Continuing from last secton, type
array('pw', 20,1,1) (the syntax is
array('<parameter>', <number of increments>, <starting value>, <increment value>).
Then d1=5 at=1 ss=-1 bs=2 nt=8 gain=10 go. Type time to see how long it will take.
If you have an ADC overflow warning type aa gain=5 go, and repeat decreasing
gain until no warning is given. When the first message like BS 1 completed comes,
type wft vp=50 dc vsadj ai dssh dssl. Repeat this command (up-arrow will recall it)
when next BS (blocksize) spectra are ready. If, for example, the 5th peak is the
strongest, type ds(5) vsadj dssh dssl. When it finishes, search for the point where
the peak arrives the 180 degress in the sinoidal curve an set pw to the half of it.
Type dssh dssl da to look at the spectra array and to the array values
in the text window (in VnmrJTM click
->
).
If you need more precision, set a constant temperature and zoom in the regions where the signal has the 180 and the 360 degree rotations. For example, if you got the 180 pulse around pw=12, then type pw=3, 11.6, 12, 12.4, 23.6, 24, 24.4 pad=600 go. (pad will make the system wait 600 seconds before start aquiring, necessary for temperature stabilization.) Process as above and use the first increment for phasing. Calculate the 90-degree pulse from the 180- and 360-degree viewed in the array.