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Figure F10. Example plots of typical temperature logger calibration results. For all panels, x-axis shows stable calibration bath temperatures, as determined with an NIST-traceable probe, and y-axis shows residual temperature errors. A. Calibration for Onset probe. This instrument uses a 12-bit A/D converter and has digital resolution on the order of 0.02°–0.1°C, but repeated measurement at a stable temperature gives greater effective resolution. Calibration in 2009 improved upon factory calibration by removing a systematic offset of 0.04°–0.08°C. B. Calibration of Antares probe purchased in 2004, deployed in an Expedition 301 CORK, recovered and refurbished by manufacturer. This probe was recalibrated in 2009, correcting for systematic offset and slope and improving accuracy to ±0.001°C. Antares probes purchased for CORK deployment in 2004 had a temperature range of ~41°–100°C and a digital resolution of 0.001°C. C. Antares tools purchased in 2009 had a full range of ~1°–100°C and resolution and accuracy on the order of 0.001°–0.002°C. Once again, calibration in 2009 corrected for offset and slope.

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