Repair of common electronic pricing scale
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. Pricing scale structure principle
The principles of cost-calculating scales are relatively simple. The principle circuit and structure of various specifications and model-computing scales are also similar. However, the electronic scales produced by various manufacturers have their own characteristics in the selection of circuit components and process technology.
The circuit structure of the pricing scale is composed of a power supply, a load cell, an analog signal amplifier, an analog-to-digital converter, a single-chip microcomputer, a drive display, a keyboard, and a printout interface.
---- The basic working principle of the weighing scale: The gravity acting on the object makes the Wheatstone bridge formed by the strain gauge on the elastic body of the weighing sensor generate a signal signal of about 0-25V (signal size and The weight is proportional to), and the analog signal amplifier amplifies the sensing signal to about 0~3V, and then the analog voltage is converted into an internal code number through an analog conversion circuit. Finally, the unit price is set by the SCM, the amount is calculated, various parameters are sent, and data such as weight, amount, and unit price are displayed through the display.