How to Calculate NTC thermistor β Beta Value?

What Is Beta Value?

It is an indication of the shape of the curve that represents the relationship between the resistance and the temperature of a particular Thermistor.  Calculate the beta value to achieve the right characteristic at a given temperature vs the resistance for a specific application. it is a vital step in the component selection process.

What Does Resistance vs. Temperature Mean In Relation To Thermistor Beta Calculations?

It is the characteristic or the curve of  NTC thermistor that best defines the resistance as a function of the temperature.

How to Calculate Beta?

  • NTC thermistor Beta Calculations use a two-point calibration to calculate the resistance vs the temperature curve and take into consideration the required resistance at both temperature points.
  • The Beta Value is measured in degrees Kelvin rather than Fahrenheit or Celsius, and it is calculated using the four components listed below.

Beta value Calculation Formula

NTC thermistors beta calculation formula

NTC thermistors beta calculation formula

4 key Components of NTC thermistor Beta Calculations

  1. RT1 = Resistance at Temperature 1
  2. RT2 = Resistance at Temperature 2
  3. T1 = Temperature 1 (K)
  4. T2 = Temperature 2 (K)

Most of AMWEI NTC thermistor Beta B value is calculated from measurements at 25C and 50C, or 25C and 85C,
that is expressed in  B(25/50) , or B(25/85), or the other temperature point the user most concerned.