Electronic scale part of the error reason
The error of the electronic scale is a quantitative description of the accuracy of the symmetrical quantity results, and the electronic scale often encounters errors in the application. The error problem not only affects the reliability of the use of the electronic scale, but also affects the interests of the electronic scale user. From the weighing performance of electronic scales, understanding the causes of electronic scale errors helps to improve the quality and efficiency of electronic scale verification work.
The electronic scale is a weighing platform that transmits the gravity of the object to the load cell, so that the elastic body of the sensor is deformed, and the output voltage signal is excited by the excitation voltage, amplified by a linear amplifier, and then converted into a digital signal by the microprocessor. The quality signal is directly displayed after processing the quality signal. The weighing error of the electronic scale is mainly derived from different components.
Through the thorough understanding of the electronic scale, different components of the electronic scale will produce different errors. The following are some of the reasons for the error. Let us know.
One and four corners
The eccentric load test requires that after the electronic scale is loaded, the measured weight changes on the weighing platform without causing a change in the weighing result. Therefore, the error of the four-sided eccentric load comes from the collar sensitivity of the load cell. The absolute sensitivity of each load cell is different, resulting in the same excitation voltage, but each load cell signal output is different, resulting in a four-corner offset error. In order to reduce the four-corner eccentricity error, the electronic scale is connected to the potentiometer in the branch of each load cell, and the signal output of each branch can be balanced by adjusting the resistance value and using different voltage divisions of different resistors.
Second, the weighing error
The linear variation of the sensor's weighing and the zero drift are the direct causes of the weighing error.
1. Linear variation of sensor weighing: Due to temperature difference, impact force, floating and sinking, etc., the load between the sensor and its corresponding output voltage is not linear, which makes the weighing of the electronic scale sensor change greatly.
2. Zero drift: The electronic scale is affected by different and multiple reciprocating impact loads during use. The force of the sensor is very complicated, which will cause the sensor contact to change, causing the original state of the calibration to change, causing zero drift. , producing errors.
Third, the discriminating power error
The discriminating power reflects the ability of the electronic scale to respond to changes in the load. The purpose of the discriminating force test is to verify the connection and friction of the scale structure. Therefore, the friction and reaction force in the mechanical connection are the cause of the discriminating force error, and the weighing sensor and scale The resolution of the heavy instrument has a great influence on the discriminating force error.
Fourth, the repeatability error
Repeatability error The difference between the output of the load cell obtained from successive process tests under the same load and the same environmental conditions. It is caused by some relatively fixed factors. In addition to the repetitive error caused by changes in environmental conditions such as temperature, humidity, wind, and gravitational field during weighing measurement, it is mainly the electronic scale sensor lateral force and sensor. Repeatability errors caused when conditions are not met.
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