Automatic calibration method of electronic scale

Abstract

The invention discloses an automatic calibration method of an electronic scale. The automatic calibration method comprises steps of dividing the maximum measurement scale into multiple sections; acquiring the AD value of a sensor during the zero load of the electronic scale; acquiring the AD value of the sensor when the electronic scale carries an object; judging whether the section where the object is arranged have been calibrated or not; acquiring the sensor AD value when the electronic scale carries the object and a fixed weight; calculating the linear coefficient of the section and marking that the section has been calibrated; and calculating the actual weight of the object so as to finish the automatic calibration of the electronic scale. According to the invention, the sensor is divided into multiple sections with smaller linearity according to the linear characteristics of the sensor, the fixed weight with known weight is used as the reference substance, and the AD value of the sensor, which is acquired in real time, is used for calibrating the linear coefficient of each of the sections, thereby achieving the automatic calibration of the actual weight of the object.

Description

technical field [0001] The invention belongs to the technical field of electronic scale measurement, and in particular relates to an electronic scale automatic calibration method. Background technique [0002] Due to its wide measurement range, high measurement accuracy, and convenient operation, electronic scales are more and more widely used in our daily life. It can be seen in farmers' markets, shopping malls, supermarkets and other places. In order to ensure the accuracy and authority of the weighing of electronic scales, calibration operations are required when leaving the factory. However, due to the physical characteristics of the electronic scale itself and the electrical characteristics of the sensor, after a certain period of use, it will cause inaccurate weighing. . In order to ensure its accuracy during use, the following methods are currently used for processing: (1) When the electronic scale is found to be inaccurate, send the electronic scale back to the man...

AI Technical Summary

Problems solved by technology

In order to ensure the accuracy and authority of the weighing of electronic scales, calibration operations are required when leaving the factory. However, due to the physical characteristics of the electronic scale itself and the electrical characteristics of the sensor, after a certain period of use, it will cause inaccurate weighing.

In order to ensure its accuracy during use, the following methods are currently used for processing: (1) When the electronic scale is found to be inaccurate, send the electronic scale back to the manufacturer or an authority for recalibration. It will generate additional costs and delay the user's time; (2) The user calibrates by himself. When some electronic scales leave the factory, the manufacturer generally leaves background processing for the convenience of later calibration. Users can calibrate themselves according to the manual. This method is not good. If it meets the requirements, the user can modify the calibration value at will, and cheat; (3) software processing, some electronic scales have been optimized in software, such as using multiple average values ​​during measurement, or performing measurement offset tracking. This method can delay the time of inaccurate measurement, but as the use time is longer, due to the characteristics of the device itself, it will still cause inaccurate measurement, which cannot fundamentally solve the problem, and when the offset is large to a certain extent, The software also cannot be calibrated

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