Here is a simple calculation to check the accuracy of 1-ph electronic (static) meter connected at your premises.
Here we will calculate the accuracy by pulse test simply counting the pulses displayed on meter.
Now what you have to do is first of all switch off all the appliances connected at your home. Check there is nothing ON even a small zero watt lamp for better accuracy. Now switch on a single appliance whose wattage consumption you know. Like fan which is of 70W, CFL of 40W etc. You can see its rating on name plate of appliance if you don't know it.
Now open stopwatch in your mobile. And start to count pulses (LED blinks) displayed on meter for the duration of 1 minute. Note the No. of pulses you have counted.
Now look at the nameplate of meter where there is some number besides LED that blinks when some load is on. As per different company's meter there is different figure like 3200 imp/kWh for genus, 6400 imp/kWh etc. Image of Genus meter is shown below. you can see 3200imp/kwh in box.
.
Now apply below equation.
No. Of Pulses(blinks) in one minute
should be for accurate meter = (connected load * meter imp/kwh) / 60000
For example, if you have switched ON 600W load and meter have 3200imp/kWh,
Than
No. Of pulses(blinks)
in one minute should be = (600 * 3200) / 60000 = 32
Now compare these result with the no. Of pulses you have counted for 1 minute. If the pulses you have counted is more than this calculation, your meter is fast, means it records more units than you have consumed. If your count is around 30 or 34 than meter is OK because Human errors also occurred during count.
Also as per the rule, 1% error is acceptable.
Here we will calculate the accuracy by pulse test simply counting the pulses displayed on meter.
Now what you have to do is first of all switch off all the appliances connected at your home. Check there is nothing ON even a small zero watt lamp for better accuracy. Now switch on a single appliance whose wattage consumption you know. Like fan which is of 70W, CFL of 40W etc. You can see its rating on name plate of appliance if you don't know it.
Now open stopwatch in your mobile. And start to count pulses (LED blinks) displayed on meter for the duration of 1 minute. Note the No. of pulses you have counted.
Now look at the nameplate of meter where there is some number besides LED that blinks when some load is on. As per different company's meter there is different figure like 3200 imp/kWh for genus, 6400 imp/kWh etc. Image of Genus meter is shown below. you can see 3200imp/kwh in box.
.
Now apply below equation.
No. Of Pulses(blinks) in one minute
should be for accurate meter = (connected load * meter imp/kwh) / 60000
For example, if you have switched ON 600W load and meter have 3200imp/kWh,
Than
No. Of pulses(blinks)
in one minute should be = (600 * 3200) / 60000 = 32
Now compare these result with the no. Of pulses you have counted for 1 minute. If the pulses you have counted is more than this calculation, your meter is fast, means it records more units than you have consumed. If your count is around 30 or 34 than meter is OK because Human errors also occurred during count.
Also as per the rule, 1% error is acceptable.
