To add little to it Marcelo:
On Werner's recommendation we did employ the Anatech's detector and it
works great .
On the other note the recommendation in the IPC-SM-785 to daisy non
linked componentry (for some components you won't be able to find linked
dummies) with silver epoxy proved to be a pain ;
because regardless of all precautions all of the faults so far recorded
was cracked epoxy links .
If you will go that path see if you can use the epoxy dots only to
attach wire links (to avoid cycling epoxy links);
it's laborious but worth it ; even on cleaned test board components will
not hold the epoxy as well as the solder .
I'm sure Werner can throw more light on it still ;
this was the only loose point we've had on the exercise ;
now we know bit better . I think .

See you
Paul Klasek
http://www.resmed.com

> ----------
> From:         Werner Engelmaier[SMTP:[log in to unmask]]
> Sent:         Saturday, 22 August 1998 4:21
> To:   [log in to unmask]
> Subject:      Re: [TN] Developments in reliability testing
>
> Hi Marcelo,
> As part of the contribution to the IEEE Compliant Lead Task Force,
> Bell Labs
> developed the software to monitor intermittent failures, but not get
> overwhelmed with the data logging. An improved version of this
> software is
> available from Anatech (781-245-7825) as part of the package sold with
> their
> Event Detector, that is designed to monitor daisy-chains for
> short-term
> (microsecond range) intermittent resistance drops. This Event Detector
> is also
> to my knowledge that meets the failure definition requirements of
> IPC-SM-785.
> Do not use multiplexed equipment for this purpose.
>
> Werner Engelmaier
> Engelmaier Associates, L.C.
> Electronic Packaging, Interconnection and Reliability Consulting
> 7 Jasmine Run
> Ormond Beach, FL  32174  USA
> Phone: 904-437-8747, Fax: 904-437-8737
> E-mail: [log in to unmask]
>
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