The accuracy level of the force measuring instrument includes the non-linearity, creep, repeatability, hysteresis, sensitivity and other technical indicators of the sensor. When selecting the sensor, the high-level sensor should not be blindly pursued, and the accuracy level and cost of the electronic scale should be considered.

In general, the total accuracy of the selected sensor is nonlinear, and the root mean square value of the sum of the three indicators of non-repeatability and lag is slightly higher than the accuracy of the scale.

The accuracy level of a force measuring instrument refers to the reliability of the measurement results. It expresses the ability to repeat a certain reading with a given accuracy. The smaller the error, the higher the accuracy of the sensor. Both the sensor and the instrument have an accuracy of generally 1\/3000 , Generally, domestic force measuring instruments belong to the C3 level, C3 means 3000 divisions, and the accuracy is 1\/3000, and the accuracy of foreign imported force measuring instruments will be relatively higher.

First of all, it must meet the requirements of the input of the weighing display instrument. The output signal of the force measuring instrument is amplified, and the A\/D conversion process shows the indicator of the weighing result. In view of this, the output signal of the sensor should not be smaller than the required instrument The size of the input signal, that is, the output sensitivity of the sensor, is substituted into the matching formula of the sensor and the instrument, and the result is greater than or equal to the input sensitivity of the instrument.

The matching formula of the load cell sensor and the meter:

Sensor Output Sensitivity Excitation Power Supply Voltage Maximum Weighing Scale

Sector Size Sensor Number Range of Sensors

Set the quantitative packing scale of the force measuring instrument, the weight is 25KG, the index of the largest number of departments is in 10003 L-BE-25 sensors, the range is 25kg ± 2.00.008mV\/V, the 12V arch bridge voltage sensitivity is with the body scale, the scale AD4325 Instrumentation. When asked about the matching between selected sensors and instruments.

Check the sensitivity of the input to AD4325 meter is 0.6μV\/D, and the instrument of the Yading sensor and the meter match the current input signal: 21225\/1000325=8μV\/D is greater than 0.6μV\/D, so it is satisfactory to simplify the sensor's The output signal should not be smaller than the size of the input signal required by the instrument so that they match.

In addition to the input requirements of the force measuring instrument, the load cell level also needs to meet the requirements of the accuracy of the entire electronic scale. Usually, the electronic body scale consists of scales, sensors, and meters, which are slightly larger than the theoretical value. When the accuracy of the load cell is selected, the accuracy of the Force measuring instruments, but due to theory, are usually restricted by objective conditions, for example, the performance of the scale body is almost the instrument is not very good strength, the large-scale working environment is relatively poor because of the direct influence, the accuracy of the scale, and therefore To improve the requirements of various aspects, when choosing the accuracy of the force measuring instrument, the accuracy of the force measuring instrument should be slightly greater than the theoretical calculation value, but because the theory is generally restricted by objective conditions, for example, the strength of the scale body is a little worse, the instrument The performance of the scale is not very good, the working environment of the scale is relatively poor, etc., which directly affect the accuracy requirements of the scale, so the requirements must be improved from all aspects, not only considering the economic benefits, but also ensuring that the purpose of weighing is achieved.