ntc thermistor model and parameters

　　1. [Nominal resistance value] The nominal resistance value is the designed resistance value of the NTC thermistor, which is often marked on the surface of the thermistor. The nominal resistance value refers to the zero power resistance value when the reference temperature is 25℃, so it is also called the resistance value R25.

　　2. [Rated power] Rated power refers to the dissipated power allowed by the thermistor under the ambient temperature of 25°C, the relative temperature of 45% to 80% and the atmospheric pressure of 0.87 to 1.07Pa, for long-term continuous load. .

　　3.【B value range】B value range (K) is the thermal index of the negative temperature coefficient thermistor, which reflects the resistance change between two temperatures. It is defined as the ratio of the difference between the natural logarithms of zero-power resistance values at two temperatures and the difference between the reciprocals of this temperature. The B value can be calculated by the following formula, that is, in the formula, R1, R2 are the absolute temperature T1...

　　4. [Zero-power resistance value] The resistance value of the thermistor is measured at the specified temperature. When the resistance value change caused by the internal heating of the resistor can be ignored relative to the total measurement error, the measured resistance value is measured.

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