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Homework Help: Uncertainties question

  1. Oct 8, 2015 #1
    1. The problem statement, all variables and given/known data
    A nominally linear electrical output force measuring device has the following manufacturer

    Input range : 0-100 lbf
    Full Scale output : 30mV

    Temperature effect on:
    Zero 0.002 % full scale/degrees Fahrenheit
    Span 0.002 % of reading/degrees Fahrenheit

    The device is used in an environment where the ambient temperature is not controlled
    and can vary between 50 and 95°F.

    For an input of 6mV, what are the uncertainties from these effects?

    2. Relevant equations

    3. The attempt at a solution
    I am supposed to be getting +0.015/-0.012 as the answer but I don't know what I should do to get this. I have tried 0.002 % of 100, 30 , 60 but nothing is working
  2. jcsd
  3. Oct 8, 2015 #2


    Staff: Mentor

    Can you elaborate a bit on what these mean?
    I'm confused. Above you say that the input range is 0 - 100 lbf (pound feet?), and the max output is 30mV. Just above you say that the input is 6mV. Do you have the inputs and outputs switched?
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