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Overview:DDSYF 127 single phase multi-tariff prepayment meter is a meter integrated with prepayment function unit and multi-tariff function unit. This meter supports 4 tariff and 12 tariff period. It features high reliability, strong structure and convenient meter reading. It is a new generation of meter which is very practical for commercial application or in some temporary electricity-using places. The meter is equipped with pulse output (optical) and can be read by TTU. Main function: *Measure positive and negative active energy for 4 different tariffs.*Max 4 tariffs, 12 tariff periods.*Read and program meter via optical port by TTU*Display parameters of max 14 items in circulation, the order and time interval of display is programmable.*Record last 12 months' total active energy and active     energy in  each tariff period.*Purchase before use*Automatically store data of energy consumption at preset day.*Program parameters via IC card*Large-capacity reading meter data(max 169 meters' consumption data can be read by one special card)* Cut off power supply when overload*Set emergency credit and friendly period for customer convenience*Internal audible & visible alarm, switch-off relay (external alarm output is optional)* Instantaneous load measurement*Malfunction self-detection (include load switch, EEPROM, IC card data)* Large-screen LCD display Technical data: Standard: comply with GB/T17215-2002,GB/T18460-2001,GB/T15284-2002,IEC 62053-21,DL/T645-1997.Accuracy: class 1.0,2.0Reference voltage: 120V, 220V,240VReference frequency: 50Hz, 60HzCurrent:2.5(10)A,5(20)A,10(40)A,15(60)A,20(80)AOperate voltage range:0.8Un~1.15UnOperate temperature range:-25~+55Circuit power consumption: voltage circuit power consumption<=3W/12VA, current circuit Power consumption <=4VA.