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Linearity and Stability

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Guest user Created:   Feb 13, 2019 Last commented:   Feb 13, 2019

Linearity and Stability

When to accept instrument, I mean so to say, what is the acceptance criteria of bias. similar issue with Linearity & stability?
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IATF 16949 DOCUMENTATION TOOLKIT

Step-by-step implementation for smaller companies.

IATF 16949 DOCUMENTATION TOOLKIT

Step-by-step implementation for smaller companies.

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Ivan Pribicevic Feb 13, 2019

Answer:
First, based on customer requirements, you should set specification limits (Lower specification limit and Upper specification limit) for measurement mistakes. Based on that you have to show that bias is in specification limits by doing MSA (Measurement system analysis).
Based on Six Sigma methodology for an instrument, we have Machine bias, that is the case when different instrument gets detectably different averages for the same measurements on the same parts.
For the stability, you should compare the measurements at one point of time to measurements taken at another point in time. If there is consistency across time than it is stable.
Linearity exists when accuracy is consistent across the entire range of possible values. So you can draw a diagram with at least 30 measures to see is linearity achieved.
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Feb 13, 2019

Feb 13, 2019