A thin wafer of semiconductor material used for measuring ac power and magnetic fieldstrength.Its output voltage is proportional to the current passing through it times the magnetic field perpendicular to it.

• 用来测量交流功率和磁场强度的一种半导体材料薄片（亦称大圆片），其输出电压与通过它的电流及与其垂直的磁场强度的乘积成正比。