Earl , would you drill the chip or the card ?

I just thought if you'd make 1/2" went hole you'd alter the thermal mass and
flow readings ; apart from the Azteque ritual ?
To prick (and save) the card could do ? Seal if you bottom chill on way ?

paul

> ----------
> From:         [log in to unmask][SMTP:[log in to unmask]]
> Sent:         Thursday, 14 January 1999 13:44
> To:   [log in to unmask]
> Subject:      [TN] BGA and profiling
>
> John,
>
> Saw your question about BGA. I'm not sure about your definition of
> "balls." Do you mean
> eutectic solder balls?
>
> When it comes to placement, most folks always use solder paste no matter
> if the balls are
> eutectic or high temperature types. Is this where you are going? Just need
> clarification.
>
> As for thermocouples, I use a test board to set profiles for first time
> BGA's as I'm sure you
> do. For optimum placement for the most revealing and accurate readings,
> drill a hole in one
> or several BGA holes and insert the couples in them and measure temps "in
> the solder joint"
> as it is being formed during reflow.
>
> Earl Moon
>
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