3. Measuring control charts

Control by measurement concerns all measurable values. Its implementation requires knowledge of the standard deviation σ either historically, or by carrying out a minimum of 30 measurements. This type of chart can be used for a variety of purposes:

monitoring of measuring equipment using control standards (balance, HPLC);
process monitoring based on sample measurements (tablet mass, filling volume, temperature).

Please note

In the second case (process monitoring), it is essential to ensure that the measurement uncertainty of the process used to monitor the process has an uncertainty compatible with the dispersion of the process. The automotive industry uses an experimental technique to ensure this compatibility (MSA R&R Study)....

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Measuring control charts