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The full material characteristics in the Preisach model of hysteresis is a two-dimensional weighting function. It can be determined experimentally from systematic measurement of partial hysteresis loops followed by derivation of their decreasing parts. Because of measurement errors, the derivation is not correct. Nevertheless, basic material features can be obtained either from incomplete measurement that uses the Preisach triangle respecting the measurement errors. The non-uniform grid in the Preisach model is used in order to get approximately the same steps in changes of the flux density. Simulation shows that this withdrawal of some rows and columns does not change the hysteresis loop considerably, only the steps of the flux density may be higher.

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