Differences Between Analog Weighing Instrument And Digital Weighing Instrument

According to different signal sources, electronic weighing instruments can be divided into analog weighing instruments and digital weighing instruments. As the name implies, it can be seen from its name and different signal sources that these two weighing instruments are different. Below, zhuohe weighing instrument company will introduce the different structural principles of these two weighing instruments in detail, so that you can choose the most appropriate one in the future purchase process.

Digital weighing instrument. The digital weighing instrument receives digital signals, so it can only be connected to digital sensors. There are many kinds of digital sensors and various protocols, but they all communicate through RS422 or RS485. The more famous ones are HBM in Germany, Kubota sensor in Japan, and Jinzhong SP sensor in China, including DMP and Jinzhong scale. The digital weighing instrument does not need small signal amplification circuit and a / D conversion part. These functions are completed in the digital sensor. The function of the digital weighing instrument is to provide the communication interface and protocol corresponding to the digital sensor, and includes display circuit, keyboard, data output part (including parallel port output or RS232 serial port output or RS485 output), other peripherals (such as current loop output Analog output, dry contact output, etc.).

Analog weighing instrument. The analog weighing instrument receives analog signals, and the scale body uses analog sensors. Analog weighing control instruments generally include small signal amplification circuit, a / D conversion part, micro controller or processor, display circuit, keyboard, data output part (including parallel port output or RS232 serial port output or RS485 output), other peripherals (such as current loop output, analog output, dry contact output, etc.). The signal output by the sensor or signal source is relatively small, generally between 0 ~ 2mV. The A / D conversion cannot process such a small signal, so it should be amplified through the small signal amplification circuit. Some a / D conversion chips have built-in amplification circuits, so the small signal amplification part can be omitted. After amplification, the small signal is converted into digital signal through a / D conversion circuit, and then output to the processor. The processor outputs the data to the display circuit and other output peripherals after digital filtering and other algorithm processing.

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