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Hi Tom,</div>
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<br>
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In the cases where there is no peak in the background data, how should the program handle it?</div>
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<br>
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Should it just use the overall maximum value in the background scaling?</div>
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<br>
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Tyler<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> dsg-hdice <dsg-hdice-bounces@jlab.org> on behalf of thomaso@jlab.org <thomaso@jlab.org><br>
<b>Sent:</b> Tuesday, October 27, 2020 5:24 PM<br>
<b>To:</b> dsg-hdice@jlab.org <dsg-hdice@jlab.org><br>
<b>Subject:</b> [dsg-hdice] fsNMR program broken when using background files</font>
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<div class="PlainText">Hi Tyler,<br>
<br>
Xiangdong and I confirmed the new 50 Ohm / 1 MOhm switch you added worked<br>
fine.<br>
<br>
However, we ran into a new issue with the fsNMR program. We took a set of<br>
sweeps for our background without issue. The problem arises when we<br>
select a previous background scan to use for subtraction during the signal<br>
scan.<br>
<br>
Normally the program looks for the peak value of the background curve as a<br>
step in the background normalization/subtraction process.<br>
<br>
In our case, we are looking for the signal in part of the curve. There is<br>
no peak in the region we are scanning. As a result, the program is unable<br>
to calculate values for R, X, and Y. The frequency column is fine since<br>
those values are not manipulated. The phase column is fine due to that<br>
being a straight subtraction between the two phase values (no<br>
normalization used).<br>
<br>
Could you please investigate this issue as soon as you can? We can give<br>
you access to the PC anytime you need, just let us know.<br>
<br>
Thanks,<br>
Tom<br>
<br>
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