1 KW Watt Meter

Posted on Feb 7, 2014

This watt-meter circuit has measurement range up to 1-KW. This circuit can give the complete (X)(Y) function although uses only one transistor. Actually, this circuit is used for 117 Vac ±50 Vac operation. For lower or lower voltage, this circuit can be modified easily. This circuit only measure power on negative cycles. The advantages of this cir

1 KW Watt Meter
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cuit is this circuit does not need external power supply. This circuit measures true power that is delivered to the load. Here is the schematic diagram of the circuit: At idle section, this circuit draw only 0. 5W. This circuit has load current-sensing voltage of 10mV and load voltage loss of 0. 01%. For linear loads, Rejection of reactive load currents is better than 100:1. When using a 50- A meter movement, the nonlinearity of this circuit is about 1% full scale. Copper shunt can be used to give correct gain due to temperature. [Circuit`s schematic diagram source: seekic. com]

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