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Beni, that assumes that the ADC effectively uses 16 bits and is also set to 0-5V range. </div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="ContentPasted0">The step size seen in the archiver data is 0.022kPa, which is very close to 1mV change from the sensor. The document <a href="https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1769-um002_-en-p.pdf" id="LPlnk505715">https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1769-um002_-en-p.pdf</a> shows
that the ADC can use 15 bits for 0-10V, or can use the same 15 bits for 0-5V mode. Table 3.8 in the same document shows the effective resolution of the ADC channels for different filter frequency, and my understanding of that table is that at the 50/60Hz filter
frequency setting the effective resolution of the ADC channel is 1mV (called 1mV/count in the table). Since Bobby or Nick configured the ADC with the filter frequency to 60Hz, that is apparently what we are seeing. </span><br>
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I would try running that ADC with 10Hz frequency filter instead of 60Hz, <span style="background-color:rgb(255, 255, 255);display:inline !important" class="ContentPasted1">but only for the newly bought sensor,</span> and see if we get a better resolution in
MYA. Of course, now we are talking about measuring a fraction of millivolt increments which probably means that it will not be a very accurate measurement, but that is a different issue. </div>
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But in general, this sensor, according to its specs, has uncertainty of 1.5kPa over the full dynamic range which is 10 times larger than the alarm limit we are setting. </div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Hovanes. </span><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Halld-controls <halld-controls-bounces@jlab.org> on behalf of Beni Zihlmann via Halld-controls <halld-controls@jlab.org><br>
<b>Sent:</b> Thursday, March 23, 2023 11:55 AM<br>
<b>To:</b> halld-controls@jlab.org <halld-controls@jlab.org><br>
<b>Subject:</b> Re: [Halld-controls] FCAL-II controls discussions</font>
<div> </div>
</div>
<div>According to the spec sheet the sensitivity of the sensor is 21.8 Pa/mV (0 to 5V range)<br>
the sensitivity of the ADC is 0.076mV/ADCcount<br>
So the digitizer is way more sensitive than the sensor.<br>
<br>
cheers,<br>
Beni<br>
<br>
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<div class="x_moz-cite-prefix">On 3/23/23 11:22, Bobby Bunton via Halld-controls wrote:<br>
</div>
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Hello all,<br>
<br>
Per our discussion in the controls meeting today, here is the information that was requested.
<br>
This is the pressure sensor we are using, Apogee instruments SB-100 barometric pressure sensor<br>
<a href="https://www.apogeeinstruments.com/sb-100-barometric-pressure-sensor/?gclid=Cj0KCQjw8e-gBhD0ARIsAJiDsaXMs3PuHfNMhwpBGExj1jN6KtLCpGJEFnUSc3kbAtm8uM88eItx8jIaAsGDEALw_wcB#product-tab-description" data-auth="NotApplicable" id="LPlnkOWALinkPreview" class="x_moz-txt-link-freetext">https://www.apogeeinstruments.com/sb-100-barometric-pressure-sensor/?gclid=Cj0KCQjw8e-gBhD0ARIsAJiDsaXMs3PuHfNMhwpBGExj1jN6KtLCpGJEFnUSc3kbAtm8uM88eItx8jIaAsGDEALw_wcB#product-tab-description</a><br>
<br>
And the PLC module that is reading it is a compact i/o 1769-IF8, the module is configured with the 60hz selection filter<br>
<br>
<a href="https://literature.rockwellautomation.com/idc/groups/literature/documents/in/1769-in067_-en-p.pdf" data-auth="NotApplicable" id="LPlnk172968" class="x_moz-txt-link-freetext">https://literature.rockwellautomation.com/idc/groups/literature/documents/in/1769-in067_-en-p.pdf</a><br>
<br>
Also ive already switched the old sensor back to being the input for barpress1 and put an offset on the barpress2 channel so that they more closely agree, please let me know if there is any more information you need.<br>
<br>
Thanks,<br>
