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In our lab, we use the replicate of internal quality control sample to build a control chart. The control chart include all analyst, different days, different times.
Our uncertainty calculation is based on control chart limits, because once you build the chart, you had all the variation from all measured including equipment uncertainty in that chart.
Now some auditor argues that this is not enough, and we should use the control chart as a indicator to repeatability and then add the uncertainty from equipment calibration certificates to build the uncertainty budget?
Is he right? Or am I right?
Our uncertainty calculation is based on control chart limits, because once you build the chart, you had all the variation from all measured including equipment uncertainty in that chart.
Now some auditor argues that this is not enough, and we should use the control chart as a indicator to repeatability and then add the uncertainty from equipment calibration certificates to build the uncertainty budget?
Is he right? Or am I right?