I don't think MTBF is a good number to use for technical life.  If I
were selling a large piece of equipment, I might expect it to last
for 10 to 15 years, including refurbishment.  I think this is a
better starting point.

Regards,
Brian Epstein
ENT Consulting
[log in to unmask]
(805) 591-9587

At 03:18 AM 1/19/2007, James, Chris wrote:
>It would seem the final version of the "General Rule of EFUP for EIP"
>will provide some indicative figures to use for various types of EIP.
>However for now we are left with the draft guide available here:
><<<http://www.rohs-international.com/files//General_rule_of_Environment_F>http://www.rohs-international.com/files//General_rule_of_Environment_F
>riendly_use_Period_of_Electronic_Information_Products.pdf
><http://www.rohs-international.com/files/General_rule_of_Environment_Fri
>endly_use_Period_of_Electronic_Information_Products.pdf> >>
>
>
>
>
>
>
>
>The draft General Rule suggests the EFUP number is calculated thus:
>
>************************************************************************
>***********************
>
>4.3.2 Technical Life Method
>
>The formula to calculate EFUP by using product technical life:
>
>EFUP = Technical Life / (average daily working time x 365) (1)
>
>EFUP = Technical Life / (average daily working time x 365) x 125% (2)
>
>
>
>Formula (1) applies to EIP that can not be repaired; formula (2) applies
>to EIP that can be repaired.
>
>
>
>4.3.3 Safe Use Period Method
>
>If the product has the Safe Use Period, should use the Safe Use Period
>as the EFUP.
>
>
>
>4.3.4 Comparison Method
>
>The new EIP without defined technical life and safe use period should
>adopt the EFUP of same or similar category product as its EFUP.
>
>************************************************************************
>************************
>
>
>
>
>
>
>
>This now poses the question as to what is "the technical life". From
>inference of condition (2) this could mean the MTBF, rather than how
>long one might expect the technology to remain current. To arrive at
>"15" would imply a MTBF of approx 4 years and daily use of 8hrs giving:
>(4x365x24/8x365)x1.25 = 12x1.25 = 15
>
>
>
>There has been some suggestion not to use numbers over 15 or 20, but for
>professional products having MTBF's greater than 20 years and not
>running 24/7 this would in fact push the EFUP figure above
>60.............
>
>
>
>
>
>Has anyone got any other input on this or know when the final "General
>Rule of EFUP for EIP" is going to be published??
>
>
>
>
>
>
>
>
>
>Regards,
>
>Chris
>
>
>
>
>
>
>
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