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<font face="Arial">Good morning all. Betty Zhang at PNI is
responding to the request and has asked for more information which
I have supplied, including some of the JJ test comparisons, how I
ran the calibration runs I did, data reduction, etc. <br>
<br>
I would suggest one further item for consideration in getting to a
useable solution. If RM3100 temperature turns out to be a
concern, place the sensor in a small foam insulated box with a
proportionally controlled heater which maintains the temperature
at something just above what would be considered the highest
environmental temperature around the sensor. That should be
relatively simple to do without introducing an interfering
magnetic field local to the sensor. Some power would be required
but with careful design, I would think well within 1 watt.<br>
<br>
Another possibility would be using peltier effect heat pumps to do
the same thing, although the technology would probably result is
stronger local B fields from the peltier device and require more
power. The insulated foam box and proportional heater is also
probably the cheapest approach considering the need to keep
overall costs for the expected users low.<br>
<br>
Regards,<br>
Jules </font><br>
<br>
<div class="moz-cite-prefix">On 7/31/2020 10:26 AM, David Witten
wrote:<br>
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<div dir="ltr">Hyomin,
<div><br>
</div>
<div>I'm not certain what the next step should be. Julius is
hoping for further response from PNI on this subject. </div>
<div><br>
</div>
<div>If temperature compensation does account for the
differences in observed response I would think that the
important thing to do may be to find a way to calibrate out
the discrepancy. Then we can look at insulation to further
minimize the effect. </div>
<div>Calibration will hopefully give us more meaningful values
to begin with. </div>
<div>Insulation will dampen the effect of those behaviors over
short timespans.</div>
<div><br>
</div>
<div>Fortunately, neither requires changes in the basic circuit,
just adjustments to the data collection and device packaging.</div>
<div><br>
</div>
<div>Dave</div>
</div>
<br>
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<div dir="ltr" class="gmail_attr">On Fri, Jul 31, 2020 at 9:10
AM Kim, Hyomin <<a href="mailto:hmkim@njit.edu"
moz-do-not-send="true">hmkim@njit.edu</a>> wrote:<br>
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<div dir="ltr">Hi Dave
<div>Sorry that I've been out of the loop for a while as I
was completely caught up with something else. May I ask
you what the current status is? </div>
<div><br>
</div>
<div>I can visit Jenny Jump if there is something that I can
do. At this moment, I cannot think of anything that can be
fixed from my end. </div>
<div><br>
</div>
<div>If the temperature compensation is the issue, I could
install insulations around the sensor. </div>
<div><br>
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<div>Hyomin</div>
<div><br>
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style="color:rgb(111,111,111);font-size:13px">Hyomin Kim</strong><br>
<font color="#6f6f6f">Assistant
Professor</font><br>
<font color="#6f6f6f">Physics<br>
</font><font color="#666666">Center
for Solar-Terrestrial Research<br>
Institute for Space Weather
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<font color="#666666"><a
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104 Tiernan Hall, 161 Warren
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