Comparison of two averaging methods for improving the measurement accuracy of power loss

When the magnetic characteristic of amorphous magnetic materials is measured by an SST, the induced voltages of the H-coil are small compared to the noise. In order to decrease the noise effect on the power loss measurement, hundreds of averaging of the measured values are effective. As the induced voltages are input to a computer through A/D converters, usually the instantaneous values of these data are averaged, and finally the power loss is calculated. Another averaging method is compared with the method mentioned above. The power loss is calculated at every measurement, and hundreds of measured power losses are averaged. When a transmission method of A/D converter is added, the second method is superior to the first method.