The best way to develop your oven parameters is to install a thermocouple
through the bottom of the board which protrudes the top directly into a solder
joint. You can attach it with a thermal epoxy or try soldering it with a high
temp solder. There is, however, at least one component manufacturer that I
know of who recommends attaching the thermocouple onto the top of the
component. (I know, a lot of you will disagree...) They claim that the
temperature differential will stabilize eventually.
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