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Topic Title: MTBF Calculations
Topic Summary: Burn in affecting MTBF figures
Created On: 06 December 2010 11:11 AM
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 06 December 2010 11:11 AM
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TerryTheFish

Posts: 4
Joined: 01 December 2010

Can anyone please tell me if there is an 'easy' answer to this. I have an electronic sensor with a rated MTBF of 47,500 hours. I understand I can improve the MTBF by applying a factor for burn-in testing, be it 8, 12 or 24 hours. Is there a simple factor I can apply as I need to increase the MTBF figure by about 10%.
 06 December 2010 02:03 PM
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StewartTaylor

Posts: 99
Joined: 18 January 2003

My simple answer to this would be 'No'.

You can reduce your 'infant mortality' probability by doing/specifying a burn-in, provided it's properly stressful but all you're doing is weeding out the weak items that would fail early. Assuming that you need an average MTBF over the life of a plant or product (i.e. mean time between failures rather than mean time before failure) then dropping down the 'bathtub' at the front end isn't going to help much over the life of the system.

In any case, most reputable products these days have some degree of burn-in and the 47,500 hr MTBF figure probably takes this into acount.

-------------------------
Reality is that which, when you stop believing in it, doesn't go away.
 07 December 2010 02:46 PM
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TerryTheFish

Posts: 4
Joined: 01 December 2010

Many thanks for that, much appreciated.
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