Date: Fri, 1 Feb 2013 18:53:43 +0000
Dear users:
Please help.
Somehow over a course of batch of samples the lock phase changes and then switches back to original lock phase.
We (service engineer) have boards replaced (lock trans, lock rec, shim dac) but nothing has solved the issue.
It doesn't depend on solvent or type of compound dissolved in the NMR sample, it just seems that the system just flips lock phase randomly throughout the day.
This is an older instrument (~10 years) and still running vnmr 6.1C on an Sun system.
We have even seen it with the lineshape sample also....
Has anyone seen this before and have any suggestions to what we should look into?
Thanks
Kim.
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Kimberly Yach
NMR Specialist
Analytical Chemistry
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