62 (107) BRUKER CryoProbe User Manual
Recommended NMR parameters
NOTE: At high decoupling power levels the z-shim may change slightly. To pre-
serve optimum resolution do the following:
Table 5.1. How to determine ∆z
step action
w.1 Set the lock gain such that the lock is on the top gridline in your lockdis-
play. Run your particular experiment with gs for a couple of minutes
and determine the amount ∆z you have to change your z-shim to have
the lock back to the top gridline.
w.2 Add some dummy scans to your experiment and add ∆z to the z-shim.
w.3 Run your experiment.
w.4 Once the experiment is finished, subtract ∆z from the z-shim.