Electronic balance selection and use
Electronic balance selection and use First, the user selects an appropriate electronic balance for the scale, span, and accuracy levels based on the accuracy and range requirements of their own weighing. 1 , accuracy requirements To choose an electronic balance, first consider whether the scale value of the corresponding balance is in accordance with the accuracy requirements of the weighing. When selecting the scale value of the electronic balance, reference should be made to the verification index e given by the manufacturer instead of the actual index value d. At present, the national metrological verification regulations stipulate that whether or not the balance is qualified is measured by the test division value, and the allowable error range is (0.5~1.5)e. For scales with scales and auxiliary devices (such as electronic scales), the calibration index value is selected by the manufacturer according to the accuracy level table and the following rules . Note that many electronic scales currently on the market are produced according to the electronic balance standards. e=2d or e=5d or even e=10d, which does not meet the requirements of the national measurement verification e-scale e=d, and should be clearly understood at the time of purchase. 2 , weighing requirements The choice of electronic balance depends on whether the scale's range meets the requirements for weighing. Generally, the maximum load is used plus 20% of the insurance factor. The larger the range, the better, because the larger the scale, the higher the requirement for the balance sensor and auxiliary equipment and the more expensive the price. 3 , the choice of accuracy level The accuracy level of the electronic balance is divided into four levels of accuracy (n=Max/e) in accordance with the balance test score e and the test scale index n. Second, the use of electronic balance environment requirements Electronic balance is easy to use, most electronic balances have a calibration function, so the environmental requirements are not very carved, meet the following conditions can be: 1, the working chamber temperature should be a constant, preferably at about 20 ℃, and to avoid direct sunlight to the balance. 2, the working chamber in the humidity should be preferably (45 to 75)%. 3, no effect on the balance of performance and vibration balance in the surrounding airflow. 4 , balance should be far away from heat and magnetic field. 5 , the work bench should be firm. 6, the working room should be clean, non-corrosive gases. Third, the use of electronic balance precautions 1. The external power supply of the electronic balance should be consistent with the local voltage, such as 220V or 110V. 2, the beginning balance or conveyance installations should be noted that the scale is mounted or demounted (no such apparatus some balance) scale transport protection member. 3, after the balance host and accessories are installed, pay attention to observe whether the parts are in place. In particular, the dust-proof plate and windproof ring cannot be rubbed against the balance. Otherwise it will affect the balance display accuracy. 4. Adjust the balance leveling foot and adjust the balance level. (observe the horizontal device on the balance) 5 , according to the instructions required to connect the power to warm up the balance for at least half an hour or more. 6, the program description method starts calibrating the balance (from outside the school or university) according regularly calibrated balance. (Electronic balances lose their original accuracy due to changes in temperature and other conditions, so they need to be calibrated frequently, especially after a new installation or after a period of inactivity.) 7, the operation does not overload the day usually used to avoid damage to the balance. Construction Safety Net,Against Falling Mesh Net,Mesh Tarps Waterproof,Construction Fence Mesh Shandong Lufan Technical Textiles Co.,LTD , https://www.lufantarps.com