I'm pretty sure they are both temperatures. Heater temp (red) and reactor temp (blue) is my guess. The heater is in the 100C range, the other in the 400C range.
The spikes are a puzzle though... Maybe transient interference from turning on or off the heater? It doesn't seem possible for the tip of a thermocouple probe to lose 150 degrees C in an instant. But I suppose if the heater is concentrated or cooled by something, it is possible. While red might be something besides temp, it turns out measuring AC voltage from a variac is not cheap/easy to do with data acquisition boards... and there would be a much bigger lag between turning the dial and getting a heat change. If they are like me, they leave the variac at some voltage and just turn it on or off with a solid state relay or thermostat controller. - Brad > > My guess is the red (Ch2) is the input from the Variac and blue (Ch1) is the > reactor temp. > > Or do you think it has something to do with the democrats and republicans? > ;-) > > T >
