Development and Uncertainty Evaluation of Calibration Testers for Low Frequency Field Strength

A new calibration method of field strength tester in low frequency range from 50Hz to 1 kHz are researched in this paper. It developed a parallel plate capacitor to calibrate standard electric field meter and magnetic field coils to calibrate magnetic field meter. In the end, it evaluates the uncertainty of electric field meter and magnetic field meter, the measurement uncertainty of electric field meter is 0.3dB and that of magnetic field meter is 0.ldB, which verify the practicality and effectiveness of this calibration method.