How meter readings are calculated

The meter reading is calculated as = (stop code - start code) x multiplier.

For the traditional mechanical meter, directly from the reading window to read the amount of electricity can be read, the reading from front to back are: thousands, hundreds, tens, digits, the back of the red part of the decimal point behind the value, see the meter reading is usually not calculated. Because the meter display reading device is a cumulative counter, now see this value is the meter enabled to the current period of time all the electricity consumption.

Note that the reading should be used for meters in residential buildings (direct-access meters), while sometimes the meter is connected to the power line through a current transformer, and thus the reading should be multiplied by the ratio of the current transformer, Ki (that is, the multiplier, which is indicated on the transformer).

Expanded information:

Precautions:

1, there is an ac Magnetic field exists, the metal cover shell induced current is a normal phenomenon, will not consume electricity, and does not affect the safety and correct measurement. If the shell is charged for other reasons, you should try to exclude, to ensure safety.

2, the meter works with some slight rattling, will not damage the components, does not affect the service life, and will not hinder the accuracy of measurement.

3, the power meter monthly power consumption of about 1 kW-h (degrees), so if used as a sub-meter, should be 1kW-h per month to the total meter subsidies, to the total meter subsidies to the amount of electricity with the sub-meter has nothing to do with the amount of electricity.

4, the user in less than the minimum use of electricity when using the meter, will cause the counting of significant inaccuracies. The dial will stop rotating when used at less than the starting power.

Baidu Encyclopedia - Electricity Meter