Function principle of weighing sensor-Part 1
The measurement of weighing sensor adopts the principle of strain gauge,which is fixed on the elastomer.Extermal force causes the elastic body to deform, and the strain gauge on the elastic body deforms accordingly.As the shape of strain gauge changes, its resistance value will change accordingly.The strain gauge in the upper left and lower right corner is compressed, the resistance film becomes shorter and the resistance value becomes smaller.The strain gauge in the upper right and lower left corner is stretched, the resistance film becomes longer and the resistance value becomes larger.For each weighing sensor, at least 4 strain gauges are connected together to form a wheatstone bridge.The bridge is unbalanced when the strain gauge resistance changes due to the force on the sensor.Under the condition of constant excitation voltage, the output signal is proportional to the force exerted on the sensor.
For the four-wire sensor, there are only four cables as shown in black below. EXC+ and EXC- are the excitation of the weighing module to the sensor, and SIG+ and SIG- are the outputs of the weighing sensor.For a six-wire sensor, there will be two more red wires:
See Function principle of weighing sensor-part 2 for more information.
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