Bruker CryoProbe - Page 4

4 (107) BRUKER CryoProbe User Manual
Contents
4.11 Low temperature limit in sample cavity .............................. 45
4.12 Tuning and matching ......................................................... 47
4.13 Shimming and Lock-in ....................................................... 48
4.14 Warm-up ........................................................................... 49
4.15 Removal ........................................................................... 49
4.16 Power-down ...................................................................... 52
4.17 Spectrometer operation with conventional probes .............. 53
5 Recommended NMR parameters ......................... 55
5.1 General ............................................................................. 55
5.2 Samples and spinners ....................................................... 55
5.3 Sample temperature control .............................................. 55
Measurements above TVT gas+ 3°C ............................. 56
Measurements below TVT gas+ 3°C ............................. 57
Tuning the regulation loop ............................................ 57
5.4 Wiring ............................................................................... 57
Preamplifier .................................................................. 58
Additional RF filters ...................................................... 58
5.5 RF power limitations .......................................................... 58
Peak RF power ............................................................. 58
Simultaneous hard pulses ............................................. 59
Average RF power ........................................................ 59
5.6 Receiver setting ................................................................ 60
5.7 Shimming .......................................................................... 60
Gradient shimming ....................................................... 60
H
2
O samples ................................................................ 60
5.8 Solvent suppression .......................................................... 61
5.9 Gradients .......................................................................... 61
5.10 Pulse programs ................................................................. 61
5.11 Automation ....................................................................... 61
6 Monitoring and Maintenance ............................... 63
6.1 Displays & Diagnostics ...................................................... 63
CryoTool interface ........................................................ 63
Warm-up needed soon request ...................................... 63
CryoProbe insulation indicator ...................................... 64
6.2 Periodic checks ................................................................. 64
Log-book ...................................................................... 64
Logfile .......................................................................... 66
Replacement of the He steel-cylinder ........................... 66
6.3 Software update ................................................................ 67
6.4 Cleaning ........................................................................... 67
Cleaning the sample cavity ........................................... 67
Panels and housings .................................................... 68
6.5 Scheduled maintenance .................................................... 68
7 Troubleshooting .................................................. 71
7.1 Emergency procedures ..................................................... 71
Emergency Off ............................................................. 71
7.2 First diagnosis .................................................................. 73