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Using SPRT Calibration Certificates

Technical Guide 21

Standard platinum resistance thermometer (SPRT) calibration certificates typically report measurements as resistance ratios with respect to the SPRT resistance at the triple point of water and give the uncertainties in these measured resistance ratios. This guide explains how to use the certificate with the SPRT to measure temperature, and how to calculate the uncertainty in the measured temperature caused by the calibration uncertainties.

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