Hi all,
An instrument has me stumped with an odd symptom.
Automated shimming with topshim is taking an abnormally long time to complete.
It always finishes without any errors, and spectra look fine, but the extended
duration may cause us to alter our reservation rules if we can’t find a
fix. It’s affecting all research groups, and the only observed pattern
so far is an apparent solvent dependence. For example, D2 O is fast ~30s and CDCl 3
is slow, frequently over 10 minutes. So far we’ve lowered the 2H pulse
power in the prosol table and didn’t notice any difference. Checked gradients
(attached), and while surprising the differences don’t match trends with
our solvent tests. Haven’t noticed anything off putting in lock phase or field.
The shim file is updated weekly after nitrogen fills with lineshape and sensitivity
samples, during which I haven’t noticed any anomalies while using topshim gui.
The trouble came after recent hardware changes, so I’m hoping it’s due to a
setting/calibration but am not sure where to look.
For context: We had 300 and 400 MHz magnets with AVANCE microbay and AVANCE III
nanobay respectively. A new 400 MHz magnet and console will be installed next month.
We converted the AVANCE III nanobay from 400 MHz to 300 MHz. The AVANCE microbay
retired a few months ahead of schedule when its PSU failed. The AVANCE III nanobay
now has the old preamps from the AVANCE microbay, and a new lock transceiver board.
We brought the shim stack along with the console when moving to the lower field magnet.
We have a BCU 05 setup but the room temp bbo probe doesn’t have working temp
control, probably for some years. So it’s mostly old equipment stitched together
into a new combination. TopSpin 3.6.5
Does this dilemma sound familiar to anyone?
Kind regards,
Luke
Luke Fulton, PhD CHEM BLDG R003
NMR Core Facility Director
Unit 3060
COR 2 E & Department of Chemistry
5 N Eagleville Road
University of Connecticut Storrs, CT 06279
email: fko24003_at_uconn.edu
(alias): luke.fulton_at_uconn.edu
mobile: (603) 953-5275
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#1625): https://urldefense.com/v3/__https://ammrl.groups=
.io/g/main/message/1625__;!!PvDODwlR4mBZyAb0!U6GgGur46BQXmdsByH4k4gTfHV-0eo=
uMapKz4atultPo7xJ4hUfLfjFJZ9vX-e6_Id3xjJbFby-pTzq4zw$
Mute This Topic: https://urldefense.com/v3/__https://groups.io/mt/108563652=
/7559972__;!!PvDODwlR4mBZyAb0!U6GgGur46BQXmdsByH4k4gTfHV-0eouMapKz4atultPo7=
xJ4hUfLfjFJZ9vX-e6_Id3xjJbFby9eeZfJVQ$
Mute #bruker:
https://urldefense.com/v3/__https://ammrl.groups.io/g/main/mut=
ehashtag/bruker__;!!PvDODwlR4mBZyAb0!U6GgGur46BQXmdsByH4k4gTfHV-0eouMapKz4a=
tultPo7xJ4hUfLfjFJZ9vX-e6_Id3xjJbFby8_TGj_DQ$
Mute #nmr_aquisition_software:
https://urldefense.com/v3/__https://ammrl.gro=
ups.io/g/main/mutehashtag/nmr_aquisition_software__;!!PvDODwlR4mBZyAb0!U6Gg=
Gur46BQXmdsByH4k4gTfHV-0eouMapKz4atultPo7xJ4hUfLfjFJZ9vX-e6_Id3xjJbFby9lr25=
Qmw$
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Fri Sep 20 2024 - 10:31:24 MST