1.  AC input
1) Voltage range: AC 1~300V
2) Current range: AC 20mA-50A
3) Signal processing: special metering chip is adopted, and 24 bit AD is adopted.
4) Overload capacity: 1.2 times the range is sustainable; The instantaneous (<20ms) current is 5 times, the voltage is 1.2 times, and the range is not damaged.
5) Input impedance: voltage channel >1k Ω /v.

2. Communication interface
1) Interface type: 1-way RS-485 communication interface.
2) Communication protocol: MODBUS-RTU protocol.
3) Data format: software can set "n, 8,1", "E, 8,1", "O, 8,1", "n, 8,2".
4) Communication rate: the baud rate of RS-485 communication interface can be set to 9600, 19200, 38400bps; The baud rate defaults to 9600bps.

3. Test output data
Voltage, current, power, electric energy and other electrical parameters.

4. Measurement accuracy
Voltage, current and power: ± 1.0%; Active kwh is level 1.

5. Electrical isolation
RS-485 interface is isolated from AC power supply, voltage input and current input; Isolation withstand voltage 2000vac.

6. Power supply
1) Two power supply options: Power can be drawn from the C phase of the AC input (note that the voltage range is 85–265 V AC). Alternatively, DC power can be used, with an input range of +9 V to 15 V.
2) Typical power consumption: ≤ 1W.

7. Working environment
1) Working temperature: -20~+70 ℃; Storage temperature: -40~+85 ℃.
2) Relative humidity: 5~95%, no condensation (at 40 ℃).
3) Altitude: 0~3000 meters.
4) Environment: a place without explosion, corrosive gas and conductive dust, and without significant shaking, vibration and impact.

8. Temperature drift
≤100ppm/℃

9. Installation method
The distance between screw fixing and installation holes is 105*58.5mm

10. Product size
304*84mm