How to deal with electronic balance (Jinghua) when it cannot be outside the school

Electronic Balance is a kind of precision electronic instrument, which often encounters the problem of large measurement error, so it needs to be calibrated, especially before using it for a long time. However, when we calibrate, we may find that sometimes it is impossible to perform external calibration, and we can do the following:

Electronic Balances can generally be calibrated externally, and of course some balances also have internal calibration functions. Regular external calibration can not only ensure the sensitivity of the balance, but also ensure that the data of the electronic balance is accurate and reliable. However, when the electronic balance cannot perform external calibration, it should be shut down for maintenance in time.

(1) Cause of failure

1. Operation error.

2. The installation environment of the electronic balance does not meet the requirements.

3. The balance is not level.

4. The balance is not at zero before calibration.

5. The error of the external calibration weight is too large.

6. There is a mechanical failure in the weighing system of Shanghai Jinghua Electronic Balance.

7. The internal program of the electronic balance is in the state of rejecting external calibration.

(2) Repair method

1. Review the manual of the electronic balance, and perform external calibration as required.

2. Change the installation environment of the electronic balance or modify the relevant built-in programs to make it meet the environmental requirements.

3. Adjust the balance to make it level.

4. Make the balance display zero position stably before calibration.

5. Select a standard weight that meets the accuracy requirements of the school's electronic balance for calibration.

6. Overhaul the mechanical failure of the electronic balance weighing system.

7. Change the internal program of the electronic balance so that it is in the state of performing external calibration.