CMRR of preamplifier upto 5 Khz should be _____________(a) 10 dB(b) greater than 90 dB(c) less than 90 dB(d) 30 dBThe question was asked during an online exam.I would like to ask this question from Multi-Channel Wireless Telemetry System in division Biomedical Telemetry of Biomedical Instrumentation

CMRR of preamplifier upto 5 Khz should be _____________(a) 10 dB(b) gr

1.	CMRR of preamplifier upto 5 Khz should be _____________(a) 10 dB(b) greater than 90 dB(c) less than 90 dB(d) 30 dBThe question was asked during an online exam.I would like to ask this question from Multi-Channel Wireless Telemetry System in division Biomedical Telemetry of Biomedical Instrumentation
Answer» The CORRECT option is (b) greater than 90 dB The explanation: The common-mode rejection should be greater than 90 dB up to 5 kHz.The main amplifier has controls for gain adjustment from 5 mV/div to 10 mV/div for SELECTING the SENSITIVITY most appropriate to the incoming signal from the PATIENT. A calibrating square wave signal of 100 mV (peak-to-peak) at a frequency of 100 Hz is usually available.

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