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Preamplifiers used in electroencephalograph have low gain and high noise characteristics for EEG.(a) True(b) FalseThis question was addressed to me during an interview for a job.The above asked question is from Multi-Patient Telemetry topic in portion Biomedical Telemetry of Biomedical Instrumentation

Answer» CORRECT answer is (b) False

To EXPLAIN I would say: It is False. Preamplifier used in electroencephalographs must have high gain and low noise characteristics because the EEG potentials are small in amplitude. In addition, the AMPLIFIER must have a very high common-mode rejection to minimize stray interference signals from power lines and other ELECTRICAL equipments.


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