A displacement sensor has a sensitivity of S mV/mm and is used to measure displacements of up to 1m. The output resistance of the sensor is 200Ω. The sensor is connected to an amplifier that converts the displacement sensor signal to a form suitable for driving a voltmeter at its output. The voltmeter has an input resistance of 1kΩ. The voltmeter
A displacement sensor has a sensitivity of S mV/mm and is used to measure
displacements of up to 1m. The output resistance of the sensor is 200Ω. The sensor
is connected to an amplifier that converts the displacement sensor signal to a form
suitable for driving a voltmeter at its output. The voltmeter has an input resistance of
1kΩ. The voltmeter requires an input voltage of 6V for the full-scale deflection. The
meter scale is marked linearly such that full-scale deflection corresponds to 1m. The
amplifier subsystem has an input resistance of 2kΩ and an output resistance of
100Ω. The open circuit voltage gain Av may be adjusted over a wide range of values,
as required.
Derive the formula for and then calculate the relative change of the amplifier gain
due to the loading effects.
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