Hi,
If you are using a standard pulse sequence containing the commands BLKGRAD
and UNBLKGRAD then that is probably the cause of the problem. These
commands are (un)blanking the gradient output AND (de)activating lock hold -
but when the lock hold is turned off the system will try to lock regardless
of what the situation was before you started your experiment!
Simply create a pulse sequence using the commands BLKGRAMP and UNBLKGRAMP -
these only perform the blanking and leave the lock alone (you still need to
remember to turn lock and sweep off before you start!)
Hope that helps - if not please let me know!
Best wishes,
Andrew Gibbs
Bruker BioSpin Limited
> We are interested in doing NMR diffusion measurements on an
> AMX spectrometer
> in non-deuterated solvents, and without any clever deuterated
> solvent in a
> filament or capillary. Obviously, we need to turn-off the
> lock; the field
> will be sufficiently stable for our purposes. We can (using the BSMS
> controls) turn off both the lock and the sweep. However, during the
> experiment, the sweep reactivates and obviously then the spectra are
> rubbish. What are we doing wrong ?
>
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