CALIBRATION OF A MEASURING DEVICE TO DETERMINE SPECIFIC SATURATION MAGNETIZATION BY A SPECIAL COIL

Michal Ulvr

   Specific saturation magnetization σ_S is an important parameter of ferromagnetic materials. It is in principle independent of the structure and shape of the sample. There are two ways to calibrate devices for determining $\sigma_S$: the standard method, using a calibrated magnetic moment standard, or an alternative method, using a special moment coil. This paper presents a calibration method used at Czech Metrology Institute for calibration of Koerzimat 1.096 using a special moment coil. Special attention is given to a description of the special moment coils used for Koerzimat 1.096 calibration, and to analysis of sources of uncertainty. Calibration expanded uncertainty of 0.4 up to 0.6 % can be achieved using this method.

Keywords: calibration, magnetic moment, magnetic moment standard, moment coil, saturation magnetization

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