95Chapter ve: The fundamental solution for reliability assurance:
bases of this method will be explained in terms of simple mental arithme-
tic in subsequent sections.
5.4 Denition and procedure of parametric ALT
Parametric ALT is an accelerated life test with parameters for quanti-
cation. Parametric ALT is dened as a quantitative accelerated life test
method that can predict item lifetime, and failure rate within lifetime,
using the results of planned testing with an acceleration factor (AF).
*
The
AF is calculated with parameters taken from the life-stress model of the
dominant failure mechanism occurring in the item (under the given phys-
ical and chemical conditions). The minimum test period is determined
using the targeted ...