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articles:optimizing_calibration_intervals [2019/03/17 18:21] – [Optimizing Calibration Intervals] rrandall | articles:optimizing_calibration_intervals [2019/03/17 18:33] – [Using the “Staircase” method] rrandall | ||
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Why should you care about optimizing calibration intervals? | Why should you care about optimizing calibration intervals? | ||
- | Most M&TE are on arbitrary 12 month calibration intervals... as if “one size” fits all. These are typically “manufacturer recommended intervals” - which are often extremely conservative because the manufacturer wants their calibration labs to stay busy. And most companies happily pay them to do so. Yes… over-calibrating M&TE reduces risk… but only to a degree((A MUCH better way to reduce risk is to increase the minimum " | + | Most M&TE are on arbitrary 12 month calibration intervals... as if “one size” fits all. These are typically “manufacturer recommended intervals” - which are often extremely conservative because the manufacturer wants their calibration labs to stay busy. And most companies happily pay them to do so. Yes… over-calibrating M&TE reduces risk… but only to a degree((A MUCH better way to reduce risk is to increase the minimum " |
If M&TE calibration intervals were optimized based upon performance, | If M&TE calibration intervals were optimized based upon performance, | ||
- | ===== Methodologies for the determination | + | ===== Methodologies for the Determination |
Methodologies for the determination of calibration intervals are defined in documents such as: | Methodologies for the determination of calibration intervals are defined in documents such as: | ||
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< | < | ||
- | ===== The “Staircase” method ===== | ||
Perhaps the simplest and most widely used methodology for optimizing calibration intervals is the " | Perhaps the simplest and most widely used methodology for optimizing calibration intervals is the " | ||
- | ==== How use it ==== | + | ===== Using the “Staircase” method ===== |
Each time an instrument is calibrated on a routine basis, the subsequent interval is extended IF it is found to be within a certain percentage (e.g., 80%) of the maximum permissible error that is required for measurement, | Each time an instrument is calibrated on a routine basis, the subsequent interval is extended IF it is found to be within a certain percentage (e.g., 80%) of the maximum permissible error that is required for measurement, | ||
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A critical component when using this methodology is determining the percentage of the maximum permissible error. The higher the percentage, the greater the risk of an instrument being found Out-of-Tolerance (OOT); potentially resulting in nonconforming product escapes. The lower the percentage, the greater the cost associated with lowering the risk of an OOT condition; and reducing the potential for nonconforming product escapes. This percentage will often vary based upon the type of instrumentation to which it is applied. \\ | A critical component when using this methodology is determining the percentage of the maximum permissible error. The higher the percentage, the greater the risk of an instrument being found Out-of-Tolerance (OOT); potentially resulting in nonconforming product escapes. The lower the percentage, the greater the cost associated with lowering the risk of an OOT condition; and reducing the potential for nonconforming product escapes. This percentage will often vary based upon the type of instrumentation to which it is applied. \\ | ||
- | Most often companies establish a " | + | Most often companies establish a " |
===== Initial Calibration Intervals ===== | ===== Initial Calibration Intervals ===== | ||