What dose mtbf: 1 2 million hours mean

MTBF, as chief said, is a wag.

Mean Time Before Failure is measure in a very strange way that makes it nearly worthless (to a consumer). Essentially, it is measured by testing several devices together; when the first device fails, the test is over, and the MTBF is calculated by:
MTBF = (number of devices being tested) * (time to first failure);
(edit: for what it's worth, I feel like I've got something a little wrong here, but I'm not quite sure what. This is at least quite close to how the measurement is performed :) )

So, in theory they could have run 1 million devices and had one device fail at the 1 hour mark.

Further, there is nothing official about this number, they can pretest the devices they use, set the test conditions, and retest as much as they want.

It is essentially a useful engineering metric, that can be twisted into a nice looking marketing number that makes it sound like the device you are buying will never fail.
 


i think u r wrong, it is not 114 days but 114 years . . . 😉
 

Umm you have got to be stupid i you read the last message e said 114 years not days and if you divide 41,667 days by 365 you get an amazing 114 YEARS!! Like mentioned above.
 

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