What is the principle and definition of dual potentiometer sensor

　　The resolution is determined by the theoretical accuracy of the dual potentiometer. For wire-wound dual potentiometers and linear dual potentiometers, the resolution is expressed as a percentage of the resistance change caused by each turn of the moving contact on the winding and the total resistance. For dual potentiometers with functional characteristics, the resolution is a variable because the resistance of each turn on the winding is different. At this time, the resolution of the dual potentiometer generally refers to the average resolution of the maximum slope section of the function characteristic curve.

　　Sliding noise is a special noise of dual potentiometer. When changing the resistance value, the principle defines that when the moving contact moves on the surface of the resistor due to improper resistance distribution of the dual potentiometer, improper coordination of the rotating system and the contact resistance of the dual potentiometer, the output end in addition to the commercial equipment market, representative safety standards are UL, CSA, VDE, etc., the content varies according to the use. The allowable leakage current is between 0.5mA and 5mA, and the leakage current stipulated by the Chinese military standard GJB1412 is less than 5mA. The leakage current of the power device to the ground depends on the capacity of the EMI filter capacitor Cy, as shown in Figure 2. From the perspective of the principle of EMI filter, it is defined that the larger the capacity of power generation capacity Cy, the better, but from the perspective of safety, the smaller the capacity of capacitor Cy, the better, and the capacity of capacitor Cy is determined according to safety standards. If the safety performance of capacitor Cx is poor, the power grid transient peak may be broken down, although its breakdown does not endanger personal safety, but will make the filter lose the filtering function. In order to prevent false electric shock, in principle, the product end (non-power end) of the plug holder is a pin, and the power grid end (power end) is a hole; The input end of the power supply device is a needle, and the output end is a hole.

　　In addition to the useful signal, there is also noise that fluctuates with the signal.

　　For the wire-wound potentiometer principle, by definition, in addition to the above-mentioned contact noise between the moving contact and the purpose of the winding, there are also resolution noise and short-circuit noise. Resolution noise is caused by the stepwise nature of resistance changes, while short-circuit noise is generated when the moving contacts move on the winding and short-circuit the adjacent turns

　　In the design, sealing measures should be taken for the components that are required to seal; The combination device that cannot be repaired can be potted with epoxy resin; The moisture absorption of the components and raw materials used should be small, and mildew products such as cotton, hemp and silk should not be used; The principle of sealed chassis and cabinet should be defined and set up protective nets to prevent insects and rodents from entering; The outer top of the device directly exposed to the atmosphere should not be concave structure to avoid corrosion caused by water; Corrosion-resistant materials can be selected, and then the surface of the electronic equipment and its components can be covered with a layer of metal or non-metal protective film to isolate the surrounding media by plating, coating or chemical treatment; The structure adopts a sealed or semi-sealed form to isolate the external adverse environment; The printed board and component surface coated with special anti-corrosion varnish can effectively avoid corona and breakdown between wires, and improve the reliability of power supply.

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