What are the types, characteristics and uses of potentiometers and variable resistors? Variable resistance referred to as VR, also known as potentiometer is commonly used in electronic products or electronic instruments panel adjustment knob or electronic products internal line adjustable resistance (fine adjustment resistance).
Potentiometers are commonly used in mechanical equipment or automatic control equipment as sensors to feedback displacement such as linear displacement or angular displacement and so on.
Variable resistance and conductive plastic potentiometers are basically based on the resistance body and the fold (brush) constitute its main structure, its types can be broadly distinguished as: carbon film, glass glaze, winding, conductive plastic four kinds. Its characteristics are as follows:
Carbon film: commonly used variable resistance is this kind of feature is made into low. Suitable for mass production and its resistance sheet can be printed into linear curve logarithmic curve exponential curve but because of its large temperature coefficient easy to produce output resistance value temperature wave, it is more suitable for the panel of electronic products used to adjust the function of the product.
Glass glaze: also known as metal film, its use is characterized by its resistance sheet is made of ceramic substrate, so its temperature coefficient is low output resistance value fixed is not easy to produce resistance value temperature drift is generally used in electronic circuit to play the role of adjustable resistance (semi-fixed resistance) but because of the characteristics of the glass glaze (metal film), so its smoothness is poor Less suitable for panel adjustment and because it is a ceramic substrate easy to break so generally manufactured products are not used in the vibration field.
Winding: also known as winding. Due to the winding resistance, it is generally used in the case of products requiring large power, such as some ovens or the adjustment panel of equipment requiring large power. And its output temperature float low resistance value stability is more suitable for industrial equipment on the control panel use. But because it is wound, its resolution cannot present continuous linear output. Therefore, it is not suitable for some occasions where continuous output is required, such as sensors.
Conductive plastics: commonly used in precision equipment or precision machine displacement sensors with back and forth signal, its advantages are infinitesimal resolution, high linear accuracy, long life and other characteristics, but because of its use of precious metal actuator (brush) so its high price, so it can not replace a large number of carbon film variable resistance.