[dsg-hdice] fsNMR program broken when using background files

[Tyler Lemon]

Hi Tom,

Thanks for the info.

I have a morning and early afternoon filled with BlueJeans meets, so I'll plan to take a look on one of the HDice PCs around 3:00PM.

I have a few data sets from fsNMR runs saved locally on one of DSG's PCs so in the mean time between meetings, I'll look through those data sets to see if there's a set that doesn't have a peak and use that to start offline development of the fix.

Thanks,
Tyler
________________________________
From: thomaso at jlab.org <thomaso at jlab.org>
Sent: Wednesday, October 28, 2020 9:46 AM
To: Tyler Lemon <tlemon at jlab.org>
Cc: thomaso at jlab.org <thomaso at jlab.org>; dsg-hdice at jlab.org <dsg-hdice at jlab.org>
Subject: Re: [dsg-hdice] fsNMR program broken when using background files

Hi Tyler,

Yes, use the overall maximum value for the background scaling.  I forgot
to mention that.  If you are ready now, we can log off the NMR PC so you
can check it out.  Let me know when you would like to start.

Thanks,
Tom

> Hi Tom,
>
> In the cases where there is no peak in the background data, how should the
> program handle it?
>
> Should it just use the overall maximum value in the background scaling?
>
> Tyler
> ________________________________
> From: dsg-hdice <dsg-hdice-bounces at jlab.org> on behalf of thomaso at jlab.org
> <thomaso at jlab.org>
> Sent: Tuesday, October 27, 2020 5:24 PM
> To: dsg-hdice at jlab.org <dsg-hdice at jlab.org>
> Subject: [dsg-hdice] fsNMR program broken when using background files
>
> Hi Tyler,
>
> Xiangdong and I confirmed the new 50 Ohm / 1 MOhm switch you added worked
> fine.
>
> However, we ran into a new issue with the fsNMR program.  We took a set of
> sweeps for our background without issue.  The problem arises when we
> select a previous background scan to use for subtraction during the signal
> scan.
>
> Normally the program looks for the peak value of the background curve as a
> step in the background normalization/subtraction process.
>
> In our case, we are looking for the signal in part of the curve.  There is
> no peak in the region we are scanning.  As a result, the program is unable
> to calculate values for R, X, and Y.  The frequency column is fine since
> those values are not manipulated.  The phase column is fine due to that
> being a straight subtraction between the two phase values (no
> normalization used).
>
> Could you please investigate this issue as soon as you can?  We can give
> you access to the PC anytime you need, just let us know.
>
> Thanks,
> Tom
>
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