Power meter 1KW

Posted on May 12, 2012

The circuit is intended for 117 Vac ± 50 Vac operation, but can be easily modified for higher or lower voltages. It measures true (nonreactive) power beingdeliveredto the load and requires no external power supply. Idling power drain is only 0 W. Load current sensing voltage is only 10 mV, keeping load voltage loss to 01%, Rejection of reactive load currents is better than 100:1 for linear loads

Power meter 1KW
Click here to download the full size of the above Circuit.

Nonlinearity is about 1% full scale when using a 50 µA meter movement.

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