Basic knowledge of carbon film potentiometer sensor

　　As a variable resistor or voltage divider, carbon film potentiometer sensors are used for a wide range of purposes, fine-tuning bias and gain, setting LCD contrast, adjusting supply voltage, and more. In the current competitive market, electronic carbon film potentiometer sensors are used in many cases to replace the past type carbon film potentiometer sensors. The advantage of electronic carbon film potentiometer sensor is very prominent. First of all, in use, the carbon film potentiometer sensor needs to be adjusted with tools, which is very inconvenient, and the basic knowledge of the electronic carbon film potentiometer sensor is digital, and the basic knowledge can be controlled by signal, and then implemented by programming. In addition, electronic carbon film potentiometer sensors are easy to mass produce, low cost, reliable and durable. Of course, in the specific use, we also need to make further comparative analysis of the two devices.

　　· Resolution: In theory, the carbon film potentiometer sensor has an infinite resolution, the actual resolution of the basic knowledge depends on the structure of the device and the user's skills, skills vary from person to person, with time changes, high-precision to use a multi-ring carbon film potentiometer sensor. Electronic carbon film potentiometer sensors cannot provide unlimited resolution, but the appropriate resolution can be selected for a specific application, and the resolution is normalized, repeatable, and guaranteed.

　　· Reliability: the carbon film potentiometer sensor has a contact, the contact is resistive, and the value is uncertain; In addition, although the basic knowledge of carbon film potentiometer sensors has good sealing, the impact of the environment is still relatively large, and the impact of vibration and shock is greater. The reliability of electronic carbon film potentiometer sensors is as undoubted as that of integrated circuits, but it is also necessary to recognize when using it that it is volatile or non-volatile. Once the volatile device loses power, the internal register setting information no longer exists, so there should be an EEPROM, flash memory, or other non-volatile memory outside.

　　· Power supply voltage: The carbon film potentiometer sensor needs a power supply voltage to work, and its operating voltage cannot exceed the rail-to-rail value of the device. Generally speaking, the usual digital circuit design is in the range of 2.7V to 5V, and the analog circuit has several specifications of ±5V, ±12V, and ±15V, so it is necessary to take into account the power supply matching problem.

　　Push-pull potentiometer sensor knowledge overview

　　1. Full rotation Angle: refers to the Angle of rotation VR from the end of one end to the end of the other end of the test

　　2. Full sliding travel: The knowledge refers to the travel distance of straight sliding VR from the end of one end to the end of the other end

　　3. Rotation (sliding) torque: refers to the force used by VR to rotate (or slide) from one end to the other end. 4. Terminal tightness: refers to the degree of tightness between the terminal and the resistance piece after riveting, and the force between the test end and the edge of the resistance piece is within the standard range

　　If there is no professional equipment, you can only push and pull the potentiometer sensor, knowledge to detect several items: total resistance, rotational torque, continuity, zero resistance, end resistance and axial clearance, radial clearance.

　　Where: total resistance, continuity, zero resistance and end resistance can be tested with a three-meter or multimeter. Continuity means that when the moving contact of the product moves continuously in one direction on the resistance body, the resistance value should change continuously in one direction with the moving contact. The end resistance is only effective for a potentiometer sensor with a stop.

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