Talking about the four performance indicators of the balance

1, the stability of the balance

The stability of the balance is the ability of the balance to automatically return to their initial equilibrium position after they have been disturbed. For an electronic balance, the equilibrium position is always expressed by the indication of the analog indication or the digital indication. Therefore, once an instantaneous disturbance is applied to the electronic balance, although the indication changes, the balance is eliminated after the interference is removed. If we can return to the original indication, we call the electronic balance stable. An electronic balance, the stability of the balance is the primary criterion for the balance to be used, and an electronic balance that does not have balance stability cannot be used at all.

2, the sensitivity of the balance

The sensitivity of the balance is the ability of the balance to perceive the amount of change in the mass of the object placed on the balance plate. The sensitivity of the balance can be expressed by angular sensitivity, or line sensitivity, or indexing sensitivity, or digital (indexing) sensitivity. For electronic balances, it is mainly expressed by indexing sensitivity, or digital (indexing) sensitivity. The smaller the amount of quality change that the balance can detect, the more sensitive the balance is. It is obvious that for electronic balances, the sensitivity of the balance is still one of the important performances for judging the balance.

3. The correctness of the balance

The correctness of the balance is the correctness of the balance indication. It indicates the ability of the balance to approach the (contracted) true value; from the perspective of error, the correctness of the balance is the degree of systematic error reflecting the indication of the balance.

For a lever balance, the correctness of the balance is mainly reflected in the correctness of the balance arm ratio. However, whether it is a mechanical balance or an electronic balance, the correctness of the balance is also reflected in the correctness of the analog scale or digital scale of the balance, and the correctness of the indication due to the placement of the load at each point on the balance gauge.

4. Invariance of the indication value of the balance

The invariance of the value of the balance refers to the degree to which the balance of the balance is obtained by measuring the same object multiple times under the same conditions.

For electronic balances, there is still the invariance of the balance of the balance, such as the repeatability of the electronic balance, the control of reproducibility, the control of the zero balance of the electronic balance and the error of the zero return. When the electronic balance is unloaded or loaded, the balance is at the specified time. (eg loading 4 hours) the control of the balance shift.