Electronic balance features and precautions
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In recent years, China has produced a variety of models of electronic balances, but because the price of electronic balances is several times to ten times higher than mechanical balances, it is not yet popular in China.
The general operation method of the electronic balance is: preheating for a certain time (according to the instructions); adjusting the level; after the zero point display is stable, use the standard anvil code to calibrate; remove the standard anvil code, the zero point display can be stabilized Weighing. For example, when using a small beaker to weigh the sample, you can first open the small beaker with a clean bath in the center of the weighing pan. After the number is stable, press the “Tare†button, the display will return to zero, and then slowly add the sample to the display. When the quality of the sample is required, stop the sample loading and directly record the quality of the sample. Do not use the electronic balance for two time, you can not turn off the electronic balance power switch, so as not to re-energize and warm up when you use it again.
The balance of the electronic balance is the top of the electronic balance - the gravity electromagnetic sensor reed (generally 6 to 8 pieces) is thin and thin, easily damaged, and the higher the accuracy of the electronic balance, the gravity sensing reed The thinner, so special care should be taken during use. Do not load objects on the electronic balance that exceed the weighing range. Never press the weighing pan or drop the electronic balance to avoid damaging the electronic balance or gravity. The performance of the sensor changes, and an object, especially a heavier object, is usually weighed, typically no more than thirty seconds. The weighing pan and its tray should be removed when moving and transporting.
Second, the electronic balance is actually an instrument that measures the gravitational force of the earth on an object that is open on the scale, that is, gravity. However, due to the difference in the latitude of the earth's diameter, the gravitational acceleration (9-9.8 m2/s) is not the same. The accuracy of the local weighing depends on whether the correct calibration and the accuracy of the calibration weight are performed. If you find that the electronic balance corrected by Shanghai Haoyu Electronic Technology Co., Ltd. in Shanghai, the weighing in your place of use is certain. The error does not mean that there is any fault in the electronic balance. Please refer to the method described in the manual of each model for accurate weighing by using the standard weight recognized by the metrology department.
Third, the electronic balance correction mechanism is generally divided into three categories:
Fully automatic calibration: internal standard weight and motor servo mechanism, just press a function key to complete the calibration in tens of seconds. Generally, the new type of universal electronic balance, the electronic day with an accuracy of more than one tenth of a gram. On average, a fully automatic correction mechanism is used;
Semi-automatic calibration: Built-in standard weight but no servo mechanism, after entering the calibration procedure, you need to manually load and remove the calibration code;
Manual calibration: There is no standard anvil code and servo mechanism in the electronic balance. Manual calibration is required and the standard weight is added for calibration. The electronic balance with low accuracy is manually corrected.
4. The electronic balance is a precision electronic measuring instrument that is highly sensitive to the environment. It should be handled with care. The installation table should have no obvious vibration. Do not open it in the air conditioning port. If these conditions are not met, some improvement measures should be taken, such as changes. Install a windshield, etc. at the place of use. Also note that the bottom corner screw is adjusted to center the bubble of the level indicator. The unbalanced level of the electronic balance is also one of the reasons for the weighing error.