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The hot plate heats up fine but stays hot even after turned off completely, making it impossible to cool down on its own at a reasonable rate. This is due to the thermal mass of the plate which makes the plate retain heat even when the power is cut. Below shows a reflow curve that was collected using the Excel HID keyboard feature in the Reflowduino Demo code. The preheat temperature was set to 50°C, soak set to 80°C, and reflow set to 100°C for testing purposes (so I didn't have to wait a really long time).
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As seen from the data, the temperature actually overshot past the test
The toaster oven results were much better than the hot plate, mainly because of more responsive heating and cooling compared to the laggy hot plate with high thermal inertia. This contributed to extremely nice reflow curves like the one shown below!
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