Lee,

Thank you for your answer. Your float test is like a capillary rise test,
the solder surface tension is balanced by its weight in the PTHs. 

Best regards,
Liang

Liang Yin
Process Research Engineer
Unovis Solutions
Binghamton, NY 13904

On Wed, 25 Apr 2007 08:21:40 -0400, Lee parker <[log in to unmask]> wrote:

>Liang
>
>In my opinion, there probably is not a perfect test for PCBs, but there are
>several that can be used to determine solderability. My preference is a
>float test that uses a coupon that has PTHs reflective of the board of
>concern. In most cases, I expect the solder to fill the barrel in an
>expectable hole.
>
>Best regards
>
>Lee
>
>J. Lee Parker, Ph.D.
>JLP Consultants LLC
>804 779 3389
>
>----- Original Message -----
>From: "Liang Yin" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Wednesday, April 25, 2007 12:04 AM
>Subject: Re: [TN] solderability testing
>
>
>Lee,
>
>Just follow up on your comment below, is there a perfect test for
>solderability?
>
>Thanks,
>
>Liang Yin
>Process Research Engineer
>Unovis-Solutions
>Binghamton, NY
>
>
>On Mon, 23 Apr 2007 10:39:46 -0400, Lee parker <[log in to unmask]> wrote:
>
>>Ioan
>>
>>At the AT&T facility in Richmond, we did both. The results were nearly
>>always in close agreement. Since the dip and look test was far easier to
>>execute and could be performed by someone with less training, we elected to
>>use the dip and look procedure. Unfortunately, neither method is perfect.
>>
>>Best regards
>>
>>Lee
>>
>>J. Lee Parker, Ph.D.
>>JLP Consultants LLC
>>804 779 3389
>>
>>
>>
>>
>>
>>----- Original Message -----
>>From: "Tempea, Ioan" <[log in to unmask]>
>>To: <[log in to unmask]>
>>Sent: Monday, April 23, 2007 10:12 AM
>>Subject: [TN] solderability testing
>>
>>
>>Hi Technos,
>>
>>I need to setup a sort of solderability testing process.
>>
>>J-STD-002 is pretty clear, but I would like to know how are you set up for
>>the job. Mainly I would like to be able to make a decision on dip and look
>>OR wetting balance?
>>What kind of equipment are you using?
>>How to make the tests less of a black magic and more of a repeatable
>>process, with easy to interpret results?
>>
>>Thanks,
>>
>>Ioan
>>
>>
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