Explanation: In all the applications mentioned above, the input voltage Vin is converted into an output current of Vin/R1 or the input voltage appear across resistor. 4. The op-amp in low voltage DC voltmeter cannot be nullified due to
A. D’Arsonaval meter movement
B. Offset voltage compensating network
C. Selection of switch
D. Gain of amplifier
Answer:A
Explanation: In all the applications mentioned above, the input voltage Vin is converted into an output current of Vin/R1 or the input voltage appear across resistor. 4. The op-amp in low voltage DC voltmeter cannot be nullified due to
A. D’Arsonaval meter movement B. Offset voltage compensating network C. Selection of switch D. Gain of amplifier
Explanation: The op-amp sometimes cannot be nullified because the output is very sensitive to even slight variation in wiper position of D’Arsonaval meter movement (ammeter with a full scale deflection of 1mA). 5. What is the maximum input voltage that has to be selected to calibrate a dc voltmeter with a full scale voltage range of 1-13v.