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Hi Xiangdong,</div>
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I looked at the fsNMR program and found a few bugs that I have now fixed:</div>
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<ul>
<li>Auto-adjustment of lock-in amplifier gain was incorrectly using X measurement rather than amplitude</li><ul>
<li>This is probably why in all the plots with the odd stair-step appearance, the X data was the only one that looked okay.</li><li>I ran a test with the same frequency range (40 MHz - 45 MHz) as in your last results document but with only 200 steps (to get the program to run faster) and everything looked okay; no stair-step jumps.<br>
</li></ul>
<li>Program had a subVI that was settings it's attenuation to -63 dB after a cycle, but the program never reset the attenuation to the user's set value.</li><ul>
<li>The setting to -63 dB explains why data was so small for subsequent cycles.</li><li>This incorrect behavior has been corrected and the signals look very similar between cycles.</li></ul>
<li>Found that if background subtract was not used, program was still subtracting 1 from all data</li><ul>
<li>This caused all data to be offset by ~1 and in turn caused data to look odd/not expected when background scaling was used.</li><li>After finding and fixing this, when background subtraction and scaling was then used, the results were all centered somewhat around zero.
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With these fixes, the issues you noted in your last results PDF seem to be resolved.<br>
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Right now, I'm in the process of running a test with the same settings as in your PDF (40 MHz - 45 MHz, 2500 steps), but with only 10 cycles. As of this email, the program is on cycle 5 of 10 with no background subtraction/scaling. So far, everything looks
good. Once that is complete, I'll use the results as the background for a second test. I expect these tests to run take the rest of the afternoon and maybe into the evening.</div>
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I will also be working on a short procedure on how to run the fsNMR program in various modes and will send that when it's done.<br>
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Best regards,</div>
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Tyler</div>
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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 Tyler Lemon <tlemon@jlab.org><br>
<b>Sent:</b> Monday, June 22, 2020 5:16 PM<br>
<b>To:</b> Xiangdong Wei <xwei@jlab.org>; dsg-hdice@jlab.org <dsg-hdice@jlab.org><br>
<b>Subject:</b> Re: [dsg-hdice] fsNMR test results</font>
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Hello,</div>
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Attached is the document Xiangdong sent that I forgot to attach to my previous email.</div>
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Tyler<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Xiangdong Wei <xwei@jlab.org><br>
<b>Sent:</b> Monday, June 22, 2020 4:55 PM<br>
<b>To:</b> Tyler Lemon <tlemon@jlab.org><br>
<b>Subject:</b> fsNMR test results</font>
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Hi Tyler,</div>
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The attached pdf file contain a preliminary test results of stage 1 and stage 2 fsNMR VIs. Please take a look. </div>
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I am not available for meetings on Thursday and Friday, but I can still reading email.</div>
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Thanks,</div>
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Xiangdong</div>
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