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    BMX055 Accelerometer Calibration

    Occasional Visitor

    BMX055 Accelerometer Calibration

    This device produces readings in G, but G is not a constant value over the surface of the earth. What value of G, in m/s2, is represented by an output value of unity? Is 1G the value of the earth's gravitational field at the location at which the device is calibrated, or is it calibrated in m/s2 and 1G represents a constant, such as 9.81m/s2?

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    3 REPLIES 3
    Community Moderator

    Re: BMX055 Accelerometer Calibration

    The sensor refers to the 1g value of the location where the last calibration was performed. For most applications, the slight difference in g values at different locations doesn’t influence the application performance.

    dym
    New Poster

    Re: BMX055 Accelerometer Calibration

    Hi handytech, what do you mean by "the last calibration"? We're quite interested in very precise gravity measurements that require using our locally estimated gravitational acceleration. Can we redo this calibration or is it only done at the factory? Is it possible to read out the stored constant or at least know what is used inside the sensors?

    Community Moderator
    Community Moderator

    Re: BMX055 Accelerometer Calibration

    Hi dym, the accelerometer inside BMX055 isn't remotely close to be accurate enough so that this has an impact.

    In any case if you want a the most precise measurement possible, you should re-calibrate the offset after soldering. We have an application note on this https://ae-bst.resource.bosch.com/media/_tech/media/application_notes/BST-MAS-AN030.pdf
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