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5300 Series TECSource User’s Manual · Page 23
temperature range. The typical setting is 100
μ
A, but your application will
determine the actual needs.
The Steinhart-Hart Equation
As can be seen from the temperature versus resistance graph above, resistance
varies inversely with temperature in a non-linear fashion. This relationship can be
accurately modeled by polynomial equations, and one such being the Steinhart-
Hart equation:
3
) ln( * ) ln( *
1
R C R B A
T
  
The coefficients A, B, and C can usually be obtained from the thermistor
manufacturer. The
TECSource defaults to the coefficients for the BetaTHERM
10K3A1 thermistor (A = 1.12924x10 -3 , B = 2.34108x10 -4 , C = 0.87755x10 -7 ). You
can change the coefficients under the Sensor Coeffs menu.