What is the basic technical performance of weighing indicator

There are many weighing indicators for evaluating instrument performance. The main indicators for measuring the basic performance of measuring instruments are as follows. 1. Accuracy and accuracy grade of the instrument The accuracy of the instrument is the main performance index for evaluating and selecting the instrument. It shows the reliability of the data measured by the instrument. There are three indicators of accuracy: precision, accuracy and precision (abbreviated as accuracy)

1:Precision δ It shows the dispersion of the indicated value of the instrument. That is to say, for a certain stable measured by the same measurer, using the same instrument, the meter will repeat the measurement many times in a relatively short time, and the measurement result (indicating Value) the degree of dispersion. The smaller the δ, the more precise the measurement. For example, the precision of a temperature instrument δ=0.2℃, which means that the dispersion degree of multiple measurement results is not more than 0.2℃. Precision is a sign of the size of random error. High precision means small random error. But it must be noted that precision and accuracy are two concepts, and high precision is not necessarily accurate.

2:Accuracy It shows the degree of deviation between the true value and the value indicated by the weighing indicator. For example, the accuracy of a certain flow meter e=0.3m3/s, which means that the indication value of the meter deviates from the true value by 0.3m3/s. The accuracy is a sign of the system error, with high accuracy. Means that the system error is small. The same accuracy is not necessarily precise.

3:Accuracy It is a comprehensive reflection of precision and accuracy. High accuracy means that both precision and accuracy are relatively high. In general, the algebraic sum of the two can be taken, namely r=8+c. Accuracy is often expressed as a relative value of measurement error.