Of course a check if s/n on the deuterium channel would be a good idea as well
> From: main_at_ammrl.groups.io on behalf of Anklin, Clemens via groups.io
> Sent: Saturday, January 18, 2025 1:38:45 PM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: Re: [AMMRL] "Topshim Failed: Signal to noise is too low"
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 sample
s 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 Mon Jan 20 2025 - 01:34:03 MST