Hi Jim,
I would repeat the Ed suggestion. It is indeed a probe-dependent, but 244 looks
too high a number for 1H tuning, so the .bb file was likely overwritten with
the wrong number. In whichever case, after correction of .bb file (if
it was done correctly for the correct NMR probe), you should see a different
number in your ATMA error, like
"Can't move to position 21 , current -3" . If it continues to complain
about 244, restart Topspin one more time. Indeed, it's good to swap PICs because
the ATMA probe reinitialization will be done again afterward.
Regarding the .bb file, other solvents may have a correct value, so you may try
to change a solvent simply by starting lock on another solvent.
If a similar problem occurs with the correct .bb file, the ATMA system will
have to be repaired. The simplest would be to check if the motor has
not got stuck in one of the limit positions (a rare reason, but you mentioned 19F).
Over the last three years, > 10 of our customers have asked us to fix that
error-related fault, so it is relatively common for the 2nd generation of ATMA probes...
Regards,
Dr. Pavel Iouchmanov,
--
Repair/upgrade of NMR probes and NMR spectrometers
Electrophoretic NMR and custom NMR solution for electrochemistry
--
+46736220672
P&L Scientific AB
Applied Physical Chemistry, KTH
Teknikringen 36,
100 44 Stockholm
Sweden
pavel_at_plscientific.se
http://www.plscientific.se
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Received on Fri Oct 03 2025 - 03:48:38 MST