NOTE 1 The accelerometer method [5] is also an established method for the measurement of magnetostriction. However, it is more suited to the measurement of magnetostriction under an externally applied tensile or compressive stress, not zero stress, because it places a weight on the test specimen to prevent a deformation of the test specimen. Since this document includes the measurement at zero stress, the optical sensor method is provided as the optimum method.

NOTE 2 Throughout this document the term “magnetic polarization” is used as described in IEC 60050‑121:1998, 121‑11‑54. In some standards of the IEC 60404 series, the term “magnetic flux density” is used.