instantaneous failure ratemomentane Ausfallrate

limit, if it exists, of the quotient of the conditional probability that the failure of a non-repairable item occurs within time interval (t, t + Δt) by Δt, when Δt tends to zero, given that failure has not occurred within time interval (0, t) λ(t)=limΔt→01Δt F(t+Δt)–F(t)R(t)=f(t)R(t) λ(t)=limΔt→01Δt F(t+Δt)–F(t)R(t)=f(t)R(t) where F(t) and f(t) are, respectively, the distribution function and the probability density at the failure instant, and where R(t) is the reliability function, related to the reliability R(t1, t2) by R(t) = R(0, t).

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