Calibration of magnetic field meters up to 50 kHz at CMI
Michal Ulvr
Abstract:
This paper presents a calibration method with a special search coil used at the Czech Metrology Institute (CMI) for calibration of AC magnetic field meters in the range of frequencies up to 50 kHz. Special attention is given a) to the construction of magnetic flux density standards, which are used for generating the AC magnetic flux density for frequencies up to 3 kHz and for the frequency range from 3 kHz up to 50 kHz, b) to a description of special search coils used for precise measurements of the generated AC magnetic flux density, and c) to the analysis of sources of uncertainty. Calibration expanded uncertainty of (0.4 up to 0.8) % for k = 2 can be achieved by this calibration method.
Keywords:
calibration, Helmholtz coils, magnetic field measurements, search coils, solenoid
