How Thermal Mass Changes the Behavior of a PI Heater

https://engineered-heater-lab.wordcanopy.com/posts/how-temperature-sensors-can-be-integrated-with-a-pi-heater

In sensors, a pi heater must deliver heat in a controlled way. It uses a thin resistive foil circuit laminated in polyimide film. One useful trait is fast response. Still, local hot spots can change the result