Practical sheet | REF: FIC1483 V1

Statistical monitoring of a batch of measuring instruments: inter-instrument comparison

Author: Pascal COQUET

Publication date: March 10, 2015 | Lire en français

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5. Interpret and conclude

The test series is now complete. You can already conclude that the remaining instruments are statistically identical. The connection is therefore not in immediate jeopardy.

All that remains is to interpret the exclusions: look for all possible causes before concluding that an anomaly has occurred. If nothing explains the exclusion, and depending on the type of anomaly diagnosed, plan a calibration (in case of drift) or maintenance (in case of failure). In our example, the M002 scale has drifted, requiring calibration. As for the M006, there is no cause to explain its high variability, so we deduce that its performance has deteriorated. What's more, as the EN test detected it at 100 g, it seems prudent to send it for calibration too.

Although this is not the subject of this data sheet, it is possible to go further with regard to instruments...

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