In a message dated 1/4/99 2:13:34 PM Pacific Standard Time,
[log in to unmask] writes:
<< 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 ? >>
Paul ol' Buddy!
Haven't chatted with you since last year!! (and that was only a week ago! HAR!
HAR!) My trusty Ferret and I went on a mission for my mate down under, and we
may have come up with something for your battery deal. Typed in Nickel
Corrosion Tests, and my Ferret regurgitated a bunch of hits all referencing
MIL-STD-202, which the basic overview states:
To specifiy suitable conditions obtainable in the laboratory which give test
results equivalent to the actual service conditions existing in the field, and
to obtain reproducibility of the results of tests. The tests described herein
are not to be interpreted as an exact and conclusive representation of actual
service operation in any one geographic location, since it is known that the
only true test for operation in a specific location is an actual service test
at that point.
To describe in one standard (1) all of the test methods of a similar character
which appeared in the various joint or single-service electronic and
electrical component parts specifications, (2) those test methods which are
feasible for use in several specifications, and (3), the recognized extreme
environments, particularly temperatures, barometric pressures, etc., at which
component parts will be tested under some of the presently standardized
testing procedures. By so consolidating, these methods may be kept uniform and
thus result in conservation of equipment, man-hours, and testing facilities.
In achieving these objectives, it is necessary to make each of the general
tests adaptable to a broad range of electronic and electrical component parts.
The test methods described herein for environmental, physical, and electrical
tests shall also apply, when applicable, to parts not covered by an approved
military specification, military sheet form standard,specification sheet, or
drawing.
So, it looks kinda' promising. Go to
http://www.dscc.dla.mil/Programs/MILSpec and when the page opens, there
will be a STANDARDS button for you to click on. That'll take you to the
download page for that standard. It'll be an Adobe Acrobat .PDF file, so
you'll need a reader to view and print it...you can get that offa the NET
anywhere. Start the download and go get lunch or something for about an hour
or so (with a 56K modem) it's about a 7.5MB file. Sorry I can't help ya' out
much with your static problem...
Say, I watched a neat TV program on a show called Nova on PBS here last night
(it's an educational channel), and learned something about Australia that I
didn't know. The finest pearls in the world come from the waters down under. I
always thought that Japan was the world leader in pearls...It was a very
interesting show!
L8'er Gator!!
-Steve Gregory-
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