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What is necessary for providing a common reference for measurement?

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What is necessary for providing a common reference for measurement?

(a) active electrode

(b) ground electrode

(c) tape recorder

(d) oscilloscope

I got this question during an online interview.

The query is from Measurement of Respiration Rate in division Patient Monitoring System of Biomedical Instrumentation

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Best answer
The correct choice is (b) ground electrode

Best explanation: A ground electrode is necessary for providing a common reference for measurement. These electrodes pick up the potentials produced by the contracting muscle fibres. The signal can then be amplified and displayed on the screen of a cathode ray tube. It is also applied to an audio amplifier connected to a loudspeaker.

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