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What is necessary for providing a common reference for measurement?(a) active electrode(b) ground electrode(c) tape recorder(d) oscilloscopeI got this question during an online interview.The query is from Measurement of Respiration Rate in division Patient Monitoring System of Biomedical Instrumentation

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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