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Characteristics and disadvantages of various potentiometers
The characteristics of wire-wound potentiometers are: high temperature resistance, large rated power, small resistance temperature coefficient, good resistance value stability, small change in contact resistance, small current noise and reliable contact, and can achieve various output function characteristics. And it is easy to control and guarantee the linear and nonlinear high output characteristic accuracy. At the same time, since the wire-wound potentiometer has made new developments in materials, structure, process and technology, it has further improved reliability and extended Service life.
The disadvantages of wire-wound potentiometers are: because the output is a stepped broken line, there is a step error, low resolution, poor wear resistance, especially easy to disconnect at high resistance, short life, large dynamic noise, and narrow resistance value range "10 Ohm-30 Ohm》 Poor high-frequency performance and price comparison.
The characteristics of metal film potentiometer are: small temperature coefficient of resistance, high resolution, high temperature resistance, small friction torque, and good high frequency characteristics. The disadvantages are: low rated power consumption, poor wear resistance, narrow resistance value range "50 ohm-20K" is expensive.
The characteristics of the synthetic carbon film potentiometer are: high resolution, can be connected to Wu step-by-step voltage regulation, good abrasion resistance, long life, easy to make linear and non-linear potentiometer, strict control of the thickness and width of the resistor body, can Get high output characteristic accuracy, linearity is generally about 1%, after repairing can be improved to about 0.1%, resistance range, generally 100 ohm-5M. This kind of potentiometer has low price and simple manufacturing process. Wide range of uses.
The disadvantages of the synthetic carbon film potentiometer are: because the synthetic carbon film resistor contains an organic junction phase in the body, the temperature resistance is poor, and it is prone to aging under high temperature, so the operating temperature should not be too high and the rated power consumption is not large; The ratio of the bonding phase and the conductive phase, the thickness of the particles, and the uniformity of the slurry in the synthetic carbon film resistor have an effect on noise. Therefore, the contact resistance is large, the dynamic noise is large, the resistance temperature is large, and the operating temperature is low.
Conductive plastic potentiometer features:
A; The resistor can be made into solid or film type with arc or straight shape, the surface is as smooth as a mirror, the smoothness is good, and the resolution is quite good.
B; There is almost no friction between the contact brush and the resistor, the rotation torque is small and constant, there is almost no wear problem, the life is long, the rotation noise is small, and the reliability is high.
C; Wide resistance range, temperature coefficient of resistance is 110 °.
D; Linear accuracy is usually practical with independent linearity, and the accuracy is above 0.1-0.5%.
E; Rated power consumption is 2-3W F; Chemical resistance, antigenon radiation.
G; Simple production process, less environmental pollution,The disadvantages of conductive plastic potentiometers are: poor temperature resistance, large contact resistance, high release pressure required, not easy to make very high, the use temperature range is -55 ° -70 °. The characteristics of photoelectric potentiometer are: no mechanical contact brush for conventional potentiometer, no mechanical friction. No wear, long wear life, up to several hundred million weeks, high resolution, low noise, high sensitivity, and continuous output signal. High reliability, resistance range, 500 ohm-15M. Wide range of working angles.
The shortcomings of the photoelectric potentiometer are: the contact resistance is large, and because the photoconductive material is not a pure conductor, the contact resistance at the photoelectric contact is quite high, which can reach 10K ohms. It is difficult to output large currents because of the hysteresis characteristics, poor high-speed response, high output impedance, narrow operating temperature range, large resistance temperature coefficient, and high linearity. It can only reach 1 after trimming. %about.