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Dear Brian, Morgan,</div>
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<br>
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Thanks for helping and identifying the problem.</div>
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I am okay and really happy to see that is the troubleshooting we need to do on LV chassis and nothing wrong in the magnet or with the sensor.</div>
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<br>
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Brian had the plan to get this fixed as soon as he can find the replacement option.</div>
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<br>
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Regards</div>
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Probir</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-hallb_magnets <dsg-hallb_magnets-bounces@jlab.org> on behalf of beng--- via Dsg-hallb_magnets <dsg-hallb_magnets@jlab.org><br>
<b>Sent:</b> Wednesday, May 22, 2024 1:40 PM<br>
<b>To:</b> dsg-hallb_magnets@jlab.org <dsg-hallb_magnets@jlab.org><br>
<b>Subject:</b> [Dsg-hallb_magnets] [New Logentry] Follow-up Re: TR8122A Flakey Readout</font>
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<h1 class="x_node-title"><a href="https://logbooks.jlab.org/entry/4308937" rel="bookmark">Follow-up Re: TR8122A Flakey Readout</a>
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<li><a href="https://logbooks.jlab.org/entry/4308937/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4308937/delete?destination=email/send">Delete</a></li></ul>
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<p class="x_author-datetime">Lognumber <a href="https://logbooks.jlab.org/entry/4308937" class="x_lognumber" data-lognumber="4308937">
4308937</a>. Submitted by <a href="https://logbooks.jlab.org/user/beng">beng</a> on
<time datetime="2024-05-22T13:35:05-0400"><a href="https://logbooks.jlab.org/entries?start_date=1716395705&end_date=1716402905&book=DSGLOG&book=HBTORUS">Wed, 05/22/2024 - 13:35</a></time>.
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<th>Logbooks: </th>
<td><a href="https://logbooks.jlab.org/book/dsglog">DSGLOG</a> <a href="https://logbooks.jlab.org/book/hbtorus">
HBTORUS</a></td>
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<th>Entry Makers: </th>
<td>ghoshal, mcookiv</td>
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<th>References: </th>
<td><a href="https://logbooks.jlab.org/entry/4304555">4304555 - TR8122A Flakey Readout</a></td>
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<div class="x_logentry x_node-content">
<p>We first tried disconnecting and reconnected fro the back of the LV chassis, readout was still bad.</p>
<p>Morgan and Probir accessed the top of the service tower to clean/reseat the connectors at the top, still bad.</p>
<p>Finally we tried moving the connector to a different channel on the same LV chassis just to see what would happen, readout stopped alternating between two values like it was previously. The temperature was wrong, but that is expected as it was now using
the wrong sensor calibration.</p>
<p>Further troubleshooting to follow ... first step will be to find spare boards used in the LV chassis and just try swapping those out.</p>
<p>Explanation of the numbers in the attached plot.</p>
<p>1 = Disconnected J7 from back of Chassis #1<br>
2 = Morgan disconnected from top of Service Tower<br>
3 = Disconnected again and additional cleaning from top of Service Tower<br>
4 = J7 and moved on to J6 (see swapped plot)</p>
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<div class="x_image-wrapper"><img class="x_image-style-plentybig" width="960" height="512" alt="" title="Sequence of events when troubleshooting" src="https://logbooks.jlab.org/files/styles/plentybig/public/2024/05/4308937/tr8122a.png"></div>
<div class="x_image-wrapper"><img class="x_image-style-plentybig" width="960" height="1005" alt="" title="J7 connected to J6, stable readout" src="https://logbooks.jlab.org/files/styles/plentybig/public/2024/05/4308937/tr8122a swap.png"></div>
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