1. Observe the flashing of the pulse indicator on the instrument panel.
Cut off the main switch of the distribution box or unplug all the appliances in the house. After confirming that there is no equipment power supply, observe whether the pulse indicator light on the electrical panel flashes. Usually, it does not blink or only flashes once in 10 minutes. The instrument works normally. If the indicator flashes several times, it means that the instrument is not working properly.
2, meter reading shows the total power, calculate and judge the peak and valley power.
The total power, peak power and valley power displayed by the instrument shall be recorded at the same time. When the sum of peak-valley power is equal to the total power, the instrument measures normally, otherwise it is abnormal.
3. Turn on the electrical equipment with relatively stable power supply and observe the measured value of the electric meter.
Turn off all electrical equipment in the home, record the degree displayed by the instrument, turn on the electric water heater or induction cooker for a period of time before turning it off, record the degree displayed by the instrument at this time, and then subtract two degrees from the power consumption of the newly turned-on equipment; Calculate the power consumption of the equipment according to the power indicated on the nameplate of the equipment, and compare it with the power recorded by the electric meter to determine whether the measurement of the electric meter is correct.
Extended data:
Electric meter principle
When the electric energy meter is connected to the circuit under test, alternating current flows in the current coil and the voltage coil, and these two alternating currents generate alternating magnetic flux in their iron cores respectively; The alternating magnetic flux passes through the aluminum disk and induces eddy current in the aluminum disk; The eddy current is forced in the magnetic field, which makes the aluminum disk gain torque (active torque) and rotate.
The greater the power consumed by the load, the greater the current flowing through the current coil, the greater the eddy current induced in the aluminum disk, and the greater the torque that makes the aluminum disk rotate. That is, the torque is proportional to the power consumed by the load. The greater the power, the greater the torque, and the faster the aluminum disk rotates. When the aluminum disk rotates, it is acted by the braking torque generated by the permanent magnet, which is opposite to the driving torque.
The braking torque is proportional to the rotating speed of aluminum plate, and the faster the rotating speed of aluminum plate, the greater the braking torque. When the active torque and braking torque reach a temporary balance, the aluminum disk will rotate at a uniform speed. The electric energy consumed by the load is proportional to the number of revolutions of the aluminum disk. When the aluminum plate rotates, it drives the counter to display the consumed electric energy.
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