Recently, there are more and more electronic balances due to the improper use of enterprises and farmers who have been repaired by the Metrology Institute of Zhaoyuan City, Shandong Province. In order to improve the accuracy of enterprises and farmers using electronic balances to measure the number of instruments and extend their service life, the Shandong Zhaoyuan Quality Supervision Bureau Metrology Institute introduced the four main points that enterprises and farmers should pay attention to when using electronic balances.
Pay attention to four points when using an electronic balance
One is to warm up in advance. The electronic balance usually needs to be warmed up before use, and the warm-up time of each balance is often different. Generally speaking, the higher the accuracy level of the balance, the longer the warm-up time required, according to the requirements in the balance manual Preheating can be extended if necessary (usually the lower the ambient temperature, the longer the preheating time). In fact, many users are ready to use the balance when they use it. This does not guarantee the measurement performance of the balance. Therefore, warming up the electronic balance is the key to accuracy.
The second is environmental conditions. Environmental conditions are also an important factor affecting the measurement performance of electronic balances. If there is no special temperature limit specified in the operating instructions of the electronic balance, the balance should work normally under the temperature condition of -10 â„ƒ ~ 40 â„ƒ; if a special temperature limit is specified, the balance should work under the specified temperature conditions; electronic The balance also has requirements on the humidity of the environment. For example, the level I balance requires the relative humidity to be no more than 80%.
The third is the horizontal state. Generally, high-precision electronic balances are equipped with level adjustment devices and levelers. During use, the level of the balance must be checked frequently. In fact, some users often neglect to check the horizontal status of the balance (the electronic balance often causes unevenness or unevenness of the four corners due to movement or other reasons). This is also the main reason for the inaccurate balance data.
The fourth is calibration at any time. Some people think that the electronic balance is accurate within the validity period after periodic verification, and often overlooks the importance of calibration, or even does not perform calibration. As everyone knows, due to changes in environmental conditions and human factors, the measurement performance of electronic balances often changes slightly, which requires us to calibrate it in daily use. So, how do we calibrate? The electronic balance should be calibrated every day or before each use. If necessary, the frequency of calibration can be increased. The weight used for calibration is theoretically the higher the grade, the better. Generally, the weight error should be no more than 1/3 of the maximum allowable error of the balance, and should be sent to the quality supervision department for regular inspection. If the error is found to exceed the standard, It should be sent to the quality supervision department for testing in time to avoid loss and harm to consumers. "China Quality News"
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