[TangerineSDR] Mag update?

[David G. McGaw]

Interesting, this, as it says on the RM3100 webpage "Measurements are 
stable over temperature and inherently free of offset drift" and a 
temperature coefficient is not even mentioned in the specs.

David N1HAC

On 7/31/20 11:18 AM, Julius Madey via TangerineSDR wrote:
> 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.
>
> 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.
>
> 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.
>
> Regards,
> Jules
>
> On 7/31/2020 10:26 AM, David Witten wrote:
>> Hyomin,
>>
>> I'm not certain what the next step should be.  Julius is hoping for 
>> further response from PNI on this subject.
>>
>> 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.
>> Calibration will hopefully give us more meaningful values to begin with.
>> Insulation will dampen the effect of those behaviors over short 
>> timespans.
>>
>> Fortunately, neither requires changes in the basic circuit, just 
>> adjustments to the data collection and device packaging.
>>
>> Dave
>>
>> On Fri, Jul 31, 2020 at 9:10 AM Kim, Hyomin <hmkim at njit.edu 
>> <mailto:hmkim at njit.edu>> wrote:
>>
>>     Hi Dave
>>     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?
>>
>>     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.
>>
>>     If the temperature compensation is the issue, I could install
>>     insulations around the sensor.
>>
>>     Hyomin
>>
>>
>>
>>     NJIT logo
>>     <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.njit.edu%2F&data=02%7C01%7CDavid.G.McGaw%40dartmouth.edu%7C2e59f624469544810c1c08d8356521e1%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637318055785489421&sdata=TmqWJw6VYdRSrTgS2xSIifG4OTUj6z5lcBLqd2UedyY%3D&reserved=0>
>>     	*Hyomin Kim*
>>     Assistant Professor
>>     Physics
>>     Center for Solar-Terrestrial Research
>>     Institute for Space Weather Sciences
>>     hmkim at njit.edu <mailto:hmkim at njit.edu> • (973) 596-5704
>>     https://web.njit.edu/~hmkim/
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>>
>
>

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