58 (93) BRUKER CryoProbe Installation
Customizing the CryoProbe System
when entering the CryoProbe. Special care must be taken to avoid leaks such that
the VT gas remains dry and its flow rate constant.
Sample tubes and spinners 4.1.6
A CryoProbe has smaller tolerances for sample spinning that conventional
probes. Therefore, the spinning properties of a selection of typical customer sam-
ple tubes and spinners should be tested. Avoid cheap sample tubes or spinners
with poor axial symmetry.
Receiver sensitivity 4.1.7
For small receiver gain values, i.e. rg < ~256, the signal-to-noise tends to de-
crease in proportion to rg. If the CryoProbe will be used mostly with samples that
yield strong NMR signals like H
2
O solutions, a reduction of the overall receiver
gain may be beneficial because this decreases also the noise added by the re-
ceiver. The modification is a jumper setting in the RX22, ECL07 or later, according
to the description given on the board itself. As a consequence, higher rg values
than before will be required for all measurements.
CAUTION: Switch off the AQR and ensure ESD protection before manipulating
the highly sensitive RX22 board.
Acceptance tests 4.2
0
Repeat the finaltests contained in the CryoProbe’s customer documentation fold-
er.
User training 4.3
0
0
See the checklist "User training" on page 76
.
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