What Are the Technical Specifications of High Precision Electronic Scales?

The current situation of electronic scales

In the mid-1950s, the deepening of electronic technology promoted the development of the weighing industry; since the early 1960s, with the emergence of electromechanical combined electronic scales, electronic scales have been continuously improved and perfected for more than forty years, evolving from the original electromechanical combined type to the current full electronic and digital intelligent type; the weighing technology of electronic weights has basically reached the level of the mid-1990s internationally, with a few products already at the forefront internationally.

The electronic weighing technology has evolved from static electronic scales to dynamic electronic scales; the measurement method of electronic scales has evolved from traditional analog measurement to digital measurement; the fusion of weighing data in electronic weights has evolved from single weighing sensor information fusion to multi-sensor information fusion, with temperature sensors and inclinometers widely applied to electronic scales. However, there is still a gap in the quality and quantity of electronic scale products compared to foreign products, mainly due to the technology and production processes of weighing sensors and electronic scales, lack of research and development capabilities and potential, limited functions and variety of products, and poor long-term stability and reliability.

Technical indicators of high-precision electronic scales

Actual division value. The actual division value refers to the difference between two adjacent display values.

Calibration division. It is the value expressed in mass units used for grading and calibration scale. The range for calibration division values is: d ≤ e ≤ 10d.

Calibration division number: the quotient of maximum weighing capacity and calibration division value: n = Max/e. Where Max is the maximum weighing capacity, indicating the maximum weighing capacity of the electronic weight excluding tare weight. This indicator reflects the relative accuracy of the piece weight scales.

Electronic scales are divided into four accuracy levels according to the calibration division value and calibration division number: special accuracy level (Ⅰ), high accuracy level (Ⅱ), medium accuracy level (Ⅲ), and general accuracy level (Ⅳ).

Maximum permissible error: When the electronic weight is empty in a standard position, the indication value should not exceed the maximum permissible error of the corresponding load, which is the maximum positive or negative difference allowed in the technical specifications.

Indication error: Indication error refers to the difference between the indication value of the electronic scale and the agreed true value; the indication error at each load point during loading or unloading should not exceed the maximum allowable error requirement of the corresponding load.

Repeatability: Repeatability is defined as the ability of the electronic weight to provide consistent weighing results under the same test conditions, using the same method to repeatedly apply the same load to the load receptor. Repeatability refers to the difference between the results obtained from repeatedly weighing the same load, which should not exceed the absolute value of the maximum allowable error of the corresponding load.

Load error: The difference in indicating values at different positions under the same load; the indication error should not exceed the absolute value of the maximum allowable error for the loaded load. For support points of the load receptor fewer than 4, load about one-third of the maximum weighing and maximum added tare weight at each support point.

Discrimination: Discrimination reflects the piece weight scale's ability to respond to small changes in load; for digital display electronic scales, on a balanced electronic scale, gently adding or removing an additional weight equal to 1.4d, the original indication value should change.

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