FIELD: measurement technology. SUBSTANCE: sample for calibration of magnetically noisy device has cruciform shape and is produced from checked article having loading-gripping parts and central working part with zones of localization of deformations in the form of crossing grooves. Central working part of sample carries concentrator in the form of recession having shape of truncated cone facing working surface of sample with small base. Axes of grooves are placed at angle 45 deg towards axes of loading parts of sample. Grooves have variable depth with curvilinear generatrix running along bottom of groove. Maximum depth of groove is equal to height of truncated cone. Width of groove is determined from relation b=(0.25-0.75)d, where b is width of groove; d is diameter of small base of truncated cone. EFFECT: increased precision of calibration. 5 dwg
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