nmr_probes
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nmr_probes [2024/01/10 17:36] swartzj [Spectrograph NMR GUI "locks" in noise or does not see weak resonance] |
nmr_probes [2024/06/01 16:35] (current) swartzj |
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| ====== NMR Control ===== | ====== NMR Control ===== | ||
| - | Two digital oscilloscopes are dedicated to NMR readout – one for the analysis line NMRs and one for the spectrograph NMRs. The scopes are located in the S3 mezzanine. They are isolated from clean ground because | + | Two digital oscilloscopes are dedicated to NMR readout – one for the analysis line NMRs and one for the spectrograph NMRs. The scopes are located in the S3 mezzanine. They are isolated from clean ground because |
| ===== Motivation ===== | ===== Motivation ===== | ||
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| * 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) ==== | ==== NMR reading sometimes takes too long (> 30 min) ==== | ||
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| * 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). | * 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. | * 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 signal | + | * In general, a threshold 0.15 mV is good for normal NMR signals, whereas 0.10 mV may be necessary if the signals |
| 2. Initial field where NMR starts scanning is far away from actual value (this has only been seen with Spectrograph) | 2. Initial field where NMR starts scanning is far away from actual value (this has only been seen with Spectrograph) | ||
nmr_probes.1704926196.txt.gz · Last modified: 2024/01/10 17:36 by swartzj
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