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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
Output Smoothness
Output Smoothness (OS) applies to potentiometers with non-wirewound elements used for precision applications. It varies from CRV and ENR in that it is measured while the wiper is in motion and an output load current is present. This means that OS is measured in an actual application mode.
OS is defined as the maximum instantaneous variation in output voltage from the ideal output voltage. OS is always expressed as a percentage of the total input voltage.
A typical specification is 0.1% maximum.
The factors contributing to CRV also cause output voltage variations. Because these parameters are current sensitive, the presence of an output load current is a significant contributor to OS.
The circuit shown in Figure 2.51 is the industry standard test circuit.
Figure 2.51
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