本人是不是新手，但刚加入西模
根据IPC9591T = * [(Br;c)/n] 1/β ÷ AF
= 1.119*MTTF * [(Br;c)/n] 1/β ÷ AF (β=3)
Where
T is a minimum test time to request zero failure.
(Br;c) is a Poisson distribution factor with the failure number of
requal to zero , (Br;c)=2.303 when confidence level is 90%.
c is the decimal confidence level, and
n is sample size.
AF is acceleration factor， AF = 1.5(Ts-Tu)/10
Ts is Stress/Elevated Temperature
Tu is Unstress Temperature
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