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Calibration Uncertainty statements for Temperature PRT probes state a value for a cretain range, example:
±6.3 mK from -40 to 0 °C
±11.5 mK from 0 to 420 °C
±26 mK from 420 to 600 °C
±43 mK from 600 to 661 °C
(0 °C is set at ice point to ±3 mK)
This is stating that the worst case error for the range is the ±xx mK value. Can it be assumed that the worst case error is at the extreeme of the range?
If so then can the range be plotted out vs uncertainty so at a point along the range the uncertainty from the line slope can be used?
Is this an acceptable practice?
Getting back to my example, if I wanted to find the uncertainty at 155 °C (from 0 to 420 °C) the line slope would be at about 6 mK (from 3 to 11.5 mK).
±6.3 mK from -40 to 0 °C
±11.5 mK from 0 to 420 °C
±26 mK from 420 to 600 °C
±43 mK from 600 to 661 °C
(0 °C is set at ice point to ±3 mK)
This is stating that the worst case error for the range is the ±xx mK value. Can it be assumed that the worst case error is at the extreeme of the range?
If so then can the range be plotted out vs uncertainty so at a point along the range the uncertainty from the line slope can be used?
Is this an acceptable practice?
Getting back to my example, if I wanted to find the uncertainty at 155 °C (from 0 to 420 °C) the line slope would be at about 6 mK (from 3 to 11.5 mK).