Agilent Technologies VARIAN Dual, Manual, Page: 26 / 30

01-999124-00 J 0606 Dual and Dual Broadband NMR Probes Installation
25
Testing Probes on MERCURYplus
To ensure that C
6
D
6
lines are fully relaxed, wait at least 8 minutes between
acquisitions.
6. The signal of interest is the highest line of the
C
6
D
6
triplet (left side of display as shown in
Figure 9 ).
7. Select a 1400 Hz wide noise region between
the C
6
D
6
and dioxane peaks, using the cursors.
8. Enter
dsn
.
The computer calculates the signal-to-noise
ratio.
9. Write the results for each probe in the forms
provided in
Test Results, page 27 .
10. After the specifications are met, do the following:
• Write down the values for
z0
,
lockpower
, and
lockgain
as they appear in
the Acqi window. Use the forms provided in Test Results, page 27 .
• Save the shims by entering
svs('c6d6')
.
Setting Up the Solvent-Based Shim Files
During the probe acceptance test procedures (ATP), at least three solvent-based shim files
were saved:
acetone
,
cdcl3
, and
c6d6
(the file
dmso
would have been saved for a
400-MHz system or with a probe with
15
N). Other solvents that GLIDE supports by default
are D
2
O and CD
3
OD. The steps below describe how to save other solvent-based shims and
move the shim files to the
/vnmr/shims
directory. You must still be logged in as
vnmr1
.
Note that starting with VNMR 6.1, the names for shim files should be all lower case.
1. Do the following for the primary solvent used:
• Acetone, CDCl
3
, and C
6
D
6
(as in the ATP), skip to step 2 .
• D
2
O or CD
3
OD (or DMSO and it wasn’t used in the ATP) are used in addition
to the solvents used in the ATP, set up the shim files for these solvents as
follows:
a. Lock and shim on each solvent.
b. Write down the values for
z0
,
lockpower
, and
lockgain
for each
solvent. These values are displayed in the Acqi window.
c. Save the shims with the
svs
command. Use the following commands in the
VNMR input window:
•
svs('d2o')
if the solvent is D
2
O
•
svs('cd3od')
if the solvent is CD
3
OD
•
svs('dmso')
if the solvent is DMSO.
2. Open a shell tool or a Terminal window (still logged in as
vnmr1
)
3. Move the shim files from
~vnmrsys/shims
to
/vnmr/shims
by changing to
the
/vnmr/shims
directory and using the
mv
command. Note the dot at the end of
each
mv
command.
cd /vnmr/shims
mv ~/vnmrsys/shims/acetone
.
mv ~/vnmrsys/shims/cdcl3
.
mv ~/vnmrsys/shims/c6d6
.
Figure 9.
13
C Sensitivity
Hz 7000 8000 9000 10000 11000 12000 13000 14000
p-Dioxane
Benzene-d6