FIELD: electrical measurements. SUBSTANCE: invention refers specifically to measurement of heavy currents utilized in chemical and metallurgical industries. Measurement elements are positioned over circumference of package of busses while calibrating instrument converters. When computing magnetic induction in point of location of each element package of busses is replaced with line conductor. Number of measurement elements is chosen from series n=7+4m, where m=0,1,2,.... EFFECT: raised accuracy of calibration of instrument converters. 2 cl, 4 dwg _
