Probe Setup, Operations, Probe Modifiers
User Manual Version 002 BRUKER BIOSPIN 41 (327)
Figure 3.32. Low temperature setup with B-CU X
Probe Setup, Operations, Probe Modifiers 3.7
Setting the Frequency Range of a Wideline (single frequency) Probe 3.7.1
In a single frequency design, there are more degrees of freedom in tuning the cir-
cuit. The frequency range is set by a suitable NMR coil (see Figure 3.26.
). Fine
tuning is done by a variable capacitance (1) and a fixed capacitance inside an ex-
changeable tuning insert (3). The purpose of this setup is to adapt the probe to
the desired task as much as possible. A wideline probe has to cope with a large
range of frequencies and line widths, and must provide the shortest possible puls-
es and highest possible sensitivity at the shortest possible dead time. These re-
quirements cannot be met with one standard setup. Principles of setting up such a
probe are:
1. Select an NMR coil (2) with highest inductance that can still be tuned to the re-
quired frequency. Choose the smallest coil diameter permitted by your sample,
reduce the sample diameter if appropriate
2. Select the symmetrization insert such that the desired frequency is close to the
upper end of the available tuning range
1. To bypass (when heater is off)
2. VT gas in, from B-VT 3000
3. Control, to B-VT 3000
4. Heater in/out (unused)
1
2
3
4
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