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A calibrating signal of _____ mV amplitude can be connected to preamplifier with an input selector switch.

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A calibrating signal of _____ mV amplitude can be connected to preamplifier with an input selector switch.

(a) 10

(b) 20

(c) 30

(d) 40

This question was addressed to me by my college director while I was bunking the class.

I'd like to ask this question from Cyber Medicine topic in section Telemedicine Technology of Biomedical Instrumentation

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Correct option is (c) 30

The explanation: The preamplifier used by Goodman (1969(a)) has a CMRR of 106 dB (200,000 : 1) with a common mode input impedance of 150 MW. The preamplifier gain is of the order of 1000. The preamplifier also must incorporate the facility for ‘probe balance’ by which signals in phase with the magnet current can be selected to balance background voltages in phase with flow voltages. A calibrating signal of 30 mV amplitude can be connected to the preamplifier with an input selector switch.

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