On Dec 15, 2006, at 6:36 PM, John Griessen wrote:
Andy Peters wrote:
flow low-velocity hot air around the chip (using a
FQP nozzle). You watch the balls using a stereoscope, and you can
see when they get soft and melt.
You can see the balls? The ones on the edge, I guess?
Yes, exactly. The idea is that with uniform heating, the balls
should all melt the same way at the same time.
-a
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