Four performance indicators in balance design and use: stability, sensitivity, correctness, and invariance.
1 Balance stability
The stability of the balance refers to the ability of the balance to automatically return to their initial equilibrium position after being disturbed. Take the BL-P series precision balance, its balance position is always represented by the indication value of analog indication or digital indication. Therefore, once a certain instantaneous interference is applied to the electronic balance, although the indication value changes, but After the interference is eliminated, the balance can return to the original indication, then we call the electronic balance stable. For an electronic balance, the stability of the balance is the primary judgment condition that the balance can be used, and an electronic balance that does not have the stability of the balance cannot be used at all.
2 Balance sensitivity
The sensitivity of the balance is the ability of the balance to detect the amount of change in the mass of the object placed on the balance balance dial. The sensitivity of the balance can be expressed by angular sensitivity, or line sensitivity, or index sensitivity, or digital (index) sensitivity. For electronic balances, it is mainly expressed by indexing sensitivity, or digital (indexing) sensitivity. The smaller the amount of mass change that the balance can detect, the more sensitive the balance. It can be seen that for electronic balances, the sensitivity of the balance is still one of the important performances to judge the balance.
The correctness of the 3 balance
The correctness of the balance is the correctness of the balance's indication. It indicates the ability of the balance's indication to approach the (consensus) true value. From the perspective of error, the balance's correctness is the degree of the system error that reflects the balance indication.
For lever balances, the accuracy of the balance is mainly reflected in the accuracy of the balance arm ratio. However, whether it is a mechanical balance or an electronic balance, the accuracy of the balance is also reflected in the accuracy of the indication of the analog scale or digital scale of the balance, and the accuracy of the indication when the load is placed at each point on the balance balance dial.
4 Invariance of balance indication
The invariance of the balance display value refers to the degree of consistency of the measurement results obtained when the balance measures the same object multiple times under the same conditions.
For electronic balances, there is still the invariance of the balance display value, such as the control of the repeatability and reproducibility of the electronic balance, the control of the zero position and zero return error of the electronic balance, and when the electronic balance is empty or loaded, the balance is within the specified time (For example, 4 hours of loading) Control of balance indication drift.
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