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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
Special Precision Potentiometers
This section is intended to help you define special configurations of Bourns precision potentiometers. However, before you begin to investigate a custom option, we suggest that you make certain that all the standard models have been considered. With the broad selection of precision potentiometers, it is quite possible that your customer can find an "off the shelf" solution for the intended application. Standard products save time and are more cost effective than a customized product.
After making an assessment of the customer's application and the determination that a standard product is not suitable, a base model should be selected that best fits the application. Most models can be modified given sufficient time and budget. However, some models have a more flexible design and are therefore easier to customize. Your local Bourns Field Application Engineer can provide assistance in customizing a model.
Standard products are designed to provide the most cost effective specification and tolerance level. Some customers may request tighter tolerances without realizing that the customization could have a negative effect on other performance factors.
Some of the most typical modifications and options are:
| Shaft |
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Special length, diameter, material, slot dimension, flat dimension, radial and axial hole, thread type, gear, dual concentric shaft, front and rear configuration |
| Lid |
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Special bushing, servo lid dimension, material, locking bushing, screw-hole mount, anti-rotation feature, location hole |
| Environmental |
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Special shaft and/or panel seal, dip test seal, oil-filled construction, and protection against harsh environment such as salt spray/fog and extreme temperatures |
| Mechanical |
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High or low torque, slipping clutch, tight mechanical run-out, clamp band position, special marking |
| Electrical |
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Choice of element (wirewound, conductive plastic, cermet, and Hybritron®), resistance value and tolerance, linearity (independent, zero-based, etc.) closed-loop element, special electrical angle, multi-cup assembly, phasing of multi-cup assembly, shaft-output relationship, special lubricant, custom test method |
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