Detailed Discussion on the Device Error in the Calibration of Set Weights
2023-06-05
The calibration of set weights is an important instrument for measurement, with relatively high requirements for accuracy. However, due to the susceptibility to environmental influences during the calibration process, there are also various error issues in weight calibration, which can directly affect the accuracy of quality measurement results. For this reason, the editor came to a professional weight manufacturer and had a detailed communication with their technical personnel. The editor will only focus on describing in this article.
1. Accidental error
Accidental error refers to errors that are uncertain and have no rules to follow. The occurrence of such errors has strong randomness and is difficult to avoid in advance. For example, during the calibration of standard weights, if there are impurities on the scale (pointer) of the balance, the movement of the scale (pointer) will be hindered by friction when displaying the measurement results, resulting in varying degrees of error; At the same time, the movement of the scale in weight verification is affected by inertia and fluctuates to a certain extent. Therefore, it is usually necessary to wait for the scale to stabilize before observing the values. If the experimenter reads too early, it is also likely to cause accidental errors.
2. System error
System error refers to the error that varies according to a certain pattern, and most of this type of error comes from the balance itself or experimental personnel, which also has a significant impact on weight calibration. For example, the weight itself has different nominal values based on its mass, but if there is a problem during the production process of the weight that causes the weight's mass to not match the nominal value, there will be a systematic error during weight verification; In the process of weight verification, although many instruments and equipment can be used to improve the accuracy of verification, many operations still rely on human visual and other sensory aspects to complete. In the case of differences in sensory perception among different experimental personnel, it is also easy to cause system errors due to operational differences [2]. In addition, due to the influence of air buoyancy on the gravity of an object, if the object is too light or the accuracy requirements for mass measurement are too high, then there may still be systematic errors in weight calibration due to air buoyancy.
1. Accidental error
Accidental error refers to errors that are uncertain and have no rules to follow. The occurrence of such errors has strong randomness and is difficult to avoid in advance. For example, during the calibration of standard weights, if there are impurities on the scale (pointer) of the balance, the movement of the scale (pointer) will be hindered by friction when displaying the measurement results, resulting in varying degrees of error; At the same time, the movement of the scale in weight verification is affected by inertia and fluctuates to a certain extent. Therefore, it is usually necessary to wait for the scale to stabilize before observing the values. If the experimenter reads too early, it is also likely to cause accidental errors.
2. System error
System error refers to the error that varies according to a certain pattern, and most of this type of error comes from the balance itself or experimental personnel, which also has a significant impact on weight calibration. For example, the weight itself has different nominal values based on its mass, but if there is a problem during the production process of the weight that causes the weight's mass to not match the nominal value, there will be a systematic error during weight verification; In the process of weight verification, although many instruments and equipment can be used to improve the accuracy of verification, many operations still rely on human visual and other sensory aspects to complete. In the case of differences in sensory perception among different experimental personnel, it is also easy to cause system errors due to operational differences [2]. In addition, due to the influence of air buoyancy on the gravity of an object, if the object is too light or the accuracy requirements for mass measurement are too high, then there may still be systematic errors in weight calibration due to air buoyancy.
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