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Following the principle of "external first, internal later", electronic scales should exclude external factors after a failure occurs. Changes in the external environment will directly affect the electronic scale's weighing. Changes in power supply, vibration, wind power, and lightning will cause the electronic weighing scale to be unstable. Among them, wind and lightning are irresistible, people cannot avoid them, so they should try to avoid using them in thunderstorm weather, and balance the measures of electronic lightning protection and ground protection. Vibration can be reduced by using buffering devices, isolation ditches, and other vibration reduction measures to reduce its impact. If the power supply is impure, the electronic weighing scale can be connected separately or a parameter stabilizer can be installed.
If 1000-level scales are used in two different latitude regions, the numerical value of gravity acceleration needs to be calibrated according to the actual situation. If there is a qualified M1 level or above M1 level public utility unit with standard weight verification, calibration can be done according to their needs, such as gravity acceleration can eliminate the impact value causing scale display, ensuring accuracy. First, for the local weighing range, the selection of weighing points should include the maximum allowable difference value and inflection point; second, when selecting test points, division values, change points, and weighing points should not be selected. Because the index value of the change point happens to be within the local weighing range of the crossing point, if the selected point is tested, then the ratio value is equivalent to imposing a weight value, then the index value will be converted from the original automatic to the actual automatic weighing range. In the test, it is often not tested, in order to ensure the continuous realization of the local weighing range test, the scale will be converted into a local weighing range.
The weighing sensor is a key component of the electronic scale, its gravity acts on the electrical signal, if the weighing sensor fails, it will cause errors in the conversion process, directly affecting the normal operation of the electronic weighing scale. If the area of inspection and use of the electronic weight is different, in the verification process, it needs to be comprehensively considered, for example, the gravity acceleration will affect the scale value. Different latitudes will have different gravity accelerations. The electronic weight directly reflects the actual weight of the item required, and there is a direct relationship between the value and the gravity acceleration.
The display instrument and scale body of the electronic weight are connected by a seven-core shielded cable, used to supply power to the weighing sensor, and to transmit the output signal of the sensor and the junction box to the instrument. Therefore, the shielded cable is usually placed underground, the most fragile parts are the end of the joints and the parts entering and exiting the pipeline. During inspection, the junction box, circuit board, and signal wire plugs should be carefully checked to see if the core wire is securely connected, if there are breaks, if there are short circuits, and if there are places where the cable is easily worn through.
The weighing display instrument usually consists of analog circuits and digital circuits. Structurally, it includes main power supply parts, main circuit boards, display screens, keyboards, and other components. The failure rate of the weighing display instrument is very low, with few usage failures. In addition, the circuit is complex and difficult to inspect. The power supply part can be diagnosed most conveniently by measuring the output voltage of the main circuit board, the simplest operation method is the "substitution method", that is, directly replacing the main circuit board of the circuit board, can quickly determine if the main circuit board has failed.
