Answer Happy

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(b) A temperature measurement circuit utilizing Resistance Temperature Detectors (RTD) is shown in Figure Q3 (b). The parameters of the RTD are given as follow. R(T) = 450 22 at 20 °C, ao = 0.005 /°C and Pp = 30 mW/°C at 20 °C. Both resistors R, and Rz are identical fixed resistors with a value of 500 12, while R3 is a variable resistor. If the RTD is placed in a bath with a temperature of 20 °C, determine the resistance that needs to be set for R3 to null the bridge. The effect of self-heating must be considered in the calculations. R1 R2 10V + Vo R3 SRID Figure Q3 (b)