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- The caliper has still the problem of getting stacked sometimes when the Auto Close button is used for measuring. To unlock it go to MOTION > EXLAR UTILITY and wait until the configuration is downloaded. Click DONE. The Caliper should move again.
- Be careful, when Caliper Calibration Utility opens, row 1 is active by default and the standard measurement will start to change. A new measurement should be done and the row should be deactivated. It would be useful to maintain that first row deactivated when opening the utility.
- It is not possible to scan MAD residue labels on the Gantry if we measure pieces. Do we want that feature?
Tests
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X393 PP scientists, Chiara Amadori and Sarah Widlansky, did several experiments with hard rock sample-cubes in the Caliper in order to determine the behavior of the instrument and the samples:
- Experiment on cubes that were already measured: Measured after a complete MAD analysis.
- Measuring first X axis, then Y axis and then Z axis.
- Measuring X-Y-Z axis intercalate.
- Experiment on fresh cubes: Fresh cubes, not heated previously, saturated during 12 h in seawater. The order of the axis measurement was X, Y, Z.
- Measured after MAD analysis (oven 24 h at 105°C and 3 hours desiccator).
- Measured before MAD analysis (saturated 12 h in seawater).
The conclusion for experiment 1 was that in the 75% of the cases the axis measured first shows a quick and extreme drop of Vp. This could be produce because the samples measured had been heated in the oven 24 hours at 105°C, what altered the clays and made other physical changes, allowing the pressure of the caliper to destroy some structures.
Acrylic standards were also measured, in the first case the measurements were repeated several times in the same axis and in the second case the order of the axis was change during the subsequent measurements. Obtaining a variation of < 0.03 %.
Data could be found in T:\IODP_Share\PhysProps Lab\Testing and Calibration Notes\GANTRY\Hard-rock cubes Test - X393.xlsx and in Confluence on the Physical Properties Laboratory Notebook.
Shear Strength Station (AVS)
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