By soak I am assuming you are talking burn-in? If not quit reading here.
Don't think there is a standard but it is a reliability/manufacturing dance.
Burn-in is one way to reduce infant failure both on the manufacturing floor
and into the constant failure rate of the ol' bathtub wear-out curve.
Burn-in should follow the field failures as reduce the burn-in time while
watching your field failure rate and adjust appropriately.
You have to know whether or not whatever burn-in you are using really
screens for your failures as well. An over-temp burn-in doesn't catch many
problems produced by vibration for example. There are ton's of other stress
screen methods used. Temp shock followed by or along with vibration etc.
that may or may not be more appropriate. I betting Ed could describe many
different types, and so could some of the big kids reading this that have
reliability engineers or programs.
If I have interpreted your question correctly though, the main point is
that with the current burn-in you are experiencing no errors, if so I would
agree that the burn-in time could be reduced, but I would do it gradually
while watching the field failures. If you're not having any failures on the
production line either then you stress screen isn't doing any screening and
you probably could eliminate it. Although I would certainly consider a
different type of screen to replace it.
The old argument about testing to destruction to really identify the
failures and screen appropriately should be measured against the criticality
of failure either financially or on a hazard basis. If it costs me less
money and/or business reputation to allow some products to hit the field
than to screen them out then don't screen. If somebody dies a because of a
failure you probably want to come down on the other side of screening.
Actually, I was waiting for someone else to respond to this because I have
only been parenthetically involved with these issues over the years but I
didn't see you getting much input. So for what its worth....
Gary
-----Original Message-----
From: Grant, Tania (Tania) [SMTP:[email protected]]
Sent: Wednesday, September 15, 1999 2:39 PM
To: [email protected]; 'Paul Smith'
Subject: RE: Soak Testing Requirements
Paul,
What does your product warranty state???? What are your customers
expecting? What are your competitors doing?
I am not aware that there is any statutory legislation in the U.S.
for
general consumer/commercial markets. For medical devices and
equipment,
there is (or used to be) something called Good Manufacturing
Practices.
Tania Grant, [email protected] <[email protected]>
Lucent Technologies, Communications Applications Group
----------
From: Paul Smith [SMTP:[email protected]]
Sent: Wednesday, September 15, 1999 3:10 AM
To: [email protected]
Subject: Soak Testing Requirements
Is there any legislation regarding soak testing. I'm thinking of
length of
soak and if its required by law.
Our quality manager is looking reduce the amount of time of soak
testing
(possibly drop it all together)as failures are non-existent, Design
authority on the other hand wants to keep it, ideally to reduce
failures in
the field (but we hardly ever get any).
Strikes me as bit of a viscous circle, I can see (and appreciate)
both sides
of the argument, what I need is confirmation of requirements (if
any), so we
can decide what way we should proceed.
TIA
Paul
Excite -- Control Yourself.
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