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
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Solution Summary
The solution describes variation of output voltage across load with change in potentiometer resistance taken into account.
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a.
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 ...
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- BEng, Allahabad University, India
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