校准Criteria for Analytical Balance

称重是任何分析实验室的基本操作。可以在没有现代分析仪器的情况下运行实验室，但不可能在没有称重平衡的情况下进行分析。

称重是制备样品溶液，试剂，滴定剂，沉淀物等的基本要求。结果的准确性主要取决于分析平衡的准确性。Precautions for correct weighing of samplesdiscussed the need for analytical balance calibrationamongst other factors.

校准通过认证的标准重量将为您提供信心。定期校准将保证您的结果的正确性以及您应该采取的预防措施准备样品.

平衡校准验证了遵循常规校准计划的权重读数。在本文中讨论了建议的平衡校准计划。

但在继续前进之前，首先需要了解分析平衡功能以及如果您不进行常规可能会发生什么平衡校准。

让我们从细节开始！

Understanding Analytical Balances

Balances are found at almost every place that requires precise measurements of weights. But it is crucial to understand that not all balances work similarly. That is why an analytical balance is explicitly designed to be used in laboratories.It helps in measuring very small quantities, ones that are in the range of milligrams and sub-milligrams. Typically, it consists of the following parts:

• 一个带门的透明细胞
• Measuring pan inside the enclosure
• Digital display for the weight

The transparent cell here helps keep air and dust particles away from the balance so that it shows accurate measurements of the weight. Further, the digital display makes it easy to read the exact mass of the component. Therefore, these equipment carry little to no chances of inaccurate measurements after proper分析平衡校准.

分析平衡的最重要特征是它可以显示您甚至最轻微的体重变化，而且在毫克的十分之一。它能够这样做，因为与任何其他平衡相比，它对体重改变更敏感。您还可以使用某些配件具有分析平衡来提高其对不同类型任务的效率。

平衡校准的重要性

当我们在十毫克的大部分测量时，精确度成为必备财产。因为这个原因，分析平衡验证变得至关重要。它有助于将结果保持尽可能准确。因此，您不会通过在任何实验室实验中添加错误数量的任何物质，最终不会创造更重要的问题。

您必须记住的一个因素是平衡校准不是一次性任务。一个analytical balance verificationneeds to be done on a regular basis so that all problems that occur to the equipment can get resolved on time. This way, you can receive correct results on every measurement of weight.

Aspects Covered in Analytical Balance Validation

While the process of balance calibration may not be complicated, it still includes checking a number of aspects, such as:

• Performance:绩效检查意味着检查parameters of performance qualification of analytical balances.In short, the equipment has to be checked for overall performance in measuring different weights.
• 漂移：Here, the display of the equipment is checked for any drifts in a specific direction. There can be several reasons for this to happen. However, it has to be resolved on time to avoid any inaccuracies in the results.
• Measurement Uncertainty:Finally, an analytical balance verification is done to examine any uncertainties in the measurement of different masses.

所有这些方面都有助于进行完整的分析平衡检查。因此，您可以确保您的结果精确且正确，您可以依赖于它们。

Now, let’s see how you can go for a regular分析平衡校准.

Self Calibration

自我校准是一个简单的exercise which takes less than a minute and should be done every time before using the balance

按“CAL”键进行自校准。余额将进入自动自校准模式，并显示以下显示：

自校准过度显示后，显示0.000或0.0000或0.00000g。然后准备使用余额。

执行自校准后，使用0.02克的标准重量，0.05克，0.2克，1.0克，10克和20克的标准重量校准平衡，以覆盖当天您可能会表现的平均衡量范围。

Acceptance criteria:The observed weight should be within +/- 0.1% of the value of standard weights.

每周校准

In addition to self calibration eccentricity calibration is carried out.

偏心率是指当放置在平底锅的不同位置时读数的记录差异。中心，顶部，底部，左侧或右侧。

校准所采取的标准重量为0.01克，0.1克，5Gm和50克。

Acceptance criteria:the RSD of eccentricity for observed readings should not exceed 0.6%

每月校准

Monthly calibration needs to be carried out as per weekly calibration schedule but covering a wider range of standard weights:

0.01克，0.02克，0.05 gm，0.10 gm，0.20 gm，0.50 gm，1.00 gm，2.00 gm，5.00 gm，10.00 gm，20 gm，50gm，50gm和100gm。

Acceptance criteria:观察到的重量应在+ / - 实际值的0.1％内

确实，校准会带来宝贵的时间，但每次提供读数的准确性和一致性都是保证，只要您使用并处理所需的护理。