Couldn't they use 2 consecutive 24 bit words for this? since this is the
way the data would be stored anyway? Perhaps it is some other technical
detail related to the digitizer?
Our AM300 only has a 12 bit digitizer, and we often run in sim mode with no
problems. Dynamic range seems the same in both modes. Sometimes baseline
is flatter in sim, though.
Anyone at Bruker care to comment?
> tech support folks, SIM apparently works fine with DR=12 although this
> puts a fair number of interesting experiments needing high DR out of
> reach (e.g. nat'l abundance 13C/15N expts, looking at 1H spectra in
> H2O, etc). I wholeheartedly sympathize with your concerns, on both
> practical and theoretical grounds --- does anyone know if this has been
> cured in the more recent generations of machines/computers from
> Bruker?
Our AMX500 has a 16 bit digitizer, and we routinely use it in the
"qsim" mode, rather than "qseq". I am gradually changing out stock
parameter sets all over to "qsim". Dynamic range is the same (excellent)
in both modes.
The 2D/3D processing software allows all combinations (I think) of
detection modes in the different dimensions. eg. qsim in F2, TPPI in F1;
qseq in F2, States in F1, etc.
-- Kirk Marat NMR Facility Manager Dept of Chemistry / Prairie Regional NMR Centre University of Manitoba, Winnipeg, MB, CANADA, R3T 2N2... Criminal Lawyer (n): redundant term, see WEASEL