Standard Thermal Line Laboratory Printer

余额通常被视为实验室的工作人员，但实际上它们实际上是极其精确和敏感的测量仪器。必须理解并正确理解并处理复杂的组件以避免不准确的读数。

Below we discuss a number of factors that affect the accuracy of analytical balances.

校准

第一个问题是显而易见的，因为它被忽视：校准对于您的数据的完整性至关重要。正在进行的维修和校准计划，随之而不发生仪器的寿命，确保测量的准确性，可靠性和可重复性。

第一个问题是显而易见的，因为它被忽视：校准对于您的数据的完整性至关重要。正在进行的维修和校准计划，随之而不发生仪器的寿命，确保测量的准确性，可靠性和可重复性。

Even though some balances have an internal calibration feature, many labs conduct their own calibration tests on new equipment with certified calibration weights that help users to determine the calibration settings for their specific lab environment. Calibration is often performed annually, but users should consider more frequent testing if balances are used heavily and/or in an environment subject to vibration or frequent temperature or humidity fluctuation. Maintain a log of calibration dates and procedures, including reference to NIST-traceable weights or other equipment.

潮流

空气电流可以影响分析平衡的复杂机制，就像温度和振动一样可以改变小样本尺寸的测量。来自吊扇，空调和开放门的气压的变化可以损害测量精度。为了对抗气流对实验室余额的影响，使用平衡罩或平衡外壳内的分析余额（“死气”盒）。这些外壳还用于保护操作员免受称重的有毒或有毒化学品。

温度

室温丝毫的变化会导致样品重量的显着变化，因此严格的温度控制有助于确保对分析平衡的准确读数。如果室温过高，则样品可以扩大或失去由于蒸发而丢失的一些水分。如果温度过低，样品可以合同，或者水可能会在样品的容器中凝结。这两个因素都会影响测量精度。

振动

振动from refrigerators, ventilation systems, and other equipment also compromises measurement accuracy. Since the sample size is typically quite small, the slightest vibration can rearrange, displace, or spill the sample, thereby affecting the amount of material available for measuring as well as its distribution in the balance. Small vibrations can also disrupt the delicate machinery of the analytical balance, necessitating recalibration of the analytical balance.

Consider the following recommendations to ensure the most accurate and reproducible results achieved by your analytical balance:

• 始终检查以确保余额是级别。
• 在称重之前关闭平衡门或将平衡放在“死气”外壳内
• 在称重之前将热或冷样品平衡到室温下的室温。
• Protect hygroscopic samples from moisture until just prior to weighing.
• 将分析余额放在保护的环境中远离极端的温度极端，例如阳光直射，加热和交流通风口。
• 避免在称重区域引起振动的繁忙
• 避免过载，这可能会对机械部件造成损坏。当使用微量矛盾时，这尤其重要