... can be measured .3.Comprise:The system is composed an electromagent ,an electromagnet power supply,a fluxmeter,a gaussmeter, a ... a Helmholtz coil ,an impedance tester,an audio frequency power supply ,a data acquisition system ,a pressure bag,a computer ... printer.4.Running conditions:About the measurement system,the input voltage of wire system ,the line voltage is 380V,the maximum output DC voltage ...