Potentiometers are variable resistance devices. A change in the linear or angular displacement of a potentiometer varies the effective length of its conductor, and therefore the resistance of the device. This change in resistance can be related to the displacement through a change in output voltage. Potentiometers have a tendency for nonlinearity, and care must be taken when a high degree of accuracy is required. Trimmer potentiometers are often built into the circuit to adjust the maximum and minimum output voltage to correspond to the maximum and minimum displacements of the measurement potentiometer. (Figure 5)
Figure 5 Angular motion potentiometer and circuit with trimmers for upper and lower limits
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Support for the development of this module was provided by the National Science Foundation and The Cooper Union for the Advancement of Science and Art.
Please send questions or comments to Professor Ron Adrezin or Professor Daniel Raichel.