4) Accuracy: Active Class 1.0, Active Class 2.0; Reactive Class 2.0
5) Deviation of RTC: ≤0.5s/D (23±3^oC)
6) Ambient working temperature:-20~+55^oC, the limited temperature:-20~+70^oC

7) Infrared output: the communication protocol conforms to DL/T645-1997

8) Carrier wave communication port: it can set and read meter and realize carrier wave output

9) Pulse output optical couple, two circuits:
    a) External voltage: 5-24VDC
    b) Load current: 10-20mA
    c) Width of pulse: ≥80mS
Functions:
1) Energy measuring: measures active total, peak, shoulder, trough and reactive total
    energy for current and last month(accumulation of positive and negative)
2) Measures and displays real-time active power, and can be read out
3) Has function of overload slip brake. Load value can be set. It will be power on    
    automatically after power off for 5 minutes
4) Built-in relay and MODEM: can realize local or distance remote power on and power
    off
5) Records the time of power on and power off for last time
6) Has carrier wave port to realize functions of remote meter reading, meter setting,
    closing and opening relay to be power on and power off remotely
7) Has infrared port to realize functions of local meter reading and setting
8) Realizes tamper proof functions by methods of reversing, crossing wire and
    connecting one fire wire with one earth wire, and records the starting and ending
    time for last 3 times
9) Records and alarms when case and terminal box is opened, and records the time of
    opening and closing case and terminal box for last 3 times
10) LCD display has functions of automatic circle display, and the display contents, 
     display time and stopping time for each data can be set

Single Phase Multi-Tariff Carrier Wave Energy Meter