5300 Series TECSource User’s Manual · Page 23
temperature range. The typical setting is 100μA, 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
RCRBA
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.
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