Repeatability vs Reproducibility
→ Repeatability and Reproducibility is an important parameter of Measurement System Analysis. This is a very important concept to find out the Gauge R&R study.→ We can easily find the variation of the operator and gauge which helps us to improve our process.
Repeatability:
➨ It is the variation in measurements obtained,⇢ By one appraiser
⇢ with one measurement instrument
⇢ when used several times
⇢ while measuring the identical characteristic
⇢ on the same part
⇢ in the same environmental condition
⇢ repetition over a short period of time
⇢ This is due to an error in gauge
→ An example is mentioned below:
Possible Causes of Poor Repeatability:
→ There is two possible cause are:[1] Equipment:
⇢ Instrument needs maintenance
⇢ or it should be more rigid
[2] People:
⇢ Environmental condition (Lighting, Noise)
⇢ Physical Condition (Eyesight)
Reproducibility:
➨ It is the variation in the average of the measurements made,⇢ By different appraisers
⇢ using the same measuring instrument
⇢ when measuring the identical characteristic
⇢ on the same part
⇢ This is due to operator error
Possible Causes of Poor Reproducibility:
→ Measurement Procedure is not clear→ The operator is not properly trained in using and reading gauges.
→ Operational definitions not established
👉 See Also:
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