... ISO9001,14001,IEC 4)OEM GeneralDDSI726 single-phase carrier electronic watt-hour meter is made by the advanced energy metering ... international advanced level,the performance indicators of this type of watt-hour meters comply with the technical requirements stipulated in ... classes 1 and 2) and DL/T645-2007 Multi-function watt-hour meter communication Protocol. Function and features2.1 Can realize ...