一、引言7500H 型8时(203.2mm)磁盘 BH 曲线测试仪是由美国 LDJ 公司生产的,它是该公司生产的同类型仪器中励磁线圈功率较大的一种,原则上可以测量8时及小于8时的磁盘及磁粉等材料的有关参数,但由于驱动功率较大给仪器的冷却和稳定性带来了一些问 I. Introduction 7500H type 8 (203.2mm) BH curve tester is produced by the United States LDJ company, which is produced by the company of the same type of excitation coil power of a larger, in principle, can measure 8 o’clock and Less than 8 when the magnetic disk and other materials related parameters, but because of the larger drive power to the cooling and stability of the instrument brought some questions