Dear all,
We have a Bruker DRX300 wide bore magnet which has a 5mm upper stack
insert for doing routine 5mm samples. There is an ongoing problem with
spinning regulation. In the past when samples didn't spin well we could
solve the problem by getting a new spinner or cleaning the O-rings and
spinning turbine on the room temp shim assembly. This time there is no
problem spinning the sample, the problem is with spin detection. If we
look at the spinning side band on 1H spectra the spin rate is actually
25 Hz, but the sensor can only detect up to 7 Hz, higher than that the
sensor will register 0 Hz on the BSMS. Bruker currently doesn't have
another 5mm upper stack insert in stock so we cannot know for sure
whether the sensor is causing problem. The spinners we have are new and
have no problems in our other two regular bore Bruker magnets. Could
the sensor be sensitive to the type of black and white labels on the
spinners in a wide bore system? What other kind of labels could we try?
Have Any of you had similar problems?
Thanks in advance for your suggestions.
Wei
Wei Wycoff
125 Chemistry Building
601 S. College Ave
University of Missouri-Columbia
Columbia,
MO 65211
USA
Phone: (573) 882-3291
Fax: (573) 882-2754
Email: WycoffW_at_missouri.edu
http://www.chem.missouri.edu/nmr/nmr.html
Received on Tue Nov 02 2004 - 17:34:01 MST