2. what is meant by loading error in a signal measurement? also, suppose that a piezoelectric sensor of output impedance zs is connected to a voltage-follower amplifier of input impedance zi, as shown below. the sensor signal is vi volts and the amplifier output is vo volts. the amplifier output is connected to a device with very high input impedance. plot (use any software that you feel comfortable with) the signal ratio vo/vi against the impedance ratio zi/zs for values of the impedance ratio in the range 0.1 to 10. what is your finding?