Unstable lock

Charles L. Anderson (shiulong@bayou.uh.edu)
Mon, 02 Nov 1998 10:54:53 -0600

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I seem to have developed a lock problem with our Bruker AMX(2)-600. I
couldn't obtain a stable lock while doing a routine line shape on our 5-mm
TBI probe with 1% CHCl3 in acetone-d6. I switched to 3% CHCl3 with the
same results. The lock power and gain are with in nornal limits so I am
not saturating the standard. If I use a 80% benzene in acetone-6 we do not
seem to have this problem. The spinner is off, the air flow down and we are
using a ceramic spinner so I don't think the sample is moving. Any insight
would be helpful.

Chuck

Charles L. Anderson, Ph.D.
Manager NMR Facilities
Department of Chemistry
University of Houston
Houston, TX 77204-5641
Office: (713)-743-2728
Fax: (713)-743-2709

"Anything one man can imagine
others can make true"
Jules Verne

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