How do you read a single phase power meter? Power meter readings are calculated

A power meter is a mechanical indicator meter that measures the power in a DC and AC circuit. The power in the DC circuit and the AC circuit are p=ui and p=uicos u, i is the load voltage and current, is the angle between the current phasor and the phasor, and cos is the power factor. Although the measuring mechanism of each type of meter may constitute a meter for measuring power, the most suitable for making power meters are the measuring mechanisms of electric meters and ferromagnetic electric meters.

The rotational torque m of this meter measuring mechanism is related to I1I2COS, i1 is the static coil current, i2 is the moving coil current, and the angle between the two current phasors. Passing the load current i through the static coil i.e. i1=i. If the load voltage is added to the moving coil and the large resistor r connected in series with the moving coil, the current in the moving coil i2=u r.

In this way = and the rotational torque m=ki1i2cos which reflects the magnitude of the power p.

Changing the resistance value in series with the moving coil can change the voltage range, and changing the two coils of the static coil from series to parallel can expand the current range. The dial of the power meter is generally multiplied by the rated voltage and the rated current, and the power factor cos 1 is used to mark the value. For example, the voltage range is 300V, the current range is 5A, the power meter has a full scale value of 300 5 1 1500W, and the dial is 300 5 1 1500W.

There are also low power factor power meters made with a power factor of 300 5 . The range of the power meter should not simply mention the power range, but should also specify the voltage, current range and power factor value.

Read the number on the meter, if there is a transformer multiplied by the multiple of the transformer.

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Power Meter Reading Calculation Portable power meters generally have several current ranges and voltage ranges, but there is only one scale, so the scale of the power meter is only marked with the number of grids, not the number of watts. When different ranges are used, the power meter scale. <>

<> the grid constant c of the power meter can also be calculated as follows: where um is the voltage range of the power meter; IM is the current range of the power meter; cm is the number of grids of the full scale of the power meter. After finding the grid constant c of the power meter, the measured power can be calculated.

p=。where a is the number of squares for the pointer to deflegate. D34-W type, D51 type power meter range, internal resistance, and the power value represented by each grid are shown in the table.

Power meter readings are calculated

Will you do the fifth question?

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Kaizen Huai Sui Xin] power meter reading calculation portable power meter generally has several current range and voltage range, but there is only one scale, so the scale of the power meter is only marked with the number of grids, not the number of watts. When different ranges are used, the power meter scale. <>

<> the grid constant c of the power meter can also be calculated as follows: where um is the voltage range of the power meter; IM is the current range of the power meter; cm is the number of grids of the power meter scale. After finding the grid constant c of the power meter, you can ask him to open the measured power.

p=。where a is the number of squares for the pointer to deflegate. D34-W type, D51 type power meter range, internal resistance, and the power value represented by each grid are shown in the table.

Pro-upgrade service teacher to help you do it.

No, I'll just do the math.

The dial of the extended information power meter is generally multiplied by the rated voltage and the rated current, and the power factor cos 1 is carefully used to mark the value. For example, the power meter with a voltage range of 300V and a current range of 5A has a full-scale value of 300 5 1 150 on the dial in the ultra-high frequency and microwave frequency bands, and there are TEM waves and non-TEM waves. In the coaxial system of TEM waves, voltage and current have precise meanings, but their absolute values are difficult to measure.

In waveguide systems, voltage and current lose their uniqueness because of the different electromagnetic modes. Power is an important method to characterize signal strength in each frequency band and transmission system. In RF Fankuanmeng, the direct measurement of power replaces the measurement of voltage and current.

According to known conditions, the voltage of the power meter UCA = 380 150 degrees, and the current I = 10 -30 degrees.

Then the power meter reading = 380 * 10 * cos (180) =

Based on the ** you provide, your meter currently reads 10911.

The numbers in a row of windows on the meter's dial indicate the cumulative electricity consumption recorded by the meter; The meter in the picture has a 5-digit window, starting from the far right, which is a single digit, a ten, a hundred, a thousand, and a 10,000.

If you need to calculate the actual electricity consumption during a certain electricity consumption period, the electricity consumption = the meter reading reading of this meter reading - the meter reading of the upper transport shirt, if your meter is equipped with a transformer, you also need to multiply the multiplier of the transformer.

We hope we can help you.

Hello: ignore decimals) blind geared metersThe reading is 10911, the most stupid Bu Shen accompanies the right side of the number has a bar, indicating a decimal, which can also be ignored.