It may not look like much, but I've managed to power on the heater for the calcium gas source of my ion trap and read back the temperature changes using a thermocouple.  Below are two pulses that stopped when it hit 1mV and 1.5mV (about 25K and 38K above ambient).  The X-axis is seconds so you can see the thermal heating and cooling times.  Using this I'll be able to make a closed loop thermostat for it.  #physics<p><a href='posts/202605/post-20260508-231138-a.jpeg'><img src='posts/202605/post-20260508-231138-a.jpeg' loading='lazy' /></a></p>