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problem about Seven-Parameter Magnetic Calibration Model

Question asked by pengcheng li on Jun 12, 2016
Latest reply on Jun 21, 2016 by Mark Pedley

Hi all, in application note AN5019, section 5.4(Inverse Soft-iron Matrix), formula(93), what if one of beta is negative? Then perform the sqrt is not allowable.

We make beta_0*beta_1*beta_2 to be positive in section 5.2, but we can not make sure beta_0,beta_1 and beta_2 all be positive, right?

What am I missing?