Accidentally discovered that the home electric meter overlooks its testimony exactly twice due to the incorrect calculation of electronic pulses. All the counters tested by us turned out to be working "in the double tariff mode"; So how to check the counter? In the photo - an example of an ordinary power meter. Green frame circled numbers "A = 3200IMP / (KW * H)"
They mean that in this particular counter one kilowatt * an hour "runs" exactly every 3200 pulses displayed by the LED "A", which is marked in the photo with a red arrow (I ask you to notice that the number "A" in different meters is very different). It is these electronic impulses that are counted by mechanical wheel drivers. In other words, every three thousand two hundredth impulses marks one calculated kilowatt * hour.
A similar meter, but with a fraudulent preset, there is a kilowatt * an hour is not for 3200, and for 1600 pulses - exactly twice as fast. To check your meter, it is not necessary to sit in front of it and count 3200 pulses (or how many you will have). The most right "segment" of the meter shows not kilowatts, but his hundredths (0.01 kW, in the photo circled with a red semi-grade) and this "segment" is divided into 100 parts.
Through each calculated 1 / 100kw, the characteristic click and the cells of the hundredths of kilowatta is heard on one thing, the smallest, division. It is, in our case the counter must click every 3200/100 = 32 pulse (LED blinking), and personally yours - a / 100 pulse.
The "wrong" counter will be twice as often, in our example - every 16 pulses. In other words, you must check the correspondence of the number of pulses declared by the manufacturer for each kilowatt * an hour with a real number of these pulses, calculating whether the pulses "runs" 0.01kw are really for A 100.
We checked our own. The results are all the same: the overestimation of the testimony is twice.
A source