In message
<2CF77CABFB3BC045B2724A8EF4182E73129FBB2D25@P3PW5EX1MB13.EX1.SECURESERVER
.NET>, dated Mon, 20 Oct 2014, "[email protected]"
<[email protected]> writes:
. I haven?t found anything yet that says increasing the time at the
temperature accelerates the life even more.
Think about it: a very brief exposure won't have any effect, whereas a
longer one will. After that longer period, there may or may not be an
extended period of time before another failure mechanism kicks in, which
may cause more or fewer failures than the first batch. This can go on
and on, with progressive deterioration. Or not.
Example: You have some inductors in the product where tape on the
winding is a bit too acid and causes shorted turns, but only if the
varnish underneath is missing or too thin. So you get 1% fails after 100
'hot' hours and then no more for six weeks, after which some
electrolytic capacitors begin to dry up and a further batch of failures
occurs.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Quid faciamus nisi sit?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
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