf Betriebsbedingungen .............7
4.1 Spannungsabhängigkeit, Faktor p
U
.......................................................................................................8
4.2 Stromabhängigkeit, Faktor p
I
................................................................................................................8
4.3 Temperaturabhängigkeit, Faktor p
T
.......................................................................................................9
4.4 Aussetzbetrieb, Faktor p
W
...................................................................................................................10
5 Qualität .................................................................................................................................................10
Zitierte Normen......................................................................................................................................11
________________________
Contents Page
1 Scope......................................................................................................................................................4
2 Terms and definitions ...........................................................................................................................5
2.1 Ambient temperature ............................................................................................................................5
2.2 Mean ambient temperature...................................................................................................................5
2.3 Reference condition..............................................................................................................................5
2.4 Operating mode....................................................................................................................................5
2.5 Description of environment ...................................................................................................................6
3 Failure rates ...........................................................................................................................................6
3.1 Meaning of expected value...................................................................................................................6
3.2 Time interval .........................................................................................................................................7
3.3 Deviation from manufacturers' specifications........................................................................................7
4 Conversion of expected values from reference conditions to operating conditions ......................7
4.1 Voltage dependence, factor p
U
.............................................................................................................9
4.2 Current dependence, factor p
I
..............................................................................................................8
4.3 Temperature dependence, factor p
T
.....................................................................................................7
4.4 Stress profile,
factor p
W
......................................................................................................................10
5 Quality ..................................................................................................................................................10
Normative references ............................................................................................................................11
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