nmr_probes
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nmr_probes [2023/10/24 08:22] noji wish is now wish8.6 |
nmr_probes [2024/01/29 10:51] (current) swartzj [Error message: "/srv/s3/nmr-logs/spectrograph.log is not accessible"] |
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| ===== Description ===== | ===== Description ===== | ||
| - | The NMR running programs for both the S800 analysis line and spectrograph dipoles can be started by logging in to exp-s3-nmr.ftc (10.40.230.111) accessible from the EXP network, namely, from a whatever | + | The NMR running programs for both the S800 analysis line and spectrograph dipoles can be started by logging in to exp-s3-nmr.ftc (10.40.230.111) accessible from the EXP network, namely, from any computer connected to the EXP network, |
| $ ssh [your-user-name-on-EXP]@exp-s3-nmr -Y | $ ssh [your-user-name-on-EXP]@exp-s3-nmr -Y | ||
| Line 111: | Line 111: | ||
| * Simply turn it off, wait few seconds, and turn it back on | * Simply turn it off, wait few seconds, and turn it back on | ||
| + | ==== Error message: "/ | ||
| + | |||
| + | * In a new terminal, ssh to yourname@exp-s3-nmr, | ||
| + | * mv spectrograph.log spectrograph-yourname.log | ||
| + | * Now close the error message window and you should not have this problem anymore. | ||
| + | |||
| + | ==== NMR reading sometimes takes too long (> 30 min) ==== | ||
| + | |||
| + | This is typically caused by one of two possible factors: | ||
| + | |||
| + | 1. The signal is weak, and so the NMR " | ||
| + | * This can be alleviated by changing the NMR thresholds (it can be done for each magnet in the analysis line, or for both magnets in the spectrograph). | ||
| + | * Stop NMR; enter new threshold (in Volts) and click “Set”; start NMR. | ||
| + | * In general, a threshold 0.15 mV is good for normal NMR signals, whereas 0.10 mV may be necessary if the signals are too weak. | ||
| + | |||
| + | 2. Initial field where NMR starts scanning is far away from actual value (this has only been seen with Spectrograph) | ||
| + | * Check what field is NMR scanning and compare with field read by neighboring NMR. | ||
| + | * If it is too far, stop NMR; enter field (in T) and click “Set”; start NMR. | ||
| - | ==== Spectrograph NMR GUI " | ||
| - | * This is typically the case when the thresholds in the NMR GUI are not set properly. If they are too low, the program may lock in noise. Conversely, if the thresholds are too high, it may miss a weak resonance. | ||
| - | * Threshold for the Spectrograph resonance can be adjusted by hand in the Spectrograph NMR GUI. In general, a threshold 0.15 mV is good for normal NMR signals, whereas 0.10 mV may be necessary if the signal are too weak. | ||
nmr_probes.1698150137.txt.gz · Last modified: 2023/10/24 08:22 by noji
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