Date: Wed, 26 Nov 2014 11:50:25 -0500
Dear Spinlanders:
This is my first post to this listserv , and I hope that it's as successful
in getting help as the ones I've read over the years. We have a Bruker
Avance II, 500 MHz, which we acquired in 2005. We have two probes, a BBO
and a TXI. Some time ago, perhaps more than a year, we began having
problems with the BBO. Every once in a while we would get a lock signal
with sample in place that had a glitch in it that looks a bit like a
Z-gradient spike (see attache photos). When the sample is spun, the
spinning is revealed in the glitch. The glitch repeats about every 3-4
seconds, although the interval varies somewhat over a longer period of
time. At first this glitch disappeared spontaneously, but it would return,
and with the passage of time, sooner. More recently, the glitch seems
permanent. Also we have been getting an error message on our BSMS: "E:84
BSMS Excessive Coil Power. press 'STD By' " This comes intermittently;
sometimes several hours will pass without having the error show. We can do
Topshim, although it's not great because of the glitch, and we can shim by
hand, but it's difficult. We can obtain spectra, too, using the BBO.
We've been in touch with the Bruker folks, and swapped out a variety of
boards with no effect. We sent our BBO probe back to Bruker, and they
cleaned and tweaked it and could find nothing wrong, including testing in
an instrument. We got it back and the same problem is present.
Before we sent the BBO probe back to Billerica, we went over to the TXI
probe. It has been functioning perfectly for three months, with no sign of
the glitch, no excessive coil power message, shimming and spectra just fine.
We are at our wits end. Can anyone help? Please respond to me off the
listserv if you have any thoughts.
Best wishes for a good Thanksgiving.
Robin
-- Robin B. Kinnel Silas D. Childs Professor, Emeritus Department of Chemistry Hamilton College 198 College Hill Road Clinton, NY 13323 315-859-4725 FAX 315-859-4807
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