... :DD862,DD862-4 50Hz,.,GB/T15283-1994IEC521.hour meter is a kind of induction meter.which is applicable to measure the rated frequency ... GB/T15283-1994 and lntermational standard IEC521.Structure feature: ,,,,.The meter has separable electromagnet and the bearing has four kinds;single ... ,conformed to IEC 62053-11 and GB/T15283 DD862 energy meter