Bobby<br>
<div class="x__Entity x__EType_OWALinkPreview x__EId_OWALinkPreview x__EReadonly_1">
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<a href="https://www.apogeeinstruments.com/sb-100-barometric-pressure-sensor/?gclid=Cj0KCQjw8e-gBhD0ARIsAJiDsaXMs3PuHfNMhwpBGExj1jN6KtLCpGJEFnUSc3kbAtm8uM88eItx8jIaAsGDEALw_wcB#product-tab-description" data-auth="NotApplicable" id="LPImageAnchor200098"><img id="LPThumbnailImageId200098" alt="" width="240" height="129" style="display:block" src="https://cdn11.bigcommerce.com/s-0oei9zu/products/81/images/2992/baro-top-down__22994.1586801524.220.220.jpg?c=2"></a></div>
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<div id="LPTitle200098" style=""><a href="https://www.apogeeinstruments.com/sb-100-barometric-pressure-sensor/?gclid=Cj0KCQjw8e-gBhD0ARIsAJiDsaXMs3PuHfNMhwpBGExj1jN6KtLCpGJEFnUSc3kbAtm8uM88eItx8jIaAsGDEALw_wcB#product-tab-description" data-auth="NotApplicable" id="LPUrlAnchor200098" style="text-decoration:none">SB-100:
Barometric Pressure Sensor</a></div>
<div id="LPDescription200098" style="font-size:14px; max-height:100px; color:rgb(102,102,102); font-family:"wf_segoe-ui_normal","Segoe UI","Segoe WP",Tahoma,Arial,sans-serif; margin-bottom:12px; margin-right:8px; overflow:hidden">
The SB-100 provides an accurate, stable, and durable measurement of barometric pressure at an affordable cost.</div>
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<a href="http://www.apogeeinstruments.com" data-auth="NotApplicable" class="x_moz-txt-link-abbreviated">www.apogeeinstruments.com</a></div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Halld-controls
<a href="mailto:halld-controls-bounces@jlab.org" data-auth="NotApplicable" class="x_moz-txt-link-rfc2396E">
<halld-controls-bounces@jlab.org></a> on behalf of Hovanes Egiyan via Halld-controls
<a href="mailto:halld-controls@jlab.org" data-auth="NotApplicable" class="x_moz-txt-link-rfc2396E">
<halld-controls@jlab.org></a><br>
<b>Sent:</b> Friday, March 10, 2023 9:17 AM<br>
<b>To:</b> <a href="mailto:halld-controls@jlab.org" data-auth="NotApplicable" class="x_moz-txt-link-abbreviated">
halld-controls@jlab.org</a> <a href="mailto:halld-controls@jlab.org" data-auth="NotApplicable" class="x_moz-txt-link-rfc2396E">
<halld-controls@jlab.org></a><br>
<b>Subject:</b> [Halld-controls] FCAL-II controls discussions</font>
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Hi all, </p>
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</p>
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I scheduled an extra meeting for next Thursdays, March 16, at 10am to discuss slow controls for FCAL-2 in details. Sasha will be presenting the requirements. There will be no other topics on the agenda for that meeting.
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We will have our regular Hall D controls meetings based on the usual schedule. </p>
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Hovanes. </p>
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<span class="x_x_DefaultFontHxMailStyle" style="font-family: Calibri, sans-serif; color: windowtext; font-weight: normal; font-style: normal;"><span style="font-size:12.0pt">Meeting ID: 160 842 9534</span></span></p>
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<span class="x_x_DefaultFontHxMailStyle" style="font-family: Calibri, sans-serif; color: windowtext; font-weight: normal; font-style: normal;"><span style="font-size:12.0pt">Passcode: 820920</span></span></p>
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<pre class="x_moz-quote-pre">_______________________________________________
Halld-controls mailing list
<a href="mailto:Halld-controls@jlab.org" data-auth="NotApplicable" class="x_moz-txt-link-abbreviated">Halld-controls@jlab.org</a>
<a href="https://mailman.jlab.org/mailman/listinfo/halld-controls" data-auth="NotApplicable" class="x_moz-txt-link-freetext">https://mailman.jlab.org/mailman/listinfo/halld-controls</a></pre>
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