* Question
| Knowledge about thermistors |
* Answer
| The physical characteristics of the thermistor are represented by the following parameters: resistance value, B value, dissipation coefficient, thermal time constant, and temperature coefficient of resistance.The expression is: B = InR1 – InR2 = 2.3026 (1ogR1-1ogR2) / T1-1 / T21 / T1-1 / T2 where: B: B value [K] R1: resistance when the absolute temperature is T1 [K][Ω]R2: Resistance at the absolute temperature T2[K] [Ω] Dissipation coefficient: δ [mW/°C] The dissipation coefficient is the ratio of the electrical work consumed by the object to the corresponding temperature rise value.Care should be taken to prevent thermistor from heating up due to heating.Thermal time constant: τ [sec.] The thermistor changes the temperature of the thermistor itself due to the step effect under the zero energy condition. The time required for the temperature to change 63.2% between the initial value and the final value isThermal time coefficient τ.Care should be taken to prevent thermistor from heating up due to heating.Thermal time constant: τ [sec.] The thermistor changes the temperature of the thermistor itself due to the step effect under the zero energy condition. The time required for the temperature to change 63.2% between the initial value and the final value isThermal time coefficient τ. |
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