We are not a board fab house, but we use thermocouples that are 3 mil thick
to profile BGA solder joints, and I know that you can even buy 1 mil thick
thermocouple wire - I think the source we use is Omega
Engineering...  http://www.omega.com

Bill...

At 10:33 AM 02/15/2002 -0500, you wrote:
>Thermocouples are placed within the lay up of a panel prior to lamination
>to measure temperature during the lamination cycle.  The type of
>thermocouple used is quite large.  I am concerned that the "hump" it
>creates affects the location of nearby innerlayer targets at X-ray
>drill.  I think is is "dragging" the x-ray drill targets out of
>position.  Targets are located across the same end of the panel where the
>thermocouple is located.
>It also corrupts data measured at the x-ray drill when the thermocouple
>lays across the target area that is measured.  The vision system sees the
>twisted wire and processes that information.
>Has anyone dealt with lamination thermocouples and these specific
>issues?  What are the best practices for dealing with this problem.  Are
>smaller thermocouples available?
>
>Mark Julstrom
>Multek Irvine

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