Hello Les,
We are an NMR Service company......We still support and re-ferb AMX series
NMR Consoles....I encounter this problem regularly when the capacitors in
the BSN18 dry up.
Simply shut off the BSN18 and run a back ground test....You will most
likely see the symptoms dissipate.
We have them in stock if you need replacement.....
Good luck let me know what you find
Arnold C.Itkin
NMR Associates
Professional NMR Products, and Services
978-632-0312
978-852-8316 Cell
978-665-9090 Fax
nmr.associates_at_att.net
www.nmr-associates.com
At 03:08 PM 2/27/04 -0500, you wrote:
>Hi all:
>
>We are having a problem with our Bruker AMX 400 that I hope someone out in
>NMR land can give us a hand with.
>
>Our spectra contain multiple sideband peaks (not spinning sidebands).
>These appear around the spectral peaks with approximately 120 Hz
>separations. They are very prominent in high concentration samples, but
>they can still be seen at low concentration if the spectra are blown-up.
>These peaks appear independent of the nucleus being observed but are much
>more prominent in 1H spectra.
>
>We have tried replacing the pre-amplifiers, Ecoupler, PTS, SE-451, and ADC
>to no avail. We did find some bad capacitors in the main power supply but
>fixing this problem did not remove the sidebands. We have replace a number
>of bad fans and reseated all of the boards which also did not change things.
>
>Bruker has suggested that there might be some kind of bad ground problem.
>Trying to track down something like that is like finding a needle in a
>haystack.
>
>Any suggestions would be greatly appreciated.
>
>Many thanks,
>
>Les
>
>
>**************************************************************************
>
>Leslie Gelbaum Phone 404 894-4079
>NMR Center Lab Phone 404-894-1827
>Georgia Tech Fax 404 894-7452
>Atlanta, Georgia 30332 E-mail lg2_at_prism.gatech.edu
>
>**************************************************************************
Received on Mon Mar 08 2004 - 10:52:16 MST