Is your electric meter accurate?
The watt-hour meter is a statutory special instrument for monitoring the power consumption. The country has a specified time limit for the calibration of the watt-hour meter, and the power supply department should ensure the accuracy of the watt-hour meter. Due to various reasons, the power supply department is still unable to undertake this responsibility. Is there any way to estimate whether the meter is accurate? Now only take the electric meter as an example, the dial is marked with "1950r/kwh", which means that the dial rotates 1950 revolutions for every 1 kilowatt-hour of electricity used. From this calculation, if the electric power is 100 watts for 2 minutes, the dial should rotate 6 and a half times, and 13 times should be rotated in 4 minutes. According to national regulations, the tolerance for civilian electric meters is 2%. As long as this error is not exceeded
It means that the meter is accurate. For different types of meters, the dial rotation number "r/kwh" per kilowatt-hour is different, and there are marks on the dial. Based on the number of rotations of the electric dial per degree and converted according to the above method, it is not difficult to judge whether the electric meter is accurate.
It is worth mentioning that the electrical appliances selected by the user when judging the conversion should be of the line resistance type, such as incandescent lamps, electric irons, etc., and temporarily disable other electrical appliances. Any electrical appliance with a motor is not suitable for inspection, because the starting current of the motor is variable and it is inconvenient to calculate. Mastering the above-mentioned checking calculation method is good for alleviating the pressure of meter calibration in the power supply department and the worries of users.
