Variation in Measurement system

What is the Variation in Measurement System?

1) What is the Variation in Measurement System?

→ Variation is sometimes described as spread or dispersion to distinguish it from systematic trends or differences.
→ Measures of variation are either properties of a probability distribution or sample estimates of them.
→ The range of a sample is the difference between the largest and smallest value.
→ The observed variation in process output measurements is not simply the variation in the process itself, but it is the variation in the process plus the variation in the measurement that results from an inadequate measurement system.

Variation in Measurement system

➤ Measurement System Variation :

Variation in Measurement system

→ Classification of Variation Related to Measurement System:
→ There are different sources of variation available in the measurement system.



➤ The observed process variation is divided into two main parts,

     (1) The actual process variation and 
     (2) The measurement variation.


     (1) The actual variation is due to below parameter in the system

           e.g. Cycle time
                  Dimension data
                  Number of defects
                  Some other factor




     (2) The measurement variation further divided into two parts

          (A) Variation related to Precision (related to variability)
          (B) Variation related to Accuracy (related to central location)

          (A) Variation related to Precision is divided into 3 parts

                (a) Resolution
                (b) Repeatability
                (c) Reproducibility

          (B) Variation related to Accuracy is divided into 3 parts

                (a) Linearity
                (b) Bias
                (c) Stability

→ Both variations have a common factor which is the variation within a sample.

➤ The classification of the observed variation is mentioned below:

Variation in Measurement system

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