电子天平日常校准最大允许误差是多少？

如何校准天平

爱伦坡(一桶白葡萄酒)中“凡伤我者，必遭惩罚”英文原著中是如何写的？

Electronic balance verification regulations

1. Precision and accuracy

The electronic balance shall meet the specified precision and accuracy requirements, which are determined according to the accuracy grade and application range of the balance. The accuracy grade of the balance is usually indicated by the decimal place of the displayed weight. The higher the decimal place, the higher the accuracy of the balance.

2. Operating specifications

The electronic balance shall be installed in a stable position, and the surrounding environment shall be kept clean and dry to avoid air drafts and vibrations. The balance should be turned on for 5-10 minutes before use to allow the internal components to stabilize. The balance should be used in a low-temperature environment, and if necessary, it should be heated to avoid condensation.

3. Measurement standards

The electronic balance uses a weight as a measurement standard to ensure that the weight is accurate and reliable. The weight is usually made of high-quality material and has a high stability and long service life. The weight should be regularly calibrated to ensure its accuracy.

4. Error analysis

The error of the electronic balance mainly comes from the deviation of the weighing result from the true value. The error may be caused by the influence of external environment, such as temperature, humidity, air drafts and vibrations. In addition, the error may also be caused by the aging of the internal components of the balance, such as strain gauges and amplifiers. Therefore, it is necessary to regularly calibrate and inspect the balance to ensure its accuracy and reliability.

5. Verification methods and procedures

The verification methods and procedures of the electronic balance refer to the national verification standards and operating procedures. The specific steps are as follows: (1) confirm that the balance is in the stable state; (2) compare the weighing results of the balance with the standard weight under the same conditions; (3) calculate the deviation of the weighing results; (4) determine whether the deviation meets the accuracy requirements; (5) record and analyze the verification results; (6) make decisions on whether to accept or reject the balance; (7) implement the corresponding corrective measures if necessary; (8) check whether there are any hidden dangers after repair.

6. Verification cycle and requirements

The electronic balance shall be regularly verified in accordance with the verification cycle and requirements stipulated by the national verification standard. The specific verification cycle depends on the accuracy grade and application range of the balance. The requirements for each verification item shall be strictly observed to ensure that the balance meets the specified accuracy and reliability requirements. If any item fails to meet the requirements, it shall be repaired or replaced in time to ensure that it meets the specified performance indicators before it can be put back into use.

电子天平日常校准最大允许误差是多少？

最大秤量为3kg的电子秤（分度值e=1g） 20g ＜ m ≤0.5kg

其最大允许误差±0.5g o.5kg＜ m ≤2kg

其最大允许误差±1g m＞2kg

其最大允许误差±1.5g

最大秤量为6kg的电子秤（分度值e=2g） 40g＜ m ≤1kg

其最大允许误差±1g 1kg＜ m ≤4kg 其最大允许误差±。

在计量检定中若各项参数指标的最大示值误差均不大于1d，我们确定e=d；如果各项参数指标最大示值误差均小于10d，我们确定e=l0d。

有时还需根据具体情况而定，比如当d：0．2mg时，e=5D；d：0．5mg时，e=2d。

总之，在对检定标尺分度值的划分上应按照以下形式：1×10k或2×10k或5×10k，k为正整数、负整数或零）。

扩展资料：

例如:测量范围为0～25mm，分度值为0.01mm的千分尺其示值的最大允许误差0级不得超过±2μm；1级不得超过±4μm。

又如测量范围为25℃～50℃的分度值为0.05℃的一等标准水银温度计，其示值的最大允许误差为±0.10℃。

如准确度等级为1.0级的配热电阻测温用动圈式测量仪表，其测量范围为0～500℃，则其示值的最大允许误差为500×1%=±5℃，则用引用误差表述。

如非连续累计自动衡器(料斗秤)在物料试验中，对自动称量误差的评定则以累计载荷质量的百分比相对误差进行计算，准确度为0.2级、0.5级的则首次检定其自动称量误差不得超过累计载荷质量的±0.10%和±0.25%。

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参考资料来源：百度百科-最大允许误差

如何校准天平

天平在使用前都必须先校准，后称重。

但天平校准时必须保障及满足以上的基本要素，天平校准功能的有内部校准和外部校准两种，所谓内校是天平机械内安装了砝码称之为自动内校天平。

外校属于人工外部使用砝码操作校准。

两种校准方式虽不同。

但操作的规则是一样的。

天平的校准是: 只要天平断电、停电、转移或长时间使用都要进行校准。

需要使用人员规范掌握，正确操作。

有的使用人员认为天平每年度计量检定部门进行检定，合格有效期内天平就是合格的，天平就是准确的，在检测天平时，遇到外校的根本没有自校砝码。

其实不然，计量检定部门按照《电子天平》检定规程要求使用标准砝码对电子天平的计量性能进行评判，天平的计量性能是否稳定，符合使用要求，并出具合格证书，但日常电子天平的准确性需要使用人员进行校准。

两者不可相互替代。

扩展资料：

使用注意

1、事先把游码移至零刻度线，并调节平衡螺母，调节平衡螺母时最好用镊子，使天平左右平衡。

2、右放砝码，左放物体。

3、砝码不能用手拿，要用镊子夹取。

在使用天平时游码也不能用手移动。

4、过冷过热的物体不可放在天平上称量。

应先在干燥器内放置至室温后再称。

5、加砝码应该从大到小，可以节省时间。

6、在称量过程中，不可再碰平衡螺母。

参考资料来源：搜狗百科-天平

爱伦坡(一桶白葡萄酒)中“凡伤我者，必遭惩罚”英文原著中是如何写的？

Nemo me impune lacessit. 反伤我者，必遭惩罚。

下面是这句话前后的一小段文字。

希望能帮到你！

'A huge human foot d'or, in a field azure; the foot crushes a serpent rampant whose fangs are imbedded in the heel.'

'And the motto?'

'Nemo me impune lacessit.'

'Good!' he said.

'The wine sparkled in his eyes and the bells jingled. My own fancy grew warm with the Medoc. We had passed through long walls of piled skeletons, with casks and puncheons intermingling, into the inmost recesses of the catacombs. I paused again, and this time I made bold to seize Fortunato by an arm above the elbow.