What is the most effective way to calibrate a balance?

1 Why calibrate a balance?

Calibration is the process of comparing the output of a balance with a reference value that has a known uncertainty. Calibration helps to establish the traceability of the measurement results, which means that they can be linked to a common standard. Traceability is important for quality assurance, regulatory compliance, and scientific integrity. Calibration also helps to identify and correct any sources of error or bias in the balance, such as drift, repeatability, linearity, or eccentricity.

2 When to calibrate a balance?

The frequency of calibration depends on several factors, such as the type and usage of the balance, the environmental conditions, the tolerance requirements, and the manufacturer's recommendations. Generally, the more sensitive and precise the balance is, the more often it needs calibration. Some balances have internal calibration functions that can be activated automatically or manually at regular intervals. However, external calibration with certified weights is still recommended at least once a year or whenever there is a significant change in the location, temperature, or power supply of the balance.

3 How to calibrate a balance?

Calibrating a balance may differ depending on the model and features, but generally, it should be checked for level and stability, and any debris should be removed from the weighing pan and the area around it. After turning it on and allowing it to warm up for at least 30 minutes or as instructed by the manufacturer, select the calibration mode. Place an appropriate calibration weight on the center of the pan that matches the capacity and resolution of the balance with a known mass and uncertainty. Wait for the balance to register the weight and perform the calibration before removing it and turning off the mode. This process should be repeated with different weights covering the entire range of the balance, such as 10 g, 50 g, 100 g, and 200 g for a balance with a capacity of 200 g and resolution of 0.01 g. Record the results and compare them with reference values; if they are within acceptable limits, then the balance is ready to use. Otherwise, contact a qualified service provider for maintenance or repair.

6 Here’s what else to consider

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