Definition of scientific term Chinese name: shelf balance English name: mount pan balance Definition: Equal-arm lever type double-plate balance. Applied science: mechanical engineering (a subject); laboratory instruments and devices (two subjects); balance instrument - name of Tianping (three subjects) The main purpose Mainly used for medical and health, industrial and mining enterprises, agriculture, science and technology and other units weighing. Main Specifications Model Maximum Weighing Minimum Weighing Scale Maximum Weighing Storage Plate Diameter Dimensions Net Weight JPT-1 100g 0.1g 5g 80mm 190×80×138 0.4kg JPT-2 200g 0.2g 5g 84mm 210×84×138 0.45kg JPT-5 500g 0.5g 10g 120mm 300×120×175 0.72kg JPT-10 1000g 1g 10g 134mm 350×134×185 1.2kg maintenance 1. If the balance is not used for a long time, apply some butter on the knife and sipe, place it in the box and store it in a dry place. 2. It is necessary to remove the dirt in the sipe. Generally, the screw of the middle knife blade behind the front and the front of the tray balance should be unscrewed, and the middle knife file should be taken out. Then, from the notch of the left and right side of the knife holder, remove the side knife holder, wipe it, and then install it as it is. 3. Place the balance on a stable work surface to avoid vibration, airflow and sunlight. 4. Adjust the level bubble to the middle position before use. 5. The electronic balance should be preheated according to the requirements of the manual. 6. When weighing volatile and corrosive items, place them in a closed container to avoid corrosion and damage to the electronic balance. 7, often self-school or regular external school electronic balance to ensure that it is in the best condition. 8. If the electronic balance fails, it should be repaired in time, and it is not allowed to work with “illnessâ€. 9. The operating balance should not be overloaded to avoid damage to the balance. 10. If you do not use an electronic balance for a long time, you should temporarily collect it as well. Precautions for use The temperature of the 1 balance test room should be kept within (15~30) °C, and should not be affected by vibration, airflow and other strong magnetic fields to avoid direct sunlight. 2 When rotating the switch, it must be slow and even. If it is too fast, the blade will be touched and damaged, and the measurement error will occur due to excessive shaking. 3 When the weight is checked, the weight should be placed in the center of the weighing pan and must not exceed the maximum load of the balance. 4 When taking the weight of the ring, be gentle. Do not turn the dial knob too quickly to make the ring weight jump or shift. How to reduce the error of electronic balance The calibration method is divided into internal calibration and external calibration. Saudi Arabia produced in Germany, METTLER produced in Switzerland, and the average analytical production balance of Shanghai Yueping Production Analytical Balance. If you do not read the instructions carefully before use, it is easy to ignore the “calibration†operation, resulting in a large weighing error. The following is a series of precision electronic balances produced by Wantai Instrument Factory as an example to illustrate how to externally calibrate the balance. Method: Press the CAL button when the CAL- appears on the display, the display will appear CAL-100, where “100†is the flashing code, indicating that the calibration weight requires a standard weight of 100g. At this point, the "100g" calibration weight is placed on the weighing plate, and the display will appear in the "----" waiting state. After a long time, the display will appear 100.000g, and the calibration weight will be taken. The display should show 0.000g. If the occurrence is not zero, then clear it again and repeat the above calibration operation. (Note: In order to get accurate calibration results, it is best to repeat the above calibration procedure twice.) Use the FA series laboratory precision balance as an example to illustrate how to perform calibration within the balance. The method is as follows: the balance is set to zero, and then the “CAL†key is pressed until the CALint appears. The following conditions will be displayed during calibration: the balance is zero. The internal calibration weight is loaded. The balance is rechecked. The balance is reported. After the calibration, the balance automatically returns to the weighing state. 1. Some people think that the electromagnetic force is balanced with the gravity of the object being weighed. As long as the weighing amount within the allowable range has little effect on the balance, it will not be weighed for a long time. Affect the accuracy of electronic balances. 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