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    Output voltage, maximum error and potentiometer characteristics

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    a) Calculate the value of Output voltage at 50%
    b) Draw a graph of the 'tapper' position, Vo.
    c) Indicate on the graph the ideal characteristics of such a system.
    d) Calculate the maximum error as a percentage of the true value.
    e) Suggest how the system could be improved to give a characteristic closer to the idea

    The information is in the attached PDF file.

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    Solution Preview

    Assume Taper position = x (in %)

    Hence, resistance in parallel with recorder (RL = 0.5 kOhm)
    R1 = 3*x/100 = 0.03x kOhm
    Remaining resistance,
    R2 = 3 - R1 = 3 - 0.03x

    Parallel R1 and RL:

    R|| = 0.5*0.03x/(0.5+0.03x) = 0.015x/(0.5+0.03x)

    Net resistance of the ...

    Solution Summary

    The solution describes variation of output voltage across load with change in potentiometer resistance taken into account.