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  1. Alex1000

    Calculation of FIT or MTBF

    Hello all, Thanx for the replies... @IRstuff: your using a linear distribution...isn't it? Should we not use a gaus-distribution? Here is the possibility which came into my mind (At the weekend after 5 beers.. :-)) barring this picture would be a gaus-curve... :-) The mid of the curve...
  2. Alex1000

    Calculation of FIT or MTBF

    HI, The requirement is that during lifetime of 10.000 h 5ppm of the ECU's are 'allowed' to go bad.. Is it now better defined? Regards Alex
  3. Alex1000

    Calculation of FIT or MTBF

    Hello all, from my customer I got the requirement for my system: 5 ppm at lifetime of 10.000 hours. How can I calculate the FIT and the MTBF out of this? What is wrong in this calculation? MTBF= 10.000h * 5 *10 exp -6 = 2 exp9 h Fit= 1/MTBF = 0.00024 thanx ALex

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