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</style><article id="node-479065" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3406233" rel="bookmark">Dynode signal check for noise issue </a>
</h1>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3406233" class="lognumber" data-lognumber="3406233">3406233</a>. Submitted by <a href="https://logbooks.jlab.org/user/liye">liye</a> on <time datetime="2016-05-24T18:51:33-0400" pubdate="pubdate">Tue, 05/24/2016 - 18:51</time>. </p>
<p class="last-update">
Last updated on <time datetime="2016-05-24T18:57:17-0400" pubdate="pubdate">Tue, 05/24/2016 - 18:57</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/pradlog">PRADLOG</a></td></tr><tr><th>Tags: </th><td><a href="https://logbooks.jlab.org/tag/detector">Detector</a></td></tr><tr><th>Entry Makers: </th><td>liye</td></tr></table></div>
<div class="logentry node-content">
<p>In order to reduce the noise level of Dynode total sum of HyCal, I checked Dynode noise .<br />
1. The noise level for vme crate is about 30mV .<br />
2. The noise level for output of UVA module is about 10mV , (detailed data as follow:)<br />
Dynode Group noise level (mV)<br />
G11 ~~ 4.8 G1~~ 6.8 W33~~ 6.8 G5~~6.0 G15~~6.8<br />
G16 ~~5.2 G6~~ 7.2 W3 ~~12.4 G10~~ 5.6 G20~~ 6.4<br />
G21~~5.2 W31 ~~ 8.4 W9 ~~ 10.8 W30 ~~10.2 G25 ~~ 6.4<br />
W7 ~~12.4 W19~~ 10.4 W15 ~~ 7.6 W6~~ 9.6 W12~~75.0<br />
W25 ~~ 10.8 W13 ~~ 8.8 W21~~7.6 W18~~ 9.6 G24 ~~7.2<br />
G2 ~~ 5.6 W1~~ 10.8 W27 ~~ 7.2 W24~~ 11.2 G4~~11.2<br />
G22~~6.4 W14 ~~10.8 G23~~29 W36 ~~11.2 W23 ~~ 11.2<br />
W32~~10.4 W8 ~~ 11.6 G3~~12 W5 ~~ 8.8 W29~~7.4<br />
W26 ~~13.6 W2 ~~ 11.2 W28 ~~ 35 W11~~ 20.0 W35~~11.2<br />
W20 ~~ 13.6 W22 ~~ 12.8 W17 ~~12.4 W34~~ 44.8<br />
W16 ~~ 25.2 W4~~11.2 W10 ~~ 23.0 </p>
<p>3. Few bad groups were found , G23( 29mv) ,G3(75mv) ,W28(35mv), W16(25mv),W10(23mv), W11(20mv),W12(75mv),W34(45mv).<br />
For those "bad" modules , checked all the channels and found the noise level determind by the noise level of channels.<br />
for G3 group -- channel G136 was bad , large noise (90mV) with 2KHz appeared, for W12 group channel W335 was bad ~ 70mV and most of channels were bad.<br />
havent got chance to check group W34,will do.</p>
<p>conclusion : noise level of Dynode total sum signal came from the individual channel (most likely from divider), UVA module and vme crate have small effect on this noise issue.</p>
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