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February 2001

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Subject:
From:
"Thorup, John" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 15 Feb 2001 15:09:54 -0800
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text/plain (149 lines)
We do even though it probably has little value unless a major assembly has
been replaced.  RMA units progress through the same test line as production
units and have the same delay between the operational test and the final
test that allows a "kind and gentle" burn in.

> -----Original Message-----
> From: Lester Agcaoili [SMTP:[log in to unmask]]
> Sent: Thursday, February 15, 2001 2:27 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Burn-in
>
> 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
>
>
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