CryoProbe Installation BRUKER 57 (93)
Customizing the
CryoProbe System 4
4000000
Experimental parameters 4.1
0
RF power levels 4.1.1
Maximum RF powers are specified in Watt for each CryoProbe on its ‘L
IMITATIONS
- WARNINGS’ sheet. Since the relation between absolute power and pl values de-
pends on the actual spectrometer hardware, the RF limits must be translated into
power levels pl. If C
ORTAB is used on the spectrometer, determine them with the
actual C
ORTAB and - for safety - without CORTAB. Write these pl values down on
the ‘L
IMITATIONS - WARNINGS’ sheet and notify the NMR superuser.
Safety attenuators 4.1.2
If desired by the customer, insert RF attenuators before the inputs of the RF am-
plifiers such that their maximum output power at pl=-6 does not exceed the lim-
its of the CryoProbe.
Standard parameter sets 4.1.3
Enter the CryoProbe into the edhead table and store its pulse parameters for use
in routine operation or automation.
Lock power 4.1.4
In contrast to the 1H and X channels, the lock channel of a CryoProbe may need
as much (or even more) RF power as in a conventional probe. Initiate an automat-
ic lock, perform an A
UTO LOCK POWER calibration with the BSMS keyboard, and
store the result in the CryoProbe’s edlock table.
Sample temperature control 4.1.5
Self-tune the VT unit (see User Manual, “Tuning the regulation loop” on page
57).
When using a BCU05 gas cooler, care must be taken that the VT gas is not colder
than the lower sample temperature limit (see L
IMITATIONS - WARNINGS sheet)
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