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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
Hybrid Elements
It is possible to combine a wirewound element with a conductive plastic coating to produce a hybrid element. This element exhibits the temperature coefficient and resistance stability of the wirewound element and the long operational life, low resolution, and low noise of the conductive plastic element.
Hybrid elements are expensive to produce. Their major application is in high-precision servo systems, where their advantages in overall stability justify their substantially higher cost.
Figure 2.41 compares the resistive element types by their typical characteristics.
Figure 2.41
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This chart summarizes the major attributes of the resistive elements.
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