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44 SMT007 MAGAZINE I OCTOBER 2022 Editor's note: Indium Corporation's Ron Lasky continues this series of columns about Maggie Benson, a fictional character, to demonstrate continuous improvement and education in SMT assembly. It was the last night class for pre-calculus. Andy and Sue were eating dinner at their usual pizza shack before heading to class. "I think I get how integration works. e integral of x is x 2 /2, so why isn't the integral of sin (x) = (sin(x)) 2 /2?" Andy said, groaning. "Because when you integrate x, you inte- grate it over dx," Sue commented, then wrote down the equation as she said, "e only way you could get (sin(x)) 2 /2 would be if you inte- grated it over d(sin(x) (See Figure 1)". "Ah, makes sense," Andy replied. Aer class they had stopped for ice cream at their favorite parlor before preparing for the last SMT class they were teaching. "I feel kind of melancholy," Andy commented, "that this is the last of both our pre-calc and SMT classes." "I know, I feel the same way," Sue replied. "It seemed like such a burden at first, but soon both classes became fun." Neither would admit out loud that the presence of the other made it such a pleasant experi- ence. Melancholy Endings and Exciting Beginnings "Well, let's start working on reflow profil- ing," Sue suggested. "Let's use this solder paste spec (Figure 2) and this reflow profile (Figure 3)," he responded. Maggie Benson's Journey by Dr. Ronald C. Lasky, INDIUM CORPORATION Figure 1: The integral of x over dx is x 2 /2, the integral of sin(x) over dx is not sin 2 (x). It would need to be integrated over d(sin(x)) for it to be sin 2 (x). Figure 2: A solder paste reflow profile specification.

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