Locking in vnmr

From NMR Wiki

Default view of vnmr Acqi window. Buttons "Insert/Inject" control position of sample.

in vnmr command line type 'acqi' or click 'Acqi' button. A window as shown below will open.

Now click "Lock" button. The window will change into something like this:

The curve that you see in the window is an FID (free induction decay) of lock nucleus (most often-deuterium).