A system is needed to measure flow, which continuously cycles between 20 and 30 gal/min with a period of 30 sec. The required output is a voltage varying from -2.5 to +2.5 V for the cycling flow range. The sensor to be used has a transfer function of v Q volts, where Q is in gal/min, and an output impedance of 2.0 kO. Tests show that the output of the sensor has 60 Hz noise of 0.8 V rms. Design a signal-conditioning system, including noise filtering, and evaluate your design as follows.
a. Plot output voltage versus flow, and comment on the linearity.
b. Determine the noise on the output as percent FS.