Dear Spinners
I think I did not make the rationale of my question clearer.
The reason I compared the AV-II/Topspin 3.2 system with the modern NEO
system for the same operation is this. The older system, turns off
rotation before attempting transverse shimming. Stating what we all know,
without this step, changing the XY plane shim currents doesn't register anything
observable either on the LOCK or the FID area.
My point is that, perhaps, in the newer hardware/software combination, this
step is missing i.e. could be a bug of sorts. Turning off the rotation as a
necessary step before transverse shimming, is what I wanted to highlight.
I wanted to see if this is a universal behavior for the NEO systems, if one
were to claim this to be a bug. If not, I will have to look if this
is something that is troubling only my NEO console.
Speaking of sample rotation, in very old systems like the D series (and in
AV-I driven by TS2.1 also), when we attempt 'wobb' while the sample is
rotating, the wobb curve dances around due to modulation from the spinning.
One has to turn off rotation manually before tuning the probe. If
I am not mistaken, TS3.X onwards, the rotation is automatically turned
OFF when wobb or atma is started and the rotation resumes once these routines are complete.
Thank you
Rajan
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Received on Thu Jun 05 2025 - 10:21:38 MST