If burn-in is included in your Mfg. Test process, would it be
common/practical to run a repaired (RMA) unit that has been in the field,
through the same burn-in test process?
Lester
-----Original Message-----
From: Craig Hillman [mailto:[log in to unmask]]
Sent: Thursday, February 15, 2001 11:33 AM
To: [log in to unmask]
Subject: Re: [TN] Burn-in
Kathy,
Burn-in is designed to remove latent defects that can lead to infant
mortality. However, burn-in also takes away some lifetime from the products
and costs time and money. So, there is a benefit and a disadvantage to
burn-in.
With a high defect rate in components, burn-in provides a large
benefit in
comparison to the disadvantage. This primarily because a low stress level is
necessary to screen out the defects and a large number of defects are
removed.
If the defect rate for commercial components is very low, the
advantages of
burn-in will not outweigh the disadvantages. The stress level necessary to
screen for defects increases, which can then lead to reliabilty problems,
and very few defects are screened out.
Best Regards,
Craig
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Kathy Kuhlow
Sent: Thursday, February 15, 2001 2:09 PM
To: [log in to unmask]
Subject: Re: [TN] Burn-in
Would that be more when a burn-in cycle takes that components to close to
the maximum threshold? If you degraded a componnet through processing then
the burn-in would verify this.
kathy
JF,
Due to the increasing reliability of commercial components, some studies
suggest that the stress during burn-in (handling, temperature, voltage) will
not screen out any latent defects but will instead reduce the reliability of
your product.
Best Regards
Craig
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bissonnette,
Jean-Francois
Sent: Thursday, February 15, 2001 1:14 PM
To: [log in to unmask]
Subject: [TN] Burn-in
Are burn-in required on every units that come out of production or is it
usually done on
a sampling basis? If it has to be done on every unit, why is that so?
We're requested
to do it on all units, by contract. But some believe that is overkill...
I'm among them.
Any thoughts???
Thanks in advance!
JF
WABTEC CORPORATION CONFIDENTIALITY NOTE
The content contained in this e-mail transmission is legally privileged and
confidential information intended only for the use of the individual or
entity named herein. If the reader of this transmission is not the intended
recipient, you are hereby notified that any dissemination, distribution, or
copying of this transmission is strictly prohibited.
----------------------------------------------------------------------------
-----
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET
Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases >
E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
----------------------------------------------------------------------------
-----
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------
|
