After a weekly calibration of an electronic scale, it takes several months or even six months to recalibrate. During this period, the accuracy of electronic scale usage must be ensured. Although it is stipulated that the accuracy of use is half of the verification accuracy, the changes in seasons such as spring, summer, autumn, and winter, as well as the high ambient temperature, will inevitably have a significant impact on the accuracy of electronic scales. Due to the fact that the vast majority of Class III commercial scales are placed in factories or outdoors, the effects of wind and dust, industrial vibration, electromagnetic interference, and vehicle rolling all have a significant impact on the long-term accuracy of electronic scales. Therefore, it is crucial to ensure that electronic scales can accurately weigh in long-term measurement work, which is the key to the problem. So we say that electronic scale calibration is the means, and long-term high-precision measurement is the goal.

Electronic balance manufacturerThe key to ensuring long-term, stable, and accurate weighing of electronic scales is not only related to the quality of the scale itself and the installation of high-quality electronic scales, but also closely related to the reasonable setting of the scale's division number. Specifically, the display and sensor of the electronic scale are the key to setting the degree of measurement. Especially for sensors, their various quality indicators are closely linked to the setting of the graduation number.

The majority of sensors used in Class III commercial scales have a linearity between ± 0.02% and ± 0.05%, which is an inherent error of the sensors. The error of a sensor is as small as ± 0.02%, and an electronic scale is generally composed of multiple sensors. Add sensor supply bridge voltage fluctuation error. The comprehensive error of a scale sensor is always greater than that of a single sensor, and the accuracy will not exceed ± 0.03% to ± 0.05%, no matter how high it is. The hysteresis error, repeatability error, creep and creep recovery, zero drift, and temperature drift of sensors all affect the improvement of sensor accuracy.

As a key component of electronic scales, the accuracy of the display cannot be ignored. The linear error of signal amplifiers in displays, the conversion error of A/D converters, and the adjustment error of bridge voltage not only directly affect the display accuracy of displays, but also directly affect the accuracy of electronic scales.

Considering the adverse factors such as the force error of the scale body itself, interference and distortion in signal transmission, damage caused by vehicle rolling, and environmental factors that affect the electronic scale, it is objectively feasible to set the division number of the electronic number to 2000~3000 as the optimal division number. The accuracy of the electronic scale is initially checked at ± 0.05% and in use at ± 0.1%.

From the perspective of the accuracy and grading settings of foreign electronic scales, as well as the calibration standards of domestic scales and the accuracy of current statistical electronic scale grading, and from the tolerance regulations of OIML for Class III scales, it is evident that the grading settings of 2000~3000 for existing Class III commercial scales are relatively ideal and belong to the optimal grading range. This setting determines the accuracy of the electronic scale, with a first check accuracy of ± 0.05% and a correctness, rationality, and necessity of ± 0.1% during use.