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An important feature of an electronic balance is that it does not measure the weight of the weight when measuring the mass of the object to be measured, but uses the principle that the electromagnetic force is balanced with the gravity of the object to be measured. The weighing pan is connected to the coil through a bracket link, and the coil is placed in a magnetic field. When the weighing range is within, the gravity mg of the measured object acts on the coil through the connecting rod bracket. At this time, if a current flows in the magnetic field, the coil will generate an electromagnetic force F, and the direction is upward, which can be expressed by the following formula: F =KBLI
Where K is a constant (related to the unit of use), B is the magnetic induction, L is the length of the coil wire, and I is the current intensity through the coil wire. The electromagnetic force F and the gravity of the object to be measured on the weighing pan are equal in magnitude and opposite in direction to balance, and the weighing pan bracket is returned to the original position under the action of the elastic reed. That is, the energized coil in the magnetic field, the current I flowing through it is proportional to the mass of the object to be measured, and the mass m of the object can be known as long as the current I is measured.
During the use of the balance, the sensors and circuits are affected by temperature during the working process, or changes in certain parameters caused by changes in the working time of the sensor, as well as environmental factors such as airflow, vibration, electromagnetic interference, etc., will make the electronic balance Drift occurs, causing measurement errors. Among them, the influence of ambient temperature such as airflow, vibration, electromagnetic interference can be limited by the use conditions of the electronic balance, and the degree of influence is minimized. The temperature drift is mainly caused by the influence of the ambient temperature and the internal influence of the balance. The cause of the formation is complicated, and the drift generated is large and must be suppressed.
4 performance indicators for purchasing electronic balances
1 Stability of the balance <br> The stability of the balance is the ability of the balance to automatically return to their initial equilibrium position after they have been disturbed. In the case of the BL-P series precision balances, the balance position is always expressed by the indication of the analog indication or the digital indication. Therefore, once the instantaneous disturbance is applied to the electronic balance, although the indication changes, After the interference is removed, the balance can return to the original indication, and 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 balance sensitivity
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 balance correctness
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<br> The invariance of the indication value of the balance refers to the degree of agreement between the measured results 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.
The weighing principle of the electronic balance and the four performance indicators of the balance
A brief description of the weighing principle of an electronic balance:
Unlike other types of balances, electronic balances use modern electronic control technology for weighing. Regardless of the control method and circuit structure, the weighing basis is based on the principle of electromagnetic force balance. It is characterized by accurate and reliable weighing, fast and clear display and automatic detection system, simple automatic calibration device and overload protection.
If the scale is added or removed from the disc, the balance is unbalanced, the position detector detects the transient displacement of the coil in the magnetic steel, and a variable output is generated by the PID regulator and the preamplifier. After a series of treatments, the current flowing through the coil is changed, so that the electromagnetic force also changes and cancels with the object to return the coil to the original position to reach a new equilibrium state. This is the principle of the electromagnetic compensation automatic compensation circuit of the electronic balance. The change in current shows the mass of the object being weighed by the number.
Simply put, the choice of balance is the key to the four performance indicators in the design and use of the balance: stability, sensitivity, correctness, invariance.