1、 The purpose of reducing the total weight of the goods is achieved by displaying the negative base reserved by the instrument. For example, a truck with gross weight of 15 tons, tare weight of 5 tons, and net weight of 10 tons should be displayed. After the negative base reserved by the instrument is displayed (assumed to be 1 ton), the gross weight of the truck will become 14 tons when it is weighed, and the net weight of the goods will become 9 tons, resulting in a loss of 1 ton. Because it is simple and convenient to operate, it is a fraud method used by outlaws. At the same time, the collusion and collusion between the weighing officers and illegal traders are the prerequisite for the success of this method of fraud. The way to prevent this is as long as the owner of the goods checks whether the display instrument is zero before passing the electronic weighbridge. If it is not zero, you can reset it to zero through the "Zero" or "Tare" key before weighing.
2、 By placing bricks, soil blocks and other hard objects at the bottom of the electronic weighbridge, the purpose of reducing the total weight of incoming goods when weighing is achieved by using the principle of reaction force.
As we all know, when the truck drives to the load bearing table of the electronic weighbridge, the gravity will be transmitted to the load cells at each load bearing point. At this time, the output end of the sensor will generate a voltage signal, which will be amplified through calculation, After A/D conversion, the digital signal is sent to the central processing unit for processing. Finally, it is displayed by the display instrument. Since the weight of the truck is vertically downward, if a certain height of bricks or soil blocks are padded on the bottom of the weighbridge at this time, an upward reaction force will be generated, thus reducing the output signal of the sensor, so that the actual weight of the truck displayed by the instrument will be reduced accordingly.
3、 The output of the sensor is controlled by the increase and decrease keys of the electronic weighbridge, so that the display of the display instrument can be controlled, and the purpose of the scale deduction can be achieved.
4、 Change the normal weighing of the scale through the calibration procedure of the electronic weighbridge instrument. For example, load a 10 ton standard weight and change the display value of 10 tons through the range calibration method to achieve the purpose of weighing the gram scale. Any instrument has a calibration procedure. When the first verification is carried out after installation, most of the instruments must be calibrated by the range to make the weighing error of the scale within the allowable range specified by the state, The scale can only be used after passing the verification. At the same time, the local metrological verification agency will stamp the lead seal on the instrument and prohibit tampering. If the lead seal is damaged, the scale will become invalid if it is qualified. The lead seal will be damaged if the measuring range is calibrated, so as long as our measurement management personnel strictly control the lead seal, this kind of fraud can be eliminated. However, some instruments cannot be sealed with lead. They enter the calibration procedure through passwords or plugs. As long as the passwords and calibration procedures are known, the weighing size of the scale can be changed at will. It is recommended that the manufacturers of these electronic scales make corrections in time, rationalize the design, and facilitate the measurement management of the local measurement and inspection institutions.
Lidong Weighing Apparatus is a professional enterprise dedicated to the professional development and production of electronic weighing apparatus, electronic weighing apparatus, electronic truck scale, electronic ground scale, axle load scale, industrial automatic packaging equipment, automatic batching equipment and other large-scale industrial weighing equipment.
