In order to measure the pulsed magnetic field in the process of HEMP simulator construction and the effect study

a magnetic field measuring system for fast risetime pulses is developed and the procedure of the design and calibration are introduced in this paper. First

the measurement principle and frequency characteristics of an electrically small loop antenna are presented. Then the receiving characteristics of the antenna are simulated numerically to determine the proper parameters of the B-dot sensor. A circuit model is also developed to simulate the performance of the sensor. At last

along with the integrator and optical fiber transmission system

the magnetic field measuring system with a designed B-dot sensor is developed

and the system is calibrated and applied. The results show that the risetime of the measuring system is less than 1 ns and the dynamic range is wide enough for HEMP measurement.