BS EN 61709:2017 gives guidance on the use of failure rate data for reliability prediction of electric components used in equipment.

The method presented in this document uses the concept of reference conditions which are the typical values of stresses that are observed by components in the majority of applications.

Reference conditions are useful since they provide a known standard basis from which failure rates can be modified to account for differences in environment from the environments taken as reference conditions. Each user can use the reference conditions defined in this document or use their own. When failure rates stated at reference conditions are used it allows realistic reliability predictions to be made in the early design phase.

The stress models described herein are generic and can be used as a basis for conversion of failure rate data given at these reference conditions to actual operating conditions when needed and this simplifies the prediction approach. Conversion of failure rate data is only possible within the specified functional limits of the components.

This document also gives guidance on how a database of component failure data can be constructed to provide failure rates that can be used with the included stress models.

Reference conditions for failure rate data are specified, so that data from different sources can be compared on a uniform basis. If failure rate data are given in accordance with this document then additional information on the specified conditions can be dispensed with.

This document does not provide base failure rates for components - rather it provides models that allow failure rates obtained by other means to be converted from one operating condition to another operating condition.

The prediction methodology described in this document assumes that the parts are being used within its useful life. The methods in this document have a general application but are specifically applied to a selection of component types as defined in Clauses 6 to 20 and I.2.


Cross References:
IEC 60050-192:2015 ED1
IEC 61703:2002
IEC 60721
ISO 13584
IEC 61360
IEC 62007
ISO 10303-31:1994
IEC 60721-3-3:1994 Cons Ed 2-2
IEC 60050-521:2002 Ed 2
IEC 61360-4:2005 DB
IEC 62741:2015
IEC 61710:2013
IEC 60300-3-5:2001
IEC 60050-151:2001 Ed 2
IEC PAS 62435:2005
IEC 61014:2003
IEC TR 61508-0:2005
ISO 10303-11:2004 (R08) Ed 2
IEC 62308:2006 Ed 1
IEC 61810-2:2011
IEC 61163-2:1998
IEC 60721-3-5:1997
IEC 61810-2-1:2011
IEC 61649:2008
IEC 60747-1:2006 Cons Ed 2-1
IEC TR 60943:1998
IEC 60650
IEC 60300-3-3:2017
IEC 60747-12-2:1995
IEC 60300-3-2:2004
IEC 61812-1:2011 Ed 2
IEC TR 62380:2004
IEC 60721-3-4:1995
IEC 60721-3-7:1995 Cons Ed 2-1
IEC 60319:1999
IEC 61360-1:2009
BS IEC 60605-6:2007


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