Hi Clemens,
In 3D or 1D version, use topshim durmax=60?
Fu
On Sat, Jan 18, 2025 at 8:39 AM Anklin, Clemens via groups.io wrote:
> Hi Beth
>
> I would support Feng's suggestion with checking the 2H tuning. Easiest
> way is: rpar gradshim1d2h, wobb.
> Unfortunately adjusting the 2H tuning is not that easy.
>
> You can add an option to topshim to increase the scans. Add the option
> "durmax=xx" typically a value of 60 will improve matters.
>
> If that helps you need to change the shim command in ICONNMR to "topshim
> durmax=60"
>
> Shimming will take a bit longer but it is more likely to succeed.
>
> Best regards
>
> Clemens
>
> On 1/17/2025 1:16 PM, Beth Moscato via groups.io wrote:
>
> 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 Tue Jan 21 2025 - 07:54:38 MST