Resistance Temperature Transducer A resistive transducer uses a sensing element whose resistance varies with temperature. For a particular transducer, the resistance varies as RTR¼0.375T þ 100 V, where Tis temperature in C. This transducer is to be included in a circuit to measure temperatures in the range from 200 C to 800 C. The circuit must convert the transducer resistance variation over this temperature range into an output voltage in the range from 0 to 5 V. Two proposed circuit designs are shown in Figure P4–91. Which of these circuits would you recommend for production and why? Hint: First verify that the circuits perform the required function. Use OrCAD to verify your results.

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100 VTR 5V + RTR 2.5 V + w 900 Circuit 1 RTR VTR 600 + 5V 100 2: 2.5 V + Circuit 2 FIGURE P4-91 www 600 www 1 + Vo Vo