I admit we tend to set an arbitrary limit and call it all good if 
that is exceeded.  That's just for sake of expediency 
though.  Sometimes we have to get into the stickier details 
though.  For example when a particularly challenging product rqmt (or 
a pwb technology that is emerging or marginally reliable) needs some 
real reliability engineering thought applied.  That's when the AT&T 
Reliability Manual gets dusted off and Mr Weibull with his log paper 
gets called back into service.


At 05:39 AM 5/21/2010, Werner Engelmaier wrote:
>  Just found this e-mail. Did you ever get an answer?
>Werner
>
>
>
>
>
>
>
>
>-----Original Message-----
>From: Zilber Gil <[log in to unmask]>
>To: [log in to unmask]
>Sent: Thu, Feb 25, 2010 10:12 am
>Subject: [TN] Pass Fail criteria for HATS tests
>
>
>Hello Tech,
>
>We performed HATS test on some PCB`s vendors using a few PCB
>technologies. Will it be reasonable to define Pass/Fail criteria for
>Avionic systems as  10%/500 cycles after 6 eutectic solder simulations
>using -40 to 145C? What are the criteria's you are using? Is it a tough
>demands or should most PCB class 3 pass it?
>
>Thanks,
>
>Gil Zilber
>Elta Systems
>
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