The circuit shown in Fig. 1 can be used in a digital multimeter for measuring re
ID: 1831821 • Letter: T
Question
The circuit shown in Fig. 1 can be used in a digital multimeter for measuring resistance. The resistance, say Rx, is hooked across the meter probes, making it the feedback resistor in the op-amp conguration. The output voltage Vo is used as an indication of the value of Rx. Explain how this works by finding Vo as a function of Vref , Rref (both known), and Rx. The circuit shown in Fig. 1 can be used in a digital multimeter for measuring resistance. The resistance, say Rx, is hooked across the meter probes, making it the feedback resistor in the op-amp conguration. The output voltage Vo is used as an indication of the value of Rx. Explain how this works by finding Vo as a function of Vref , Rref (both known), and Rx.Explanation / Answer
Vo=(-Rx/Rref)*Vref
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