UW CHEMISTRY NMR
Announcments & Equipment Logs
Hardware
PERSISTENT TOPSHIM PROBLEMS – BRIEFLY EXPLAINED…
Dear Users While AV301 instrument has been offline for almost four weeks, you might have also noticed that people complain about Topshim failure on AV500 and AV300. AV301 was taken down to address two complex problems, one is the failure of Topshim with 2H based solvents (i.e. most of the samples used) and a hardware […]
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UPDATE ON AV500 AND GG500
Dear Users : AV500 : We have swapped in the triple resonance TBI-1H {13C,X} probehead. Please take a moment to look at the Summary sheet that is displayed on the console box behind the computer. Please get in touch with one of the facility staff if you have any questions. This probe can perform Topshim […]
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PREPARING FOR 500 MHz INSTRUMENT UPGRADES
Dear Users Recently, some of you might have seen a Post in this space about oncoming instrument Upgrades in the 500 MHz category. Here is a link to that roadmap, in case you missed it. To summarize : Beginning of the New Year 2023 We will be left with two modern 500 MHz spectrometers : […]
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ALERT ! AV301 : SYSTEM WILL BE OUT OF ACTION…FOR A DAY OR SO
Dear Users I have been receiving sporadic complaints that the Locking operation is not reliable as well as Topshim is giving ‘iffy’ results. I briefly looked at the issue this morning and I am also not very happy at the shim results. Since there are a few moving parts to this subtle problem (the failure […]
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AV500 : TEMPORARY SAMPLE HANDLING GLITCH RESOLVED…
System back to normal. Lock system and other vitals are normal. NMR Facility Manager 10/21/22
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UPDATE ! AV300 – SYSTEM BACK IN ACTION…WITH THE ATMA PROBE !
Dear Users Despite my ominous message earlier about putting a backup probe in place with manual operations, I am glad to report that we managed to fix not only the ATMA probe in-house but also the original issue in the console electronics, which drove this venerable Probehead crazy. I have released the instrument for regular […]
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ALERT ! AV300 – SYSTEM DOWN DUE TO PROBE ISSUES
The ATMA Probe is repeatedly failing in both tuning/matching and gradient shimming parts. Though we will first attempt to find an in-house remedy for the above, the chances are slim that it will be successful, given the history of this probe. We will do what we can to provide a backup probe in the system, […]
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GG500 : UPDATE ON LOCKING – INCONSISTENCIES ADDRESSED
Dear Users Thank you for those of you who brought the following intermittent issue to my attention : Locking fails sporadically, but mostly on solvents with a weak lock signal, such as CDCl3. The autolock failure has been observed, sometimes after Topshim completes and at other times, even during initial locking attempts. The good news […]
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AV500 : IMPORTANCE OF TOUCHING UP THE X,Y SHIMS
Dear Users Way back, I had highlighted the importance of touching up the so-called transverse shims a.k.a. X and Y shims, AFTER you have completed the Topshim command. I had shown a real-life example of the difference this simple step makes in getting a well resolved and great spectrum. Here is a link to that post […]
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AV301 : SYSTEM READY FOR USE WITH SURROGATE BBI PROBE
Dear Users The regular probe with a faulty ATMA motor assembly is pulled out for repairs. Do not underestimate the probe that is placed in the magnet as a backup, because it is called Surrogate. This is a newly procured “gently used probe” in excellent condition and gives beautiful spectra as I show below. […]
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