____________ is necessary for providing a common reference for measurement?(a) active electrode(b) ground electrode(c) tape recorder(d) oscilloscopeThe question was posed to me in an interview for job.This key question is from Multi-Channel Wireless Telemetry System topic in chapter Biomedical Telemetry of Biomedical Instrumentation

____________ is necessary for providing a common reference for measure

1.	____________ is necessary for providing a common reference for measurement?(a) active electrode(b) ground electrode(c) tape recorder(d) oscilloscopeThe question was posed to me in an interview for job.This key question is from Multi-Channel Wireless Telemetry System topic in chapter Biomedical Telemetry of Biomedical Instrumentation
Answer» Correct choice is (b) ground ELECTRODE To explain: A ground electrode is necessary for providing a common reference for measurement. 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.These ELECTRODES pick up the POTENTIALS produced by the contracting muscle FIBRES.

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