詳細介紹(introduction)：

    DDSF879系列電子式單相多費率電能表是我廠為滿足市場需求而研制開發的計量新產品，該產品采用國外的電能計量芯片、的CPU、RTC時鐘芯片、顯示器（計度器）以及T工藝制造。其特點是對電量能根據不同時段分別計量，具有四費率、十二時段、竊電、高、高性、高過載、低功耗、重量輕等優點。尖、峰、平、谷費率及各時段可按需要設定。

    電能表采用濾波網絡，具有較強的干擾能力。

    本產品采用標準GB/T 17215-2002《1級和2級靜止式交流有功電能表》、GB/T 15284-2002《多費率電能表 要求》、電力行業標準DL/T 614-1997《多功能電能表》等。電能表具有紅外通信口和RS485通信口，通信規約合電力行業標準DL/T 645-1997　《多功能電能表通信規約》。生產本產品的質量管理體系通過了GB/T 19001(ISO9001)。

    供電部門可利用的編程器通過紅外或RS485接口設置費率時段、時間日期、編　　程等等內容；通過的抄表器讀取電能表上除外的各種信息，并在合法授權　　下進行對時。紅外通信距離不小于 4米 ,通信角度不小于15°。抄表器可將數給計算機。用戶可根據需要選配EIA-RS485接口。

　　注：其中LCD液晶顯示的載波多費率電能表具有電力線載波抄表、遠程負荷控制的功能。

　　結 構：

　　■ 表殼采用密封塵結構，阻燃、老化。
　　■ 具有紅外通信口和RS485通信口。
　　■ 1只紅色LED燈指示電量脈沖，電表每累計一個脈沖當量的電能時，脈沖燈閃爍。
　　■ 一路光耦隔離脈沖輸出，輸出寬度約為80ms，供校驗使用。
　　■ 采用長壽命、亮度LED燈作時段指示。
　　■ 電量顯示采用雙計度器、LCD液晶顯示和LED數碼管顯示三種形式。在正常使用條件下，其顯示器的壽命大于10年。
　　■ 工作電源采用變壓器隔離。
　　■ 在電表內有編程控制開關，在接線端子塊上裝有電量脈沖輸出口和RS485接口。

　　技術參數：

　　■ 額定電壓(V)：220，230
　　■ 工作電壓范圍：70%Un～120%Un
　　■ 額定電流(A)：5(20) , 5(30), 5(50),10(40), 10(60) ,15 (60) ,15(90),20(80) ,10(100)
　　■ 額定頻率(Hz)：50，60
　　■ 準確度等級：1級，2級
　　■ 功耗：電壓回路≤2W，10VA；電流回路≤1VA
　　■ 工作溫度(℃)：-25～+55，限工作溫度(℃)：-45～+70
　　■ 相對濕度：≤75%（年平均）
　　■ 費率：二/三/四種費率可選；時段：≥8
　　■ 時鐘：0.5s/d( 23℃ )，隨溫度變化改變量0.1s/ (d·℃)
　　■ 電池容量（Ah）：≥1Ah,維持時鐘正常工作不少于10年
　　■ 外形尺寸（mm）：（LCD、LED顯示）；（雙計度器顯示）。
    ■ 平均使用壽命（年）：＞10

   功 能

　　■ 計量正、反向有功電能，反向電能按正向累計。
　　■ 電能量按總、尖、峰、平、谷分別累計和存儲。
　　■ 具有自動抄表功能,指定每月某天的任一整點為抄表時間,能儲存12個月的歷史電量。
　　■ 日歷、計時和閏年自動切換。
　　■ 能按用戶要求顯示日期、時間、費率、電量等各種參數。

　　適用范圍：

　　■ 220V 5(20)A----10(100)A為直接接入式儀表，適用于實施分時計價的城、鄉居民照明計費用表。

DDSF879 Static Single-phase Multi-rate Watt-hour Meter (Double-counter/LED/LCD /LCD with PLC)
Main Features
■ Adopting special filtering network with strong anti-jamming ability
■ Adopting most advanced measurement chip, high-accuracy CPU, RTC and displayer
■ Manufactured with advanced T process
■ Measuring energy in different time segments respectively with 12 time segments and four tariffs (sharp/peak/ shoulder/off peak) programmable
■ Excellent anti- tamper & fraud function
■ Reliable function, high precision, high overload, Low self-consumption, light weight
■ Setting time segment, clock, pwords and other information by special programming device through RS485 or infrared interface.
■ Read all kinds of information except pwords by special reader and check the time when legally authorized
■ Distance of infrared communication can be more than 4 meters and communication angle be more than 15°
■ The reader can transfer the data to a computer
■ EIA-RS 485 interface can be added as per user.
■ The PLC meter with LCD have the function of PLC reading and remote load management
■ With RS485 and infrared communication interface whose communication protocol meeting DL/T645-1997 on multi-function Watt-hour meter communication protocol
■ Meeting standard GB/T17215-2002 (IEC61036: 2000) on “Alternating current static Watt-hour meters for active energy (cles 1 and 2)”,GB/T on particular requirement for multi-rate electricity meters and DL/T 614-1997 on multi-function Watt-hour meter
■Ped JQAC certificate according to GB/T19001 (ISO9001) Structure
■ With sealed case of flame-retardant、rust-proof and anti-aging
■ With RS485 and infrared communication interfaces.
■ Red LED indicating power pulse and flashing once per pulse
■ One channel of optical pulse output for calibration with width of about 80ms
■ Long-life & -bright LED indicating time segments
■ Under normal conditions, the life of displayer( register、LED or LCD can be selected) is more than 10 years.
■ Working power supply is isolated by transformer
■ With program control switch within the meter
■ Having energy pulse output interface and RS484 interface on terminal block.
Technical Parameters
■ Rated Voltage(V) : 220，230
■ Operation Voltage (v): 70%Un~120%Un
■ Rated Current (A): 5(20), 5(30), 5(50), 10(40), 10(60), 15(60), 15(90), 20(80), 10(100)
■ Rated Frequency(Hz):50，60
■ Accuracy: cl1, cl2
■ Power Consumption: voltage circuit:≤2W/10VA; current circuit:≤1VA
■ Ambient Temperature(℃): -25~+55，limits of temperature(℃)：-45~+70
■ Relative Humidity:≤75%（annual average）
■ Tariff Selection: two/three/four tariffs ; time Segment:≥8
■ Accuracy of Clock: 0.5s/d(23℃)and variation with respects to temperature is better than 0.1s/(d·℃)
■ Capability of Battery: ≥1Ah(keep clock working for more than 10 years)
■ Size(mm):（LCD/LED）；（double- counter）
■ Life(year):＞10
Function
■ Measuring positive & negative active energy with negative energy accumulated into positive energy
■ Separately accumulating and storing the energy of each tariff (sharp/peak/ shoulder/off peak of the power)
■ Read automatically at any integral time of day in a month and can store total energy of 12 months
■ Able to show calendar, check time and make automatic adjustment in leap year
■ Displaying date, time, tariff, energy quantity and other parameters as per customers
Scope of Use
■ 220V 5(20) A----10 (100)A is for direct connected meters suitable for residential energy measurement (energy charged by multi-tariff) at urban or rural areas.