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What is the main component of an integrating type DVM?

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What is the main component of an integrating type DVM?

(a) diode

(b) amplifier

(c) op amp

(d) oscillator

The question was posed to me in a job interview.

My question is from Voltage to Frequency Converter Type Integrating DVM topic in section Electronic Instruments of Electrical Measurements

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Correct answer is (c) op amp

To elaborate: An op amp forms the heart of the integrating type DVM. Op amp is used as an integrator. The input signal is integrated for a fixed interval giving rise to a ramp signal at the output.

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