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Introduction • On Precision Pots • General Product Definitions • Construction Details • Multiturn Precision Pots • Resistive Elements • Terminals • Shaft-Rotor Assembly • Mechanical Rotation • Mounting Methods • 3540 Family • 3590 Family • Knobpot 3600 Family • Single-Turn Precision Pots • 6537/6637 Family • 6539/6639 Family • 3680 Pushbutton Family • Special Precision Pots • Shafts • Mounting Styles • Bearings • Torque • Linearity • Wiper Load • Low Current Applications • High Rotational Speed • Angles • Additional Taps • Sealed Units • Multicup Assemblies • Envelopes •
Environmental • Competition •
Useful Terms
Linearity
Linearity can be established to meet a wide range of application design requirements such as "Absolute," "Terminal-based," or even a customer-defined linearity. "Independent" linearity is the industry standard and is used by Bourns. Unless otherwise specified, Bourns assumes that requests for changes in linearity tolerances will be independent linearity.
For absolute linearity, a tolerance must not be established on the effective electrical angle, since linearity tolerance governs the length of the angle.
Linearity of tighter tolerance is available in both conductive plastic and wirewound models. For conductive plastic elements, modern trimming techniques allow for easier manufacture to tight tolerances, even in small quantities. As a rule of thumb, the best available linearity of wirewound elements is twice the resolution.
Wirewound models are best suited to tight linearity tolerances in high volume production, which allows for selective yields to be used. Wirewound elements can be manufactured to tighter tolerance in short runs with higher cost assembly methods, or by using extra taps and external padding resistors.
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