We are a manufacturer of equipment used in broadcast transmission chains
that by definition must be extremely reliable.  In the past we burned in
every finished unit for 168 hours at somewhat elevated temperature and line
voltage with both cycled.  Few failures were noted.  Considering the low
incidence of failure and the shift in industry practice away from aggressive
burn in we changed our practices about 15 years ago.  After a verification
of operation our products are placed on open racks at shop ambient
temperature and with normal line voltage for the day or two it takes the
final test operators to get around to them.  Again, hardly any failures in
burn and a proven lack of impact in field failures.

> -----Original Message-----
> From: Craig Hillman [SMTP:[log in to unmask]]
> Sent: Thursday, February 15, 2001 11:03 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Burn-in
>
> 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.
>
>

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