Measurement Systems Analysis

In order to successfully conduct design of experiments, it is important to use an adequate system for recording measurements (where a "measurement system" includes the operators who perform the measurements, the measuring device that they used and their method for using the device). Weibull++/ALTA's DOE feature includes three tools for evaluating and comparing measurement systems. You can use these tools to:

Help you determine whether you should use a particular measuring device.
Compare one measuring device to another.
Compare a measuring device's performance before and after a repair.
Investigate the sources of variation in the measurement results (e.g., variation could result from differences in how operators use a measuring device).

The three tools for measurement systems analysis are described next:

The linearity and bias folio is used to estimate a measuring device's accuracy (i.e., the extent to which the device underestimates or overestimates the measured values, across the device's expected operating range).
The gage R&R folio is used to estimate a measurement system's precision (i.e., the variation in measurements that can be expected when the same part is measured repeatedly using the same measuring device).
The gage agreement folio is used to compare the accuracy and precision of two systems.

To add one of these folios to your project, right-click the Test and Planning folder in the current project explorer or choose Insert > Test and Planning then choose the folio type (Linearity and Bias, Gage R&R, or Gage Agreement).

The ReliaWiki resource portal provides more information on measurement systems analysis at: http://www.reliawiki.org/index.php/Measurement_System_Analysis.

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