Bruker CryoProbe User Manual

RF problems
CryoProbe User Manual BRUKER 83 (107)
- Are the jumpers at the left side of the HPPR CRP modules in place (see Figure
4.12.)?
- Check crpwobb and wobb for all selectable channels. Do you get a tunable dip
on your display?
CAUTION: A CryoProbe must not be tuned or matched when warm.
- To check whether an RF problem has its origin in the ‘cold’ preamplifiers inside
the CryoProbe, use the conventional ‘warm’ preamplifier modules of the HPPR
CRP assembly instead. Select the ‘warm’ modules with crpoff and wobble
the CryoProbe before acquiring data.
-- Does the spectrometer work satisfactory with a conventional probe? Check in
particular those functions and measurements which seem not to work properly
with the CryoProbe, if possible.
Tuning/Matching not OK 7.7.1
CAUTION: A CryoProbe must not be tuned or matched when warm.
CAUTION: Some of the tuning elements are factory-set and have no correspond-
ing actuator in the Tuning Adapter. Do not attempt to change them.
CAUTION: Do not force the actuators beyond their easily recognizable limits
(clockwise: stop, counter-clockwise: overrun). Do not challenge the limits of the
tuning and matching range if there is no need. Do not use tools other that the Tun-
ing Adapter and the blue Tuning Tool to adjust the tuning or matching.
Execute crpwobb and wobb: a tunable dip must appear on the display for each
channel. This indicates if most of the signal routing to and from the CryoProbe
and most of the CryoProbe itself are working.
If wobbling fails, check if a conventional probe can be wobbled.
Resonance does not react on tuning or matching
The little color-coded knobs in the Tuning Adapter may get loose and turn freely.
Detach the Tuning Adapter from the CryoProbe and tighten the small nuts which
lock the tiny handle to the threaded stick. Put some superglue on the thread to fix
the nuts permanently.
Lock problems 7.7.2
No lock signal
If no lock wiggles appear after crpon, execute ii or lock to initialize the com-
munication.
Check if the lock channel can be wobbled: Set locnuc off in XWIN-NMR, es-
tablish the correct
2
H frequency and RF routing with edasp, execute crpwobb,
and run wobb. If wobbling works, the NMR coil, tuning elements, built-in transmit/
receive switch, and the 2H HPPR CRP module must be ok but the built-in cold
2
H
preamplifier is in doubt.

Bruker CryoProbe Specifications

General

Brand	Bruker
Model	CryoProbe
Category	Laboratory Equipment
Language	English