Bruker BioSpin Solid State NMR, User Manual

Page: 50 / 328

50 (327) BRUKER BIOSPIN User Manual Version 002
General Hardware Setup
These inserts can be made to optimize the X or the Y channel. They should be
mounted in exactly the position as indicated on the information sheet included
with the probe.
Reversing the trap may mess up tuning! Observe probe manual instructions! For
low range (below
13
C) nuclei, the probe must be in λ /4 mode. Combinations of
low/high range nuclei are difficult/impossible and always lossy!
Mounting the Probe in the Magnet/Shim Stack 3.8
Usually, the service engineer installing the magnet and the rack has considered
the local restrictions, and placed the system such that all operations which may be
required for the proper probe installation are conveniently possible. This refers to
the ease of access of the magnet bore from below and above, to mount the probe
and the sample insert devices, and also to the possibility to place VT equipment
(liquid N
2
dewar, B-CU 05 or B-CU X) in a convenient location that allows access
without restricting standard operations.
Depending on the type of probe, VT control gas enters the probe from the side or
from behind. So it must be possible to attach the heat exchanger transfer line from
the appropriate side. Furthermore, the weight of the transfer line must be relieved
from the probe dewar ball joint, so there should be appropriate fixation points for
the transfer line. It is important that the transfer line enters the ball joint as straight
as possible, as a ball joint will cut off the flow when strongly tilted to an angle.
It should also be possible to reach the probe tuning elements (since they need to
be operated frequently) as easily as possible from the operators chair. Also, when
tuning the probe, the video screen and the preamplifier display should be easily
visible.