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How do I take results from an exponential saturation curve?

  1. Nov 27, 2015 #1
    1. The problem statement, all variables and given/known data

    I have been working on a lab report recently in which I took some data and then further used this data to gather results.

    I was plotting magnetic flux density as a function of current, this turned out to be an exponential saturation curve. I plotted this curve using a package at university.

    My question is, do I use my original data points to calculate my results, or do I use the data that the non-linear fit gives me?

    2. Relevant equations

    Y=b1*(1-exp(-b2*x)) -> My equation for the linear fit

    3. The attempt at a solution

    I have tried both, the results from the equation seem to give results closer to tabulated values; however I am wondering is this the correct way to go about the experiment.
    Last edited by a moderator: Nov 27, 2015
  2. jcsd
  3. Nov 28, 2015 #2


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    Staff: Mentor

    Calculate which results? In general, if the curve is a good fit, using its values is probably more accurate as some measurement uncertainties can average out. In addition, you are not limited to data points - you can use intermediate values as well. If the curve doesn't fit well, do not use it.
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