The accuracy of measurement data is very important in the smart meter, but in the actual operation, the out of tolerance of measurement accuracy is one of the main faults of the smart meter, among which the faults mainly include:

    First, when there is voltage and current, the indication of the smart meter is not available, so it is necessary to eliminate it. It may be that the pulse is not connected, the circuit is not firmly connected, and there is faulty welding. The internal circuit should be checked one by one.

    Second, if the intelligent electric energy indicator is not displayed, the fault cause is still not found, so it is necessary to consider whether the electrical components are damaged. If the electrical components are damaged, the voltage and current cannot be normally provided.

    The third electrical element causes the metering indication error of the smart meter. Because the resistance in the smart meter is different, but they all play their own roles. The aging of the resistance will also affect the metering data of the smart meter. The fourth voltage and current are added, and other functions are normal, but the power is not included. This situation is generally caused by the failure of the CF pin of the metering chip to send the active power pulse signal to the MCU for processing.