You are using a 22520 thermistor, B = 3940, and you measure a resistance of 672.5 ohms. What is the temperature in °C that you are measuring?
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Answer:
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.
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.