Hi Piotr,
I'm not sure what others have suggested, but one cause I've seen for this is
if there are gnarly vibrations in the spectrum. Do you have a lines
hape standard? If so, put that in and run a normal experiment using
the PROHUMP parameter set--are there gnarly vibrations in the baseline?
This has been caused in the past by either floor vibrations or by a nitrogen
check valve vibrating around 60 Hz. If you see large floor vibrations,
please confirm that your magnet stand is adjusted properly--that when the
stand inflates that all 3 legs actually do raise up.
Over time, there are foam pads on the adjustment posts for the legs that compress
and the stand doesn't go up as much as it used to.
Cheers,Mike
On Wednesday, April 29, 2026 at 11:54:10 AM MDT, Piotr Dobrowolski via groups.io wrote:
700 MHz Avance NEO / Topspin 4.5.0
Autocalibration keeps failing showing the following error: "shim suppression -
experiment failed". What does it mean and how to fix it?
Topshim works OK. I can run 3D grad shimming on the auto-calibrate sample without
any errors.
So far Bruker tech support have not been able to help me.
Thank you.
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