Measurement FundamentalsMeasurement Errors
What are Measurement Errors?
At some point, differences in measurement results (measured values) will arise due to some factor. These differences are referred to as measurement errors. Measurement errors can be caused by a variety of factors, and countermeasures will need to be taken accordingly. When a measurement error occurs, it is important to examine the cause of the measurement error thoroughly before implementing any countermeasure. This is important for ensuring stable product quality.
Measurement Error Causes
Measurement errors can be broken up into three general categories.
|Type of error||Cause of error|
|Errors caused by the measurement system||
|Errors caused by the user||
|Errors caused by environmental conditions||
Errors caused by the measurement system or environmental conditions can be eliminated by confirming the cause and implementing the appropriate countermeasures. Errors caused by the user may call for medium- to long-term countermeasures such as reevaluation of the measurement process and employee training.
Eliminating Measurement Errors
Measurement errors can be eliminated for objects that will be measured multiple times. However, it is unrealistic to think that countermeasures can be implemented in the inspection process. To obtain higher accuracy for any given measurement, it is necessary to implement countermeasures according to the cause of the Measurement error.
|Eliminating intrinsic measurement system errors||
|Change judgement criteria||Narrow the tolerance range for a stricter acceptable judgement range|
|Create a system that can compensate for individual differences||