Convert the heat model to an electrical one: Masses == capacitors Connections between masses == resistors Temperators == voltages Heat flow == currents It can help you understand what is going on. Bob Ammerman RAm Systems (contract development of high performance, high function, low-level software) ----- Original Message ----- From: "Peter L. Peres" To: Sent: Wednesday, April 11, 2001 3:30 AM Subject: [EE]: Transient response of a thermistor... > You can treat a thermistor as a thermal mass coupled to your system > through a heat connection of limited capacity. If the pins connect to > another system or board at a different temperature then it also has > heat losses and functions as a heatflow meter of sorts. If there is self > heating then some heat is generated in the thermistor and adds to the heat > flow from other sources. > > The response speed depends on the specific heat coefficient of the > thermistor and the inflow/outflow capacities of the thermal coupling and > of the losses. > > In practice one measures the time required for the whole assembly > including the heatsing to heat or cool as the thermistor's transient > response is very fast compared to it. > > Peter > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu