As default, the bearing life is calculated for a reliability of 90%. The required reliability can be changed here with limits 90% and <100%. The life modification factor for reliability 'fac' is calculated according to this input using either the three parameter Weibull relationship as given as formula in (ISO/TR 1281-2, 2008) or the two parameter Weibull relationship used in (ISO 3408-5, 2006).
