angle Displacement sensor The principle of left and right balance detection is explained
angle Displacement sensor In addition to the usual three terminal output, the angle potentiometer also has a type of four terminal output, which is the so-called tap potentiometer. This kind of tap potentiometer has one end more than usual, i.e. four terminals (refer to the following tap potentiometer picture), The fourth terminal is in the potentiometer total resistance value of 50% of the place to pull out a terminal to apply (so called tap potentiometer)
Picture of tap potentiometer:
When the tap displacement sensor rotates, when the change end of the second end reaches the middle point with the rotation of the shaft handle, the resistance output of the two ends and four ends is 0 Ω. When the tap displacement sensor rotates to the left and right, the resistance value of the two ends and four ends will increase again. Therefore, the resistance output of the tap potentiometer at the central point (i.e. the place with 50% resistance) is the minimum, and it will increase when it rotates to both sides (refer to the following schematic diagram)
Schematic diagram of tap displacement sensor:
Tap displacement sensor (tap potentiometer) can be used in the equipment or mechanism which needs to balance left and right. The change of output resistance can be used to judge whether the horizontal plane is balanced. For example, the total resistance of one end and three ends of the tap potentiometer is 10K Ω. At this time, the tap potentiometer is rotated to two sides to measure the output resistance of two ends and four ends, which should be 5K Ω, When the tap potentiometer shaft handle is turned to the middle, the resistance value of 2 and 4 terminals is measured, and the output is 0k Ω (the above example shows that the residual resistance is 0 Ω under ideal condition, but the actual residual resistance cannot be 0 Ω, which will be explained later). That is to say, as shown in the above diagram, the middle resistance value is the minimum, and the resistance value on both sides is the maximum
