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In automated industrial production and civil weighing systems, most of the conventional analog signal load cells are used. The analog load cells currently in use, due to the analog signal generated by the principle of resistance-strain conversion, need to pass the analog signal in the application. transmitter into analog voltage or analog current. It has accumulated a lot of experience in manufacturing process, circuit compensation and adjustment, signal conditioning, etc., so it has a wide range of applications. However, its output signal is small, the transmission distance is short, the anti-interference ability is poor, the compensation items interact with each other, and the circuit compensation and adjustment process are complicated, which is not only time-consuming and labor-intensive, but also has low compensation accuracy; the weighing display control instrument is complex, and installation and debugging are inconvenient. Defects such as congenital defects determine the development of analog load cells in the direction of digital, which can only be parasitic in the digital conversion unit outside the strain bridge to change the analog signal into a digital signal.
Therefore, a digital conversion approach has emerged. One is to convert the output signal of an analog load cell into a digital signal output through a digital transmitter installed inside it, which is usually called a digital load cell. Namely: analog load cell + digital transmitter = digital load cell
The digital sensor adopts integrated A/D conversion circuit, digital signal transmission and digital filtering technology. The signal transmission distance of the sensor is long, and the anti-interference ability is strong. At the same time, the sensor itself is a good shielding cover. Only these two The characteristics determine the advantages of its anti-interference ability, which greatly improves the stability of the sensor. The digital load cell converts the traditional sensor analog signal into a high-precision RS485 digital signal, which can be free of calibration. It is used in industrial control systems and can be used for direct data transmission with PLC or load force information of intelligent instruments and other applications. converted into a digital signal.
