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Z31980_00_03
Installation
As explained in the previous chapter, some of the parameters have a different value
range. This applies mainly to the PID parameters. Increasing loop gain and loop time
results in a more rigid coupling to the lock signal (fast regulation with a higher risk to see
lock artefacts in the baseline next to intense resonance lines). Decreasing them results
in less coupling (slow regulation, not suited to fast disturbances, but less baseline arte-
facts).
The “loop filter” is only applied on the lock data as they are displayed on the screen. The
higher the value, the more data points are averaged to reduce noise.
6.9.2 Finding a Lock
If the lock is set up correctly, there is no need to search for the lock manually. The lock
command will result in the lock system to read all parameters from the edlock file and to
perform an automatic search and lock procedure.
During installation or in case the magnetic field changed by a considerable amount, it is
necessary to find the lock signal for at least one solvent. This way, the field value defin-
ing the B
0
shim current can be set correctly.
There are two possibilities to find the lock.
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