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Homework Help: Transfer Function Equation

  1. Mar 20, 2008 #1
    1. The problem statement, all variables and given/known data

    A pressure measurement system uses a sensor that converts pressure into voltage according to the transfer function, Vp = (.5)(square root of P). This voltage is then converted into a current. As pressure varies from 0 - 100 psi, the current varies from 4 - 20 mA.

    A. Find the transfer function equation for the conversion of voltage to current.

    Known variables
    P = 0 - 100 psi
    I = 4 - 20 mA

    2. The attempt at a solution

    I would attempt a solution if I knew where to start. The best I can do so far is use the given transfer function of Vp = (.5)(square root of P) to convert pressure into voltage. After that I'm at a loss as to where to get the equation for the conversion of voltage to current. Is there anyone out there that can point me in the right direction?
    Last edited: Mar 20, 2008
  2. jcsd
  3. Mar 21, 2008 #2
    Yeah that's pretty vague; There is an infinite amount of different functions you can fit to the 2 endpoints given. You can use linear interpolation for the easiest transfer function based on your thinking of grabbing the corresponding voltages to the pressures/currents.
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