1. Select the voltage parameter of the energy meter according to the working voltage of the electrical appliance. If the electrical appliances in the circuit all use 220V power supply, choose an energy meter with a nominal voltage of 220V, otherwise, choose an energy meter with a nominal voltage of 380V.

2. The choice of current parameters depends on the size of the circuit load. The load of the circuit can be calculated according to the total power of the electrical appliances in the circuit (I=Ptotal/U). With the continuous improvement of living standards, the number of household appliances, especially high-power household appliances, continues to increase. When choosing the current parameters of the energy meter, there should be room to allow normal use when adding high-power appliances in the future.

3. Use the metering parameters of the electric energy meter to measure the actual power of the electrical appliance. Take the measurement parameters of the induction energy meter as an example to measure the actual power. The measurement parameter xxxr/kWh indicates that for each 1kWh of electrical energy consumed by the electrical appliance, the aluminum turntable of the energy meter must be rotated through xxx revolutions. Turn off the other electrical appliances in the circuit and only allow the electrical appliances under test to work. Remember the time t used by the aluminum turntable to turn the number of revolutions n (in order to ensure accuracy, generally n=20=30 is appropriate), then the electrical appliance is in The power consumed during time t is nkWh/xxx. The power can be obtained according to P=W/t, P=W/t=nkWh/xxxt. It should be pointed out that the unit should be unified. If the electrical energy uses kWh as the unit, the time unit is h; if the electrical energy uses J as the unit, the time unit uses s.

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