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Introduction - Basic Potentiometer Theory • Resistors • Building Potentiometers • Modern Variable Resistive Devices • Applications Modes • The Parts of a Potentiometer • Resistive Elements • Cermet • Conductive Plastic • Hybrid Elements • Terminations • Contacts • Electrical Parameters • Total Resistance • Minimum Resistance • End Resistance • Contact Resistance • Contact Resistance Variation • Equivalent Noise Resistance • Output Smoothness • Adjustability • Temperature Coefficient • Resolution • Conformity • Linearity • Power Rating • Summary of Electrical Parameters • Useful Terms
Total Resistance
Total resistance (TR) is the resistance between the end terminals of a potentiometer. The end terminals are shown as 1 and 3 in Figure 2.44.
Figure 2.45
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Total resistance is always specified as a nominal value in Ωs. A plus and minus percent tolerance from the nominal value is also specified.
The resistance is always specified when defining any potentiometer. It is also known as value of the potentiometer, maximum resistance, or simply the resistance.
The major contributor to total resistance is the potentiometer's resistive element. The materials and methods used to construct the element determine its resistance.
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