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<font face="Arial">One more thought. I've asked PNI for information
both on temperature and supply voltage sensitivity, the only two
variables I could think of besides the need to minimize local B
fields due to currents in circuit board traces, nearby wiring,
etc. <br>
<br>
I did not find data on the temperature stability of the 3.3 volt
regulator Dave's JJ board is using but the regulator I used with
the original adapter board Dave sent me has about 5 millivolts of
change out of 3.3 volts between 25 and 50 C and Dave's is probably
similar. That doesn't seem like enough change to produce the
observed variations but that information was given to PNI as well.<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 7/31/2020 10:26 AM, David Witten
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABJ3BVMweyCCiXQQB-twSDwH4hQU-U0VEzRgHvYHSwW2Owfmbw@mail.gmail.com">
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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>
<div class="gmail_quote">
<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>
</div>
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0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<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>
</div>
<div>Hyomin</div>
<div><br>
</div>
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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
Sciences</font><br>
<font color="#666666"><a
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target="_blank"
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<a
href="https://web.njit.edu/~hmkim/"
target="_blank"
moz-do-not-send="true">https://web.njit.edu/~hmkim/</a><br>
104 Tiernan Hall, 161 Warren
Street, Newark, NJ 07102<br>
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