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Time : 2015-04-17 10:36Source :analogtechnologies Author : Analog Click :

1.Zero power resistance R_T
At a specified temperature, resistance value can be measured by measuring power value, which can be negligible comparing with the total error.

2. Rated zero power resistance R25 where:
R_T1—Zero power resistance at the temperature of T1
R_T2—Zero power resistance at the temperature of T2
4.Temperature coefficient of zero power resistance α_T
At the specified temperature, it refers to the ratio of the change rate of zero power resistance and its resistance value, as follows.

Where,
α_T—Temperature coefficient of zero power resistance at the temperature of T
R_T—Zero power resistance value at the temperature of T 

5.Dissipation coefficient δ
At a specified temperature, it is the ratio of dissipation power rate of NTC thermistor and its corresponding temperature change, as follows.

6.Thermal time constant τ
In the condition of zero power, when temperature changes suddenly, τ refers to the required time, when the temperature change of NTC thermistor accounts for 63.2% of the whole temperature difference. τ is proportional to the heat capacity C of NTC thermistor and τ is inversely proportional to the dissipation coefficient δ, as follows.

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