Sealed potentiometer sensor contact resistance

　　Contact is the resistance between the end of the brush and the direct contact point of the brush on the resistance track of the potentiometer. Contact resistance is an important index which affects the performance of potentiometer. The contact resistance consists of three parts:

　　The first part is the overall voltage drop between the current-carrying resistance track and the contact surface. This part depends to a large extent on processing technology factors, about a few hundred ohms.

　　The second part, the external components, is far more difficult to control than the first. This external transition resistance is very similar to the contact resistance that occurs between the switch and the plug and socket connector. From an electrical point of view this is due to the excessive partial contact between the brush and the potentiometer resistance track is not ideal. Metal oxides, chlorides and sulfides, mixed with various organic substances, will result in a thin insulating layer on the surface of the resistance track. If not guaranteed within a certain range, these additional resistors under unfavorable conditions will result in completely outside the set tolerance range. It is absolutely necessary to ensure that the potentiometer receives strict quality control during the manufacturing process and guarantees match.

　　The third part, the dynamic part, is related to the high-speed movement of the brush under the driving force. With the help of the damping brush, it is possible to achieve any appreciable increase in resistance at transmission speeds up to 10 m/s.

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