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Interesting.<br>
<br>
The readout crates each have 6 temperature probes available and I
wonder if the slow 3 hour wiggle correlates to the hall temperature
fluctuation. I saw the other BCAL mail regarding the voltage and
temperature stability, but the time scale was not close to 22 hours.
<br>
<br>
-Chris<br>
~~~~~~~~~~~~~~~~~~~<br>
<div class="moz-cite-prefix">On 5/6/2014 12:20 PM, <a class="moz-txt-link-abbreviated" href="mailto:dalton@jlab.org">dalton@jlab.org</a>
wrote:<br>
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<article id="node-358078" class="node node-logentry article
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<header class="node-header">
<h1 class="node-title" rel="nofollow"> <a
moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3285334"
rel="bookmark">BCAL pedestals monitored overnight</a>
</h1>
</header>
<div class="date-vitals">
<p class="author-datetime"> Lognumber <a
moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3285334"
class="lognumber" data-lognumber="3285334">3285334</a>.
Submitted by <a moz-do-not-send="true"
href="https://logbooks.jlab.org/user/dalton">dalton</a>
on <time datetime="2014-05-06T12:15:51-0400"
pubdate="pubdate">Tue, 05/06/2014 - 12:15</time>. </p>
<table class="field-vitals">
<tbody>
<tr>
<th>Logbooks: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/hdbcal">HDBCAL</a>
<a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/hdlog">HDLOG</a></td>
</tr>
<tr>
<th>Tags: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/tag/detector">Detector</a></td>
</tr>
<tr>
<th>Entry Makers: </th>
<td>dalton</td>
</tr>
</tbody>
</table>
</div>
<div class="logentry node-content">
<p>A pedestal run was taken overnight to monitor the BCAL
pedestals. The data was taken at a rate of 0.756 Hz for
a total of 22 hours leading to ~60000 events. The plots
show the pedestals as a function of event from about
1:20 pm on 5 May. Each page is for the 16 channels on a
single ADC. They were chose beecause they contained a
channel with a notable feature but on the whole this is
a representative sample. There is a clear wiggle with a
period of 3 hours and a couple minutes until about 4 am
when the behavior flattens out and becomes less regular.
At the most severe, the excursion is more than 6
channels peak-to-peak although there are also a few
channels with negligible drift. There is in addition, 1
channel which appears to have a discontiuity in it.</p>
</div>
<div class="attachment-box">
<div class="image-wrapper"><img
class="image-style-plentybig"
src="cid:part7.00090506.06050708@jlab.org" alt=""
title="roc 32, slot 5: channel with peedestal jump"
height="561" width="960"></div>
<div class="image-wrapper"><img
class="image-style-plentybig"
src="cid:part8.00040109.08000105@jlab.org" alt=""
title="roc 34, slot 5: channel with biggest change"
height="561" width="960"></div>
<div class="image-wrapper"><img
class="image-style-plentybig"
src="cid:part9.03000409.08000509@jlab.org" alt=""
title="roc 35, slot 6: channel with smallest change"
height="561" width="960"></div>
</div>
</article>
</div>
</div>
<br>
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<br>
<pre wrap="">_______________________________________________
Halld-cal mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Halld-cal@jlab.org">Halld-cal@jlab.org</a>
<a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/halld-cal">https://mailman.jlab.org/mailman/listinfo/halld-cal</a></pre>
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