Agilent Technologies VARIAN Dual, Manual, Page: 27 / 30

Dual and Dual Broadband NMR Probes
26
Dual and Dual Broadband NMR Probes Installation 01-999124-00 J 0606
And if present,
mv ~/vnmrsys/shims/dmso
.
mv ~/vnmrsys/shims/d2o
.
mv ~/vnmrsys/CD3OD
.
Go to the next section to configure the
setlk
macro.
Configuring the setlk Macro
A properly configured
setlk
macro is critical to Autolock and Autoshim performance
and GLIDE performance. Once properly configured,
setlk
allows the system to perform
the following adjustments for each system:
• Explicitly set z0 , lockpower , and lockgain .
• Retrieve solvent-based shim sets.
Explicitly setting
z0
,
lockpower
, and
lockgain
for solvents typically used ensures the
best possible results when using Autolock. The reliability of Autolock is especially
important for the first sample of an automation run—if lock power has been low, the first
sample may not be run because of an Autolock failure.
Use the following steps to configure the
setlk
macro.
1. Using a text editor such as
vi
, open the file
/vnmr/maclib/setlk
.
2. To allow the system to automatically retrieve a set of shims for each solvent, remove
the double quotes around the following lines:
if ($e>0.5)or($e1>0.5 then
rts($solv)
else
exists('/shims/cdcl3','file'):$e
exists(sy'/shims/cdcl3','file'):$e1
if (($e>0.5)or($e1>0.5) then
rts('cdcl3')
endif
endif
3. Remove the quotes from the lines with the solvents you plan to use. Replace the
appropriate values of
z0 , lockpower , lockgain using the values you wrote
down during the ATP or when you locked and shimmed on other solvents.
The example below shows some of the entries with the Z0 value entered. The Z0
value represents the value of Z0 shown in the lock display in
acqi
.
if $solv='cdcl3' then z0=512 lockpower=37 lockgain=41 else
if $solv='d2o' then z0=521 lockpower=37 lockgain=48 else
if $solv='acetone' then z0=512 lockpower=21 lockgain=39 else
if $solv='dmso' then lockpower=33 lockgain=36 else
if $solv='c6d6' then lockpower=20 lockgain=39 else
if $solv='cd3od' then lockpower=25 lockgain=35 else
lockpower=30 lockgain=40 endif endif endif endif endif endif
Note that you should have one
endif
for each
if
in the entries.
4. Save the file and exit the text editor. Clean up the VNMR file system as necessary.