Apogee Instruments TS-210 Manuel du propriétaire - Page 14

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Conversion of Thermistor Resistance to Temperature
The thermistor is a resistive element where resistance changes with temperature. Thermistor resistance (R
is measured with a half-bridge measurement, requiring a known excitation voltage input (V
of output voltage (V
):
OUT
where 24900 is the resistance of the bridge resistor in Ω. From resistance, temperature (T
with the Steinhart-Hart equation and thermistor specific coefficients:
where A = 1.129241 x 10
measured temperature in Kelvin can be converted to Celsius (T
(1)
(2)
-3
-4
, B = 2.341077 x 10
, and C = 8.775468 x 10
.
(3)
-8
(Steinhart-Hart coefficients). If desired,
):
C
, in Ω)
T
) and a measurement
EX
, in Kelvin) is calculated
K