1、 Overview
DDSF1768Single phase tiered electricity price multi rate time of use meterSingle phase cost control intelligent energy meter）Designed with advanced microcontroller processing system, it has the advantages of simple circuit, high reliability, and low cost. The software, hardware, and structural design technology of this product are advanced, with high measurement accuracy. Combined with microcontroller resources, it realizes time-sharing measurement of electrical energy and has infrared andRS-485Communication function, good anti-interference and anti attack performance, wide working temperature range, and long-term stable and reliable operation. The performance indicators of this product comply with the national standardsGB/T 17215-2002《1Level and2Static AC Active Energy Meter、GB/T 15284-2002The Multiple Rate(time-sharing)Special Requirements for Electric Energy MetersDL/T 645-1997Technical requirements of standards such as the Communication Protocol for Multi functional Energy Meters.

2、 Working principle

The electric energy metering pulse is sent to the CPU for processing through a photoelectric coupler, and after calculation, it is processed according toPeak, flat, and valley respectivelyStored in memory; And communicate with the outside world through infrared and RS485 interfaces; The clock is a hard clock to ensure the accuracy of time.

3、 Main functions

（1） It has the function of measuring positive and negative active energy. Negative energy is accumulated based on positive energy, but it is still stored separately. Whether it is communication, time period switching, or switching between positive and negative active energy, it will not affect the accuracy of pulse accumulation.
（2） Can be carried out4Planting rates (peak, flat, valley)8The time period setting can cross zero, and the time period status will not be affected by power outages, power transmission, or other harsh working environments.
（3） Electric energy is measured and stored separately based on peak, off peak, off peak, off peak, and off peak electricity levels, as well as total electricity levels and reverse total, peak, off peak, off peak, and off peak electricity levels.
（4） Before being stored in the electric meter12Freeze data for months, including sharp, peak, flat, and valley data. The freezing date for electric energy data is every month1-28At any time of the day, it defaults to monthly1sun00：00.
（5） The battery adopts a needle welded backup green and environmentally friendly lithium battery. After power failure, the backup lithium battery can continuously provide the built-in clock with normal operation10Year.
（6） Can be achieved through infrared andRS-485The communication interface completes programming and meter reading operations.
（7） The electricity meter has an active energy indicator light and an energy pulse output.
（8） The electricity meter adoptsLCDThe display method can display parameters such as time, date, and battery level, and allows setting the display time and content (please refer to the appendix for specific details). The number of digits displayed for electric energy is6Bit integer,1Decimal places. The default setting is full display, and the display time for each item is5s.
（9） The electricity meter adopts a hardware clock circuit. The built-in clock has calendar timing and automatic switching function for leap years;
（10）After power failure, all stored data will not be lost and can be maintained10Years or more. Repeated power outages and power ups will not result in any changes to the battery level or pulse count.
（11）Event recording function: capable of measuring maximum demand and occurrence time; Record the time and frequency of programming, as well as the time and frequency of power outages.
（12）Equipped with power outage display function, wide temperature and wide screen LCD display.
(13)haveThe clock detection output port function facilitates regular testing of clock accuracy.

4、 Main technical parameters
（1）Reference voltage:220V
（2）Reference current: 2.5（10）A 5（20）A 10（40）A 20（80）A
（3）Reference frequency:50Hz
（4）Accuracy level: 1.0level
（5）Pulse constant: (See nameplate annotation)
（6）Daily timing error: ≤0.5s/d（25℃±2℃）
（7）Service life: ≥10year
（8）Battery capacity:1000mAh
（9）Infrared communication distance:5mThe angle of light radiation is less than15Degree)
（10）RS485Bus terminal:256individual,Communication baud rate:1200bps～2400bps
（11）Starting current: The meter operates at rated voltage, rated frequency, and power0.004Ib
（12）Submersion: When there is no current in the circuit of an electric meter and the voltage applied to the circuit is at the rated value115%When, the output pulse should not exceed one.

5、 Electrical parameters

（1） Normal operating voltage:0.9---1.1rated voltage
（2） Maximum operating voltage:0.75--1.15rated voltage

（3） Power consumption: less than2W、6VA

6、 Climate conditions and temperature range

（1） Normal operating temperature:-10℃---45℃
（2） Extreme working temperature:-25℃---55℃
（3） Storage and transportation temperature:-25℃---70℃
（4） Annual average relative humidity: less than85%

7、 External dimensions and weight

（1）External dimensions:155 ×129 ×62mm
（2）Net weight:make an appointment0.7kg