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- Runned on holes U1558, U1559 and U1560. Measurement interval = 10 cm.
- Trevor Williams noticed an offset difference between the MS data in WRMSL and STMSL. Zenon Mateo rewied it. It was due to the correction factor applied to the MS loop in the STMSL, it was set to 1.0 but it should be 1.174, this problem affects STMSL measurements in previous expeditions. Correction factor was not corrected until the end of X393, in order to allow the comparisson comparison between X390 and X393 data.
- The GRA source has been left open to allow to do testing after the change of the computers.
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- During several expeditions the PC computer of this instrument has been behaving strangely, sometimes Windows is frozen and it is not possible to access even a folder using Windows Explorer, other times the computer restarts by itself, stopping measurements if the instrument is in the middle of one test. This issues have been reported when they have been detected. The origin of this issues is unknown, they could be caused by a problem in the NGR computer or by a remote program.
- While closing IMS there was a memory problem in LabVIEW (6 July 2022).
Thermal Conductivity (TCON)
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- Probes H11083, H11089, H51033, V10702, V10701, H11060 were tested.Data are saved in T:\IODP_Share\PhysProps Lab\Testing and Calibration Notes\TCON\TCON_X393_PucksTestsProbesTest.xlsx and in Confluence on the Physical Properties Laboratory Notebook.
Section Half Multisensor Logger (SHMSL)
- On the bulb installed on June 13th the integration time increased fast to 0.440, after that it was stable until July 9th, when the light source was changed.
Offset problem was detected in the Color Reflectance data. It was an intermittent problem, related with the correct operation of the halogen light source shutter.
By looking at the Dark Calibration was also possible to see that the shutter was not working properly because all the information was concentrated under higher wavelength values. Light source sn 034990124 was changed and sn 034990296 installed.
Several sections were rescanned re-scanned to have real measurements.
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The origin of the problem could be in the SHMSL setup parameters or in IMS.
Software Issues
- IMS is not reporting properly the length of some of the sections. This happens when the section is close to one of the brackets (aprox, 5 cm).
- Possible cause is the filter applied at the end of the profile. The profile measured by the laser has the correct length before the filter is applied.
- Changing the setup of the laser from Quality to Rate didn't make any change in the behavior.
- Change the laser speed from 5 to 2.5 cm/s, solve the problem but not for the case of sections shorter than aprox. 45 cm.
- Possible cause is the filter applied at the end of the profile. The profile measured by the laser has the correct length before the filter is applied.
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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
- ADD TEST INFO
Shear Strength Station (AVS)
- No issues reported during this expedition.
Moisture and Density (MAD)
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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 randomly.
- 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 clay 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)
- No issues reported during this expedition.
Moisture and Density (MAD)
- Hard rock MAD samples were share with the PMAG laboratory. Samples were weighed and them guven given to the PMAG laboratory to do the measurements, after that they returned to the PP laboratory to do the regular process of saturating them in Sea water and continue with the MAD measurements.
- The samples were heated in the MAD oven inside a shielded box (designed and build by Alex Roth) when they were needed again in the PMAG lab, after the MAD measurements.
- Pycnometer cells were cleaned and calibrated at the end of this expedition.
- No issues reported.
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