LIS3MDL负磁场的高非线性

大家好，


我正在测试一块使用LIS3MDL作为磁性参考传感器与3线SPI通信的电路板。我正在使用我制造的亥姆霍兹线圈测试传感器（顺便说一下，已经过测试并正确生成了磁场）。

当从LIS3MDL读取磁数据时，我看到磁数据正确地跟踪产生的磁场以获得正磁场。然而，负磁场未被正确测量并且在Breal对B测量的图中显示出不同的斜率。测量中的这个误差远远高于该器件预期的+ -0.12％非线性。

我测试了三个原型板，所有这些都有这个问题。我研究了来自传感器的原始二进制数据，我已经放弃了从二进制到高斯错误的任何转换。

最后，我的问题是：这种表现是否正常？三个传感器是否以同样的方式损坏？有没有人有同样的问题？我应该放弃并使用它吗？

谢谢！
#spi



以下为原文




Hi all,


I am testing a board that uses a LIS3MDL as a magnetic reference sensor communicating with a 3-wire SPI. I am testing the sensor using a Helmholtz coil that I built (that, by the way, has been tested and generates correctly the magnetic field).  

When reading the magnetic data from the LIS3MDL I see that magnetic data tracks correctly the generated magnetic field for positive fields. However, negative magnetic fields are not correctly measured and show a different slope in a Breal vs B measured plot. This error in the measurement is far higher than the +-0.12% nonlinearity expected from this device.

I have tested three prototype boards and all of them have this issue. I have studied the raw binary data coming from the sensor and I have discarded any conversion from binary to Gauss error.

So finally, my question is: Is this performance normal? Are the three sensors damaged in the same way? Has anybody had the same problem? Should I give up and work with it?

Thanks!  
#spi