The basic principle of adjusting the bubble of the level to the middle position before using the electronic balance:

 1. The balance is placed on a stable workbench to avoid vibration, airflow and sunlight.

2. Adjust the bubble of the spirit level to the middle position before use.

3. The electronic balance should be preheated according to the instructions.

4. When weighing volatile and corrosive items, they should be placed in a closed container to avoid corrosion and damage to the electronic balance.

5. Frequently conduct self-calibration or regular external school to the electronic balance to ensure that it is in a normal state.

The load of the electronic balance should not be overloaded. Reason explanation:

The load of the electronic balance should not be overloaded. The object should be placed on the tray. Switch the balance lightly. When adding or removing objects or weights, first turn off the balance lifting knob. Do not add or remove objects or weights when the balance is open to avoid vibration damage to the knife edge of the balance.

As a tool for calibrating and inspecting weighing instruments, standard weights play a key role in calibration and are a universal tool for calibrating electronic balances. But calibrating an electronic balance with a weight is not just a matter of just picking up a weight, you need to choose a suitable weight to calibrate the balance accurately.

Standard weight is a kind of physical measuring tool that can reproduce the quality value. It has physical and measurement characteristics. The measurement organization has made a clear classification of standard weights. The weight grades are divided into 9 grades: E1 grade, E2 grade, Class F1, Class F2, Class M1, Class M12, Class M2, Class M23, Class M3. The so-called equal refers to the uncertainty of the weight, with a correction value; the level is the indication value error, without a correction value, the weight indication error is qualified if it is within the allowable range.

The weighing result of the electronic balance is unstable, which may be due to the following reasons:

1. Check whether there is any sundries between the weighing pan and the electronic balance shell;

2. Check the windshield of the electronic balance to see if it is not completely closed;

3. Check whether the windshield is rubbed against the scale;

4. Observe whether there is strong electromagnetic interference nearby;

5. Check the placement of the sensor and whether the connection part is in good contact.