Electronic scale calibration methods and steps are optimistic about the seven key points

The electronic scale is a kind of weighing instrument. To put it bluntly, it is to look at the weight. Many people have it at home. The most important thing about the electronic scale is the accuracy. If the measurement is not accurate, then it loses its meaning. How to calibrate the electronic scale, Xiaobian to talk about the electronic scale calibration method and steps:

Electronic scale calibration method:

1. The illegal calibration of the electronic weighing instrument is carried out by using the quality value of the standard weight and the allowable range of the calibration code value of the calibration program, because the calibration digital value has a certain range of space (for example, the electronic weighing scale with a maximum weighing capacity of 150 kg, its The 50kg internal code value can be calibrated to a display value of 50kg in the range of 12000 to 18000.

If the actual weight of the calibration weight is 49kg, the displayed value is 50kg, then the actual weight of the scale is 150kg when it is 150kg. What kind of consequences this kind of scale will have in the market trade, it is self-evident. This is the importance of legal measurement in the national economy.

2. After installation, check whether the connection of each part of the scale body is intact. The scale body should not be in contact with any part of the foundation. The distance between the scale body and the surrounding edge protection iron is 10mm~15mm.

3. Before commissioning, first turn on the power switch to preheat for 15 minutes, and try to use the vehicle with the load capacity close to the maximum weighing. Repeat the multiple passes and brake on the bearing platform. Tighten the high-strength bolts of each weighing sensor with a torque wrench.

4. Use the digital voltmeter to measure the output voltage of each load cell in turn. If there is any inconsistency, adjust the corresponding two precision adjustable resistors in the junction box to reduce the mutual difference. However, the adjustment must pay attention to the fact that the two adjustable resistors have the same direction of rotation and the same amount of rotation. When the clockwise rotation, the resistance decreases, the output voltage becomes larger, and the display value increases. Otherwise, the reverse is true. Until the adjustment to the output of each load cell is consistent.

5, debugging can generally be carried out by the weight method, that is, the weight of 1/10 maximum weighing is placed in the center position of the load-bearing platform and the load-bearing platform above each load cell, and the weighing sensor is accurately measured by the real difference method. The difference between the outputs and the two precision adjustable resistors of each of the load-bearing load cells are respectively adjusted to reduce the amount of difference between them, but the rotation direction and the amount of rotation are also the same.

6. After the key is adjusted, the weight corresponding to the maximum weighing is evenly added to the bearing platform. According to the position and method described in the instructions of the various weighing displays, the display value and the weight value are consistent. Lower the weight and confirm that the empty scale is displayed as "0".

7. Finally, divide the maximum weighing into several parts, including the minimum weighing, maximum weighing and tolerance change of the weighing scale, and the weighing error of each point is not greater than the maximum tolerance of each measuring point. .

Electronic scale crash processing method:

The electronic scale is a combination of modern sensor technology, electronic technology and computer technology. It is fast, accurate, continuous and automatic. The electronic scale is mainly composed of a load cell, an amplifying circuit, an AD conversion circuit, a single chip circuit, a communication interface circuit and a voltage stabilizing circuit. For ordinary users, the internal structure of the electronic scale is extremely complicated, and the problem is often overwhelmed. For example, how do we handle the electronic scale suddenly crashing? Let us introduce some simple processing methods, of course, if it is more complicated. The problem should still be looking for professional electronic scale maintenance:

1. Check if the 220V power supply is normal;

2. Whether the voltage regulator circuits inside the electronic scale are normal;

3. Check if the power supply voltage of the printer is normal, and whether the current is too large when printing;

4. Check whether the voltage of the AD circuit is normal or not, otherwise check if the sensor is normal.

5. Check whether the digital circuit power supply of the circuit board is normal. Focus on the crystal oscillator components, which may be damp or damaged.

6, the electronic scale often crashes, mainly check the capacitive components on the circuit board, whether the capacity is reduced or leakage.

7. After the electronic scale is turned on, the digital instability or hop count is displayed. It belongs to the AD circuit or the sensor is bad. It is important to check that the voltage of this part must be stable and normal.

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