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In which of the following ways can the disadvantages of chopper amplifier type pH meter be overcome?

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In which of the following ways can the disadvantages of chopper amplifier type pH meter be overcome?

(a) Using zero corrected DC amplifier

(b) Using modern design

(c) Using digital design

(d) Using vibrating condenser

I got this question in final exam.

This intriguing question originated from pH Meters topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

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Correct option is (d) Using vibrating condenser

Best explanation: The disadvantages of chopper amplifier type pH meter can be overcome using a vibrating condenser. It is used in the place of the mechanical chopper.

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