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 > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################