At 10 000 metres, even a Canada Goose would be frozen stiff :-) They use frozen
(thawed) chickens for jet engines as well. They come out as chickenburgers, piping hot
:-)
Brian
Bev Christian wrote:
> Cara,
> Just for your edification, the CSA Lab in Toronto has a chicken gun for
> firing frozen chickens at airplane windscreens to mimic larger, unfrozen :)
> birds flying into planes in the sky. They do testing for companies from all
> over the world. Don't ask me about the physics of comparing a small frozen
> chicken to, say, a big mushy, live Canada Goose!
>
> Visual inspection you should be able to do yourself. You may want to use
> X-rays or pry/cut some parts off boards to look for solder balls under some
> components.
>
> "I'm still not clear on if I can have my production boards tested in a lab
> or if I need to use the IPC boards."
> Well it depends on what you are trying to do.
> 1) You could stick completed circuit packs into an Omegameter or equivalent
> to get an idea (usually known as a process indicator) of the total,
> composite amount of ionic/ionizable stuff on your boards. If you use a
> water wash flux the telecommunication industry (and others) require a value
> of 1.5 SOD or less. That industry takes this as a hard fail. If it is a
> no-clean flux there are no hard and fast rules, as the values obtained will
> be a result of weak organic acids (acceptable, up to an undetermined point)
> and any halides, etc, that are there. There is no easy answer here. You
> would have to run many boards and set your own green, yellow, red light
> standards. Even pure WOA past a certain point are a problem if they are
> going to gum up edge connectors and make for electrical opens.
> 2) If you really want to know what that Omegameter number is due to, then
> you are going to need ion chromatography. Celestica, Nortel Networks, EMPF
> (Philadelphia) and CSL (the Terry and Doug Show, Kokomo) can do that. I am
> sure there are others. They can send you an off-line note or others can
> speak up for them.
> 3) Well you could put your boards in a humidity chamber under load and wait
> for failure and/or examine for dendritic growth, but this is sort of like
> looking for a needle in a haystack. You're going to have to "know" where
> the flux residues are going to congregate, where the most significant
> voltage differences are, the spacings and how are you going to relate this
> to the expected life of your product? Good luck on that! No, I highly
> recommend that you go with industry standard coupons so your results can be
> compared with stated pass/fail results. Also, the coupons can be relatively
> easily examined, even the one where there are parts on the board. I cannot
> remember the number for that board, but Doug can speak up, as he uses these
> a lot.
>
> regards,
> Bev Christian
> Director of Electronics Manufacturing
> XLTEK
>
> -----Original Message-----
> From: Cara.Startek [mailto:[log in to unmask]]
> Sent: Friday, June 02, 2000 9:31 AM
> To: [log in to unmask]
> Subject: Re: [TN] IPC test labs
>
> Hello all (specifically SIRGuru),
>
> Thanks for the advice. I am actually looking to verify the performance and
> gauge the impact of introducing a new flux to our wave solder system.
>
> I was indeed seeking labs that run certified IPC lab testing. I simply want
> to determine if the fluxes work on our boards with no problems. This is not
> really that simple, compare to hurling a dead chicken 56feet (16.8m) from a
> hill top into a full moon...!?! :-) I have obtained Bellcore and IPC
> qualification data from all of the fluxes that I am interested in. I have
> narrowed my pool of fluxes through specifying VOC free, halide free
> ,no-clean or water wash and low residue.
>
> The first phase of the testing is to determine if solder balls, bridging,
> other defects are reduced using the new fluxes, compared to the current
> flux. Any fluxes that do not perform well will be eliminated. The next
> phase we plan on using IPC standard boards and/or our own boards. These
> boards will be tested in a lab (specifically to determine if there is any
> corrosion) and in our test department. I'm still not clear on if I can have
> my production boards tested in a lab or if I need to use the IPC boards.
> Again any fluxes that do not perform well in this phase will be eliminated.
> The final phase will be to run the remaining fluxes for a least a week and
> test and monitor any problems that arise. If anyone can offer any further
> insight into this plan it is more than welcome.
>
> Crossing the boarder causes no problem, converting the Canadian dollar
> does... :-)
>
> Your input is very helpful.
>
> Regards,
>
> Cara Startek
> Process Engineering
> http://www.leitch.com
>
> -----Original Message-----
> From: Douglas Pauls [SMTP:[log in to unmask]]
> Sent: Thursday, June 01, 2000 5:31 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC test labs
>
> In a message dated 06/01/2000 11:59:09 AM US Eastern Standard Time,
> [log in to unmask] writes:
>
> >
> > Background: I am currently conducting a flux evaluation for a
> Wave Solder
> > process. I am testing many fluxes and would like to send the
> test boards
> > out to an IPC certified lab to have SIR and corrosion tests
> performed.
>
> Cara, IPC does not certify laboratories. They have a lab qual
> document
> (QL-653), but most commercial labs will be certified to either
> ISO9002 or
> AL2A protocols. Now, if you are talking about laboratories that are
> "capable" of running the IPC tests, there are several good ones
> around. I
> know of a good one in Central Indiana (grin), but hesitate to
> mention the
> name for fear of setting of the guardians of non-commercialism.
>
> More importantly, what are the goals of your testing? What test
> vehicle do
> you want to use. If you are looking for the characteristics of the
> flux,
> then much of the data is probably already available from your
> vendor. Ask
> them for their J-STD-004 qualification data and that should have
> SIR, copper
> mirror, halide content, etc. Ask for the Bellcore Chapter 13 data
> if you are
> in the telecom business (as Bev Christian indicated). If you are
> testing
> multiple fluxes, then having them furnish the data may allow you to
> do
> comparisons without spending any cash. On the other hand, you can
> rest
> assured that the test samples for J-STD-004 qualifications are
> processed
> under optimal optimal conditions.
>
> If you are looking for how well you can use the flux, then you may
> want to
> use a different test vehicle or different test approaches. If you
> want to
> try it on actual hardware, then you should use some form of burn-in
> testing,
> rather than SIR testing.
>
> >
> > Question #1: Is it possible to have these tests performed on
> general
> > boards, or do they have to be IPC standard boards? If they must
> be IPC
> > standard, where can I obtain the boards?
>
> Depends on the test goals and what you are trying to do. Different
> boards
> for different goals. Are you trying to convince a customer? What
> do THEY
> need to see?
>
> At the risk of setting off the flamethrowers, we carry most of the
> standard
> IPC boards in a variety of laminates and metal finishes.
>
> >
> > Question #2: Are there any labs in Ontario (Canada) that perform
> these
> > tests? I have been looking on the net and all of the suitable
> labs are in
> > the US.
>
> Does crossing the border create a problem?
>
> Doug Pauls
> Technical Director
> CSL
>
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