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Lena/Sep 2016: Difference between revisions
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→Issues with the 32-bit magnetometer
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=== Issues with the 32-bit magnetometer ===
* '''[FIXED]''' 16-bit and 32-bit versions return substantially different (20-50%) magnetic field response to both Y and Z fields in Z-mode, although the sensor conditions are the same. 32-bit version reports increased gain for the Y signals, and decreased gain for the X signals
* The op-amp phase response rolls for 32-bit version for about 30 degrees in 0-200 Hz; the phase is flat in the 16-bit version. The phase behavior could be caused by a 0.5ms delay between the reference data and the input data.
* '''[FIXED]''' The op-amp response: phase at zero frequency is flipped by 180 degrees in 32 bit version
* Calibration chirps are cropped too much in the beginning
* Sometimes the subsequent calibration chirps come out at different DC levels. The magnetometer output looks like there is a sudden field jump between the chirps. Sometimes the jumps are larger than the magnetometer range. The jumps seem to be bigger when the field is not completely zeroed. '''Both 16-bit and 32-bit versions do that.'''
* '''[FIXED]''' Calibration chirps go too far out in the frequency domain and reach 1kHz, the modulation frequency. This causes the X field to not be demodulated incorrectly. '''Both 16-bit and 32-bit versions do that.'''
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