Bruker CryoProbe User Manual

58 (107) BRUKER CryoProbe User Manual
Recommended NMR parameters
NOTE: A Radiation Damping Control Unit (RDCU) cannot be used because it is
designed to be inserted in the single transmission line between preamp and
probe. A CryoProbe, however, has built-in CryoPreamps and the connection be-
tween NMR coil assembly and preamp is not accessible from outside. Thus, the
current versions of the two systems are incompatible.
Preamplifier 5.4.1
NOTE: Whenever there are two connectors per channel of the CryoProbe (trans-
mit and receive), there is a specific cryogenically cooled preamp build-in with su-
perior signal-to-noise. If there is only one connector, the conventional preamp in
the HPPR CRP will be used for detection. However, such a channel is not intend-
ed for observation and its sensitivity is generally not specified.
An HPPR CRP with more than 5 modules may require manual re-wiring for multi-
nuclear NMR experiments with a conventional probe (see "HPPR CRP configu-
ration" on page 44).
Additional RF filters 5.4.2
All necessary filters are already incorporated in the CryoProbe and the HPPR
CRP.
IMPORTANT: If it seems as if additional RF filters are needed there to improve
the performance of an experiment, there is probably a malfunction in one of the
RF components. In particular, no low frequency stop filters must be introduced
into the pulse transmission paths between HPPR CRP and CryoProbe.
RF power limitations 5.5
0
CAUTION: Before you enable the RF transmitters: Make sure that neither the
CryoProbe nor the HPPR modules can be overloaded by RF power.
Always ensure optimum tuning and matching because the unmatched case is
even more demanding for the RF electronics.
Keep parameter sets for conventional and CryoProbes well separated.
Peak RF power 5.5.1
Due to the high efficiency of the CryoProbe, the maximum RF power may be
significantly less than those on conventional probes. The highest power lev-
els available in A
VANCE spectrometers have the potential to destroy the NMR coil
assembly. Use power levels pl and sp higher than 10 dB (e.g. 6 dB, 0 dB, -3 dB
etc.) with extreme caution!
Before setting an RF power level pl or sp, look up the RF power limits
- of the CryoProbe on its specific L
IMITATIONS - WARNINGS sheet,
- of the built-in RF Unit and the HPPR CRP modules in the CryoProbe
RF Electronics Technical Manual, and

Bruker CryoProbe Specifications

General

Brand	Bruker
Model	CryoProbe
Category	Laboratory Equipment
Language	English