CONSISTENCY CHECKS

MSG LOCAL-E MEASUREMENT CONSISTENCY CHECK

The Consistency check is useful in detecting mechanical problems in individual grading lines and also can be used to illustrate the effect of poorly machined production stock on the accuracy of local-E measurements. It requires the passing of hundreds of sticks before a reliable result is available so it can only be used after production has commenced.

To determine the Consistency value at each measurement point the dynamic local-E is averaged at those points. The number of sticks used for the check is usually about 200 to 500 sticks.

The Consistency result for each point is shown on a chart so that the results can be easily interpreted. An overall consistency value is also determined. This is calculated as the maximum deviation of an individual average value from the averages for the whole group. The Figure below shows the typical type of chart produced by the analysis. This chart only shows points with the required number of representative points (eg 200).

The consistency check can be set to be repeated on a continuous basis during production. The continuous consistency check is recommended as it provides the data required to detect if problems occurr during a production run and not just at the commencement of the run.

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