a high frequency magnetic properties measuring system is used for measurement of high frequency magnetic properties , for example high frequency core - loss and magnetic hysteresis curve in soft magnetic materials such as ferrites , permalloy and amorphous magnetic cores used in inductors , transformers and filters of various electric and electromagnetic systems and devices such as computers and multimedia devices . a digital oscilloscope is operated as a waveform detection unit for measuring magnetic fields and magnetic flux density . a signal generator and a power amplifier are operated as a signal input unit . the digital oscilloscope and the signal generator are remotely controlled through a general purpose interface bus by the computer . the high frequency magnetic properties are measured by remote control and the resulting data can be outputted and stored by the computer . when measuring the high frequency signal , the core - loss can be analyzed by applying suitable waveforms .