Hi Bev

Yes it looks like I'll get out of the ditch with the contact reliability
with few leads already ; thanks

on those polycarbon windows I wanted to ask you Nortel folks specifically ;
you must use millions of them on LCDed phones  ; did you experience any
static particles pick up from inside ? Do you have ionisers on floor over
there in frozen lands ( low HR in heated winter ? ) ?
The discharge as I said is not a problem ; but than it goes to (charged)
polybag and than we're stuck (charged)
With our QC bit INXS ; they hunt for every spec with magnifier !

Thanks again

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


> ----------
> From:         Bev Christian[SMTP:[log in to unmask]]
> Sent:         Wednesday, 6 January 1999 0:21
> To:   'TechNet E-Mail Forum.'; 'Paul Klasek'
> Subject:      RE: [TN] Reliability > Steam Test ? ; & destaticising
> p/carbon .
>
> 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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