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Why do I get very different magnetometer results from 3 FXOS8700 devices located side-by-side?

Question asked by Jonathan Guy on Jul 7, 2014
Latest reply on Jul 8, 2014 by Tomas Vaverka

I've got 3 FDRM-FXS-9AXIS boards mounted side-by-side, each with a unique I2C address.  I'd expect the magnetometer readings to be fairly close, but the raw results are very different.

 

Unit 1: X=355, Y=404, Z=370

Unit 2: X=510, Y=26, Z= 490

Unit 3: X=620, Y=-195, Z=150

 

They are taped in close proximity to each other on piece of abs plastic and held >12" away from any iron or substantial magnetic fields.  Changing the relative positions has no significant effect on the differences.

 

Is this expected?

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