configuration
wire potentiometer is wound on a bobbin and coil resistance wire moves along the potentiometer wiper and a brush on its composition, skeletal section should be the same everywhere, uniform cross-section and made of a material like resistance wire wound from a pitch.
disadvantages
wire potentiometer having a high accuracy, good stability, low temperature coefficient, the contact reliable, and high-temperature, high power load capacity.
disadvantage wire potentiometer resistance range is not wide enough, the difference between high-frequency performance, resolution is not high, and high resistance wire potentiometer Flaky, larger volume, than the price high. .
Considerations
1 resistor wire potentiometer mostly made of synthetic resin multi-carbonated should avoid contacting with the following items: ammonia, other amines, alkali aqueous solution, aromatic hydrocarbons, ketones, hydrocarbon lipids, strong chemicals (high pH), etc., otherwise it will affect its performance. .
2 terminal wire potentiometer should avoid the use of soldering flux capacitive water, or a metal oxide material would encourage mold; avoid the use of inferior solder, poor solder may cause difficulties on tin, lead open circuit or poor contact.
3. Terminal wire potentiometer during welding when the welding temperature is too high or too long may cause damage to the potentiometer. Pin type terminal when welded at 235 ℃ ± 5 ℃, within 3 seconds to complete, from the potentiometer to be welded body 1.5MM above, do not flow through the circuit board by soldering during soldering; Solder terminals when welded at 350 ℃ ± 10 ℃, within 3 seconds to complete. And the terminal to avoid stress, otherwise easily lead to poor contact.
4. Welding, rosin (flux) into the appropriate height adjustment of the press plate, to avoid intrusion of flux inner wire potentiometer, or will result in poor contact brush and the resistor, generating INT , noise negative phenomena.
5. Wirewound potential is preferably applied to the voltage adjustment structure, and the wiring should choose "1" pin is grounded; should be avoided current adjustment structure, since the contact resistance between the contact piece against resistance by the large current.
6. Wirewound potential surface to avoid the presence of condensation or water drops, in a wet places, in order to prevent deterioration of the insulation or cause a short circuit.
7. Installation "rotary type" potentiometer fixed nut intensity should not be too tight to avoid damage and poor or rotating thread; Install "steel sliding straight" when the wire potentiometer, avoiding the use of long screws, or they may impede movement of the sliding handle, or even directly damage the potentiometer itself.
8. Online process put around the potentiometer knob, the thrust can not use too large (parameter index can not exceed the "specifications" of the central axis of the push-pull), otherwise it will cause damage to the potentiometer.
9. Wirewound potential turning operating force (rotating or sliding) to increase as the temperature becomes lighter tightened with decreasing temperature. If the potentiometers should be noted that the use in low temperature environments, to use a special low temperature grease.
10. Wire potentiometer shaft or shank slip design should try to use as short as possible. Axis or the shorter the length of the slide lever handle and stable as possible. Conversely the longer the greater the shaking, feel easy to change.
11. Carbon wire potentiometer power can withstand the ambient temperature is 70 ℃, when a temperature is higher than 70 ℃ may lose its power.