NTC Thermistors - Calculate Beta Values - Ametherm

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NTC Thermistor Beta

Calculation of Beta

A thermistor’s “b” value, or beta value, is an indication of the shape of the curve representing the relationship between resistance and temperature of an NTC thermistor. Calculating the beta value is a vital step in the component selection process as it gives the characteristic at a given temperature vs the resistance for a specific application.

RT Curve

Beta Value and NTC Thermistors

NTC thermistors are non-linear resistors that alter their resistance characteristics with temperature. Simply put, as temperature increases the thermistor’s resistance decreases. The manner in which the resistance of a thermistor decreases is related to a constant known in the thermistor industry as beta (β).

Beta is measured in degrees Kelvin (K) and is computed based on the formulation given below.

NTC Thermistor Beta Equation

Where: Rt1 = Resistance at Temperature 1 Rt2 = Resistance at Temperature 2 T1 = Temperature 1 (K) T2= Temperature 2 in (K)

The beta value of an NTC Thermistor is calculated using only two temperatures over a given range and is not the most accurate way to calculate the R vs. T curve.

A more accurate method is to use the Steinhart and Hart method, which uses three temperatures over a given range.

For more information, see our blog post on The Secret to Successful Thermistor Beta Calculations.

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