A pressure-measurement system uses a sensor that converts pressure into voltage according to the transfer functions. This voltage is then converted into a current. As the pressure varies from 0 to 100 psi, the current varies from 4 to 20 mA.
a. Find the transfer function equation for the conversion of voltage to current.
b. What pressure change will cause the current to change by 1 mA from 19 mA to 20 mA?
c. What pressure change will cause the current to change by 1 mA from 4 mA to 5 mA? Why is the pressure change not the same as in the previous case, even though the current changed by 1 mA in both cases?
d. Prepare a graph of current versus pressure. Is it linear or nonlinear?