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The op-amp in low voltage DC voltmeter cannot be nullified due to

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in Linear Integrated Circuits by (40.4k points)
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

The question was asked in an international level competition.

I want to ask this question from Voltage to Current Converter with Floating and Grounded Load in chapter Operational Amplifier Applications of Linear Integrated Circuits

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by (13.9k points)
Answer: (b) Offset voltage compensating network

In a low voltage DC voltmeter using op-amp with floating load configuration, the op-amp cannot be nullified due to the presence of offset voltage compensating network. This network makes it difficult to achieve perfect nullification in low voltage measurement applications.

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