Abstract
In this paper, we present the establishment of a magnetic flux density standard in the national calibration laboratory in Croatia. A single-layer Helmholtz coil was constructed as a magnetic field source at frequencies from 25 Hz to 100 kHz to calibrate magnetic field meters up to field limits for occupational exposure. First, the calibration error margin was determined for probes up to 100 cm2 of the cross-sectional area with respect to the predefined calibration volume inside the coil. Next, the equivalent electrical model of the assembled standard was parameterized as a multiple resonance circuit to estimate the correction of the reference field with frequency. Finally, the calculated correction was experimentally verified using a single-turn induction loop with an amplifier. The resulting uncertainty budget of the standard confirms the laboratory's capability to calibrate environmental magnetometers with the best relative uncertainty of 0.8 %.
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