UW CHEMISTRY NMR
Announcments & Equipment Logs
AV500 Log Book
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Please record your comments and relevant observations about AV500 instrument by submitting an entry using the “Post Log Entry” box found below.
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269 Responses to “AV500 Log Book”
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Consistently getting topshim failed- too many points lost during fit. Across multiple samples in DMSO and CD3CN.
Giving entirely flat 1H spectrum (no peaks just baseline) in MeOD. Likely faulty lock/shimming? Sample looks good on GG500 so not a sample issue.
More on the lock issue: after performing “lock” on solvent, I had to enter “lock on” to actually get it to initialize. Topshim/ scan collection was fine after that in both CD3CN and DMSO-d6.
topshim cannot be completed due to lock failure
“PrepareLock- lock is off: please lock in prior to shimming”
Lock was failed, so topshim cannot be done.
topshim failed repeatedly, sample successfully locked onto CD3CN prior. Topshim error said signal to noise was too low – signal loss for long echo time
After running 2 samples fine, on the 3rd sample no commands worked after injection, I got random errors, and then command input stopped doing anything. Console panel says “BSMS Protocol violation” followed by ” BSMS VME Timeout”. Sample could not be ejected.
Sorry, I meant dummy sample wasn’t coming off when I tried “eject”
NMR sample holder didn’t come off when I tried to eject and put my sample
Not sure whether previous user noticed something weird.
not ejecting. giving repeated spin rate error