The model 2650 is capable of precisely measuring the magnetic field distribution on a LSI or a printed circuit board using magnetic field probe PR 26M. As the magnetic field detection portion of PR 26M is of a shielded loop structure that adopts glass ceramic multi-layer board technology of excellent high frequency characteristics, it is possible to take a measurement at high reproducibility by detecting magnetic field components only. The measuring frequency range is a broad as 10MHz to 3GHz, and the measured value is calibrated in the instrument.