Hi everyone-
We have an AVANCE III (TS 3.7pl5) that’s been sporadically failing
samples saying that the signal to noise is too low. Most of the samples seem
to be marginal quality – usually CDCl3, sometimes with precipitate or
water droplets – but they often manage to successfully shim on our
AV III HD spectrometer, and I’ve noticed a dramatic uptick in the
number of failures recently.
Note that most samples, including most samples in CDCl3, have successfully
run in TS. The TS data I’ve seen from the failed samples show a similar
pattern to those from normal samples (suggesting that the difference is
quantitative and not qualitative).
I’ve done a 3D shim recently, but it hasn’t helped. The lock
phase is set appropriately.
Is there a way to increase the number of scans acquired in TS for specific
solvents? I’m not thrilled with it as a work around, but if it stops
failing the samples, that would be an improvement over the current situation.
Thank you!
Beth Moscato
Temple University
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Received on Fri Jan 17 2025 - 11:13:01 MST