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What are generally designed to have a very high value of input impedance to take care of high electrode impedance?(a) Montages(b) Electrodes(c) Preamplifiers(d) FiltersThe question was posed to me by my college director while I was bunking the class.My question is from Measurement of Heart Rate topic in section Patient Monitoring System of Biomedical Instrumentation

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The correct choice is (C) Preamplifiers

Easy EXPLANATION: Good ELECTRODE impedance should be generally below 5 kilohms. Impedance between a pair of electrodes must also be BALANCED or the difference between them should be less than 2 kilohms. EEG preamplifiers are generally DESIGNED to have a very high value of input impedance to take care of high electrode impedance.



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