Hello Spinlanders,
Have observed following with respect to 'Field' value on console system
control microprocessor with same sample in CDCl3:
04 March 2005, Field = - 4611
06 " " " -4611
14 " " " -4692
23 " " " -4820
30 " " " -4899
07 April " " -4978
17 " " " -5112
18 " " " -5119
19 " " " -5128
20 " " " -5162
21 " " " -5165
22 " " " -5158
Above values are the values selected by the 'Autoshim' procedure after
shimming sample for optimal signal.
System was last pumped and energized 14 January 2005. System was last
cryoshimmed 17 February 2005.
Have any of you folks made similar observations? If so, what problem(s) lie
ahead for our NMR system and what are the preventative/restorative
maintenance procedures that are recommended at present time?
Will post summary of helpful responses.
Thank you and kind regards,
Lawrence
Lawrence Byrnes,
Lab Manager and
Research Director
Numare Spectralab and
The Schoenenberg Institute of Molecular Spectroscopy
Hidden Meadow Farm
3551 Winding Road,
Kintnersville, PA, 18930
Voice: 610-346-8660
Fax: 610-346-7571
E-mail: numare_at_eclipse.net
Web: http://www.eclipse.net/~numare/
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Received on Fri Apr 22 2005 - 17:45:26 MST