Solvent suppression by presaturation

These instructions should work on all Varian spectrometers.

Text in bold should be typed on the command line with [return] after each line.

Set up the experiment as you normally would, lock and shim the sample
dn='H1' dm='n' nt=1 ss=0 gain=0 ga
When the spectrum is displayed set the cursor on the solvent signal.
nl sd
dm='ynn' dpwr=12 dmm='c' homo='y' d1=2
ga
When the spectrum appears, examine the solvent peak.
If the solvent peak is still larger than the signals you wish to observe:
dpwr=dpwr+3 dpwr? NEVER increase dpwr beyond 30!
Run the spectrum again and keep increasing dpwr until you get acceptable supression of the solvent peak or dpwr reaches 30, whichever happens sooner.
When you are happy with the power setting:
gain='n' ss=2 nt=16 or however many scans you think you will need.
Start your acquisition and process as you normally would.