magnetic calibration

[mbui0327]

Hi Kris, for 8-shape magnetic calibration. Do i need to move in 8-shape for all three dimensions (x, y, z)?
This what happens when I did on all directions on my chip. I am using uT units. And does it has to be around 0 like what you have done. Thank you very much.

[kriswiner]

Yes all three directions, really over all possible directions over the entire 3D response surface.

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On Fri, Oct 12, 2018 at 10:16 AM robotdreamers ***@***.***> wrote: Hi Kris, for 8-shape magnetic calibration. Do i need to move in 8-shape for all three dimensions (x, y, z)? This what happens when I did on all directions on my chip. I am using uT units. And does it has to be around 0 like what you have done. Thank you very much. [image: image] <https://user-images.githubusercontent.com/34329345/46883674-ab5ea680-ce07-11e8-8ae1-76dd3361ccaa.png> — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#37>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGY1qmUAJNSGkVQ98ziC1uyvEbSoh1wUks5ukM6CgaJpZM4XZ3Zo> .

[mbui0327]

Does the well calibrated chip should produce the mag value nicely around point 0.0 when it stays still?

[kriswiner]

No, it will produce values consistent with the local magnetic field at your location, which you can look up and compare. For example, in my part of California, Mz should be -450 mG.

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On Fri, Oct 12, 2018 at 10:23 AM robotdreamers ***@***.***> wrote: Does the well calibrated chip should produce the mag value nicely around point 0.0 when it stays still? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#37 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGY1qiUKSWeA_3e6TZy4Q34UP3Xll8Xlks5ukNAPgaJpZM4XZ3Zo> .

[mbui0327]

I my location it looks like this, does it mean mZ = 480mG. what can I tell about mX and mY. Thanks.

[kriswiner]

It means SQRT(Mx**2 + My**2 + Mz**2) ~ 480 mG, as expected. Look at the USGS for local field in your area, probably not too different from Danville, California.

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On Fri, Oct 12, 2018 at 10:58 AM robotdreamers ***@***.***> wrote: I my location it looks like this, does it mean mZ = 480mG. what can I tell about mX and mY. Thanks. [image: screen shot 2018-10-12 at 10 56 20 am] <https://user-images.githubusercontent.com/34329345/46885674-85d49b80-ce0d-11e8-8f49-d6858855e994.png> — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#37 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGY1qkSDf9ErzhDPE19DYXUB7w3WgAwIks5ukNhZgaJpZM4XZ3Zo> .

[mbui0327]

so how should I read this :). so many jargons for an amateur :(

[kriswiner]

Huh? 227 mG, 54 mG, 420 mG is this what your mag shows?

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On Fri, Oct 12, 2018 at 11:10 AM robotdreamers ***@***.***> wrote: so how should I read this :). so many jargons for an amateur :( [image: screen shot 2018-10-12 at 11 07 51 am] <https://user-images.githubusercontent.com/34329345/46886284-5161df00-ce0f-11e8-946c-bbf39186a73b.png> — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#37 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGY1qoxQq0DlTCZz0c9RE9PS3kEMRhGpks5ukNr5gaJpZM4XZ3Zo> .

[mbui0327]

No i got from this website for my location: https://www.ngdc.noaa.gov/geomag-web/#igrfwmm

[mbui0327]

ah so I am supposed I should expect: mX to be 227mG, mY 54mG and mZ 419mG.