UW CHEMISTRY NMR
Announcments & Equipment Logs
AV500 Log Book
Welcome to the Chemistry NMR Online Log Book – your One Stop portal to communicate about the spectrometer to the Facility Staff in a timely manner.
Please record your comments and relevant observations about AV500 instrument by submitting an entry using the “Post Log Entry” box found below.
Subscribe to AV500 logs
269 Responses to “AV500 Log Book”
« Previous 1 … 4 5 6 7 8 … 27 Next »
I think the 31P is still not pulling the correct values from the prosol table. The power level of the pulse = 120 dB (which is 0? I think?).
Marie, Sam and NMR community:
The prosol table has been restored and the pulse/power combinations are now loading correctly. Also, the default of O1P you see as 2500 is nominally 5.0 ppm in this instrument and this is the default. The receiver gain of 18000 is most probably because the ‘getprosol’ command was setting the power PL1 to the minimum i.e. no NMR signal. Everything checks out ok now. Please post a comment if you see anything amiss.
I think that Marie’s correct in that there’s an error with finding the correct values in a table somewhere.
In the edasp screen, it appears that the SF01 (frequency offset?) is set to 2500 Hz for all of the nuclei. The lock signal is present though, so I’m uncertain what the problem is. rga sets the receiver gain to at least 18000 for proton on an H20/D20 sample (I think this makes sense if the spectrometer offset is just extremely off for the 1H dimension). Anyway – to other users: instrument is probably down for the weekend at this point…
The getprosol commands have been deleted, or are not working. It was not possible to run a proton or carbon spectrum.
the tuning is off and turning the rod as far as it can go still doesn’t bring it back into line
No temp callibration files so don’t know the temp of a VT experiment. Also cannot tune below ~ 0 oC the proton channel.
Can you please enter the command ‘sref’ and see…
entire spectrum is shifted downfield although I locked successfullly on the d6 acetone.
Please run the ‘proton’ macro before you setup your run. This should give you the expected results.
Acquisition not running properly. The FID is not an exponential decay. The acquisition time of the FID is much shorter than it should be. EFP brings a noisy, curved baseline and no peaks. Logging out and back in again has fixed this in the past, but is not fixing it now.