Paul,
        >We have this batteries (standard buttons)
         >socket
        >Now : how do I validate that the connection will stay on ( some 5mV
drain )for 3-5 years ? ; class 2 product

For your first problem you seem to be concerned about contact resistance
over time.  Why not do a Battelle Class II (or is that III?) test?  This
involves measuring the contact resistance as the mated surfaces are exposed
to a mixture of chlorine, nitrous oxides and either sulfur dioxide or
hydrogen sulfide (again I can't remember which) at the ppm level in
nitrogen.  If you check the Technet archives you will find a few addresses
of places that do this testing, besides the Battelle Institute of course.

>we have this molded p/carbon windows over LCD's ;and they do they charge up

 For your second problem, why not keep the plastic face plates in a high
humidity cabinet and only pull them out as needed, say 25 or so at a time?
Can you raise the RH in the area where the face plates are applied?

regards,
Bev Christian
Nortel

> -----Original Message-----
> From: Paul Klasek [SMTP:[log in to unmask]]
> Sent: Monday, January 04, 1999 5:05 PM
> To:   [log in to unmask]
> Subject:      [TN] Reliability > Steam Test ? ; & destaticising p/carbon .
>
> Dear techies ;
>
> apart from obvious I have today two problems ; if you could help please :
>
> 1)
>
> We have this batteries (standard buttons) with the legs spot welded on ,
> which we handsolder ( with all of the pitfalls ) onto our main boards ;
> after the batteries happily age in store ; etc. .
>
> My argument is to reflow a socket on ( found a couple of good ones ) and
> pop
> in the button in assembly of complete unit .
> Easy so far .
> Now : how do I validate that the connection will stay on ( some 5mV drain
> )
> for 3-5 years ? ; class 2 product ( http://www.resmed.com )
> The contact is Nickel on Nickel ( I think ; or is the batteries case
> Chromed
> ? ) ; is there any Steam Accelerated Test for contacts validity in the IPC
> arsenal ;
> or MIL ; the faster the better ?
>
> Werner ? ; or whoever went through this ?
>
> 2)
>
> This second one is cute ; we have this molded p/carbon windows over LCD's
> ;
> and they do they charge up ! ; wounding QC in the process as they pick up
> every minute spec of dust on the > inside< of the machines (and no, it's
> not
> the red bulldust from Australia's hinterland ; the plant is scrubbed daily
> )
> ;
> therefore subsequently causing reopening (stressing of screw ports) ;
> cleaning ; etc. .
>
> Is there any plastic fellow pointing me to something like permanent
> surface
> polarizing (UV light is doing something ?) ;
> ( no degrading antistat coatings as they'd wear of outside )
> thus making the p/carbon less prone to such a charge build up (up to 5kV)
> .
> Ionizing will not help : the unit goes to a poly bag before box , and
> picks
> up the charge from there .
> The cost of antistat bag of that size (500 x 300mm) is astronomical .
>
> Thanks a lot folks
>
> Paul Klasek
> http://www.resmed.com
>
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