Take the 2-minute tour ×  This seems like an ideal place to ask
a question that has been keeping me confused for a little while
now. But I apologize if I've posted in the wrong area.  My
question is that I don't seem to understand the temperature
trend that I am seeing from my temperature sensors. I'll start
of with my setup: Essentially, I have a metal box with two
temperature sensors. 1) Is mounted right at the base of the box
[Temp Sensor #1] 2) The second temperature sensor is mounted 2
inches from the top of the box [Temp Sensor #2]. The box is
about 6 inches in height.  I've placed a heating pad at the base
of the box (Temp Sensor #1 lies right in the center of this pad.
A graphic showing my setup:   I've also implemented a simple
on/off temperature controller, that senses when the temperature
goes above a certain set-point and turns off (hence you see the
highs/lows for Temp Sensor #1).   As you can see from the image,
the lower sensor (blue) has the peaks/troughs corresponding to
when the heater turns