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Electrical energy meters having factory set calibration circuits therein and methods of calibrating same

  • US 5,514,958 A
  • Filed: 11/22/1994
  • Issued: 05/07/1996
  • Est. Priority Date: 11/22/1994
  • Status: Expired due to Fees
First Claim
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1. An electrical energy meter, comprising:

  • a meter housing;

    means, in said housing, for metering a quantity of electrical energy transferred from a line to a load during an energy measurement time interval, said metering means comprising;

    means for sensing a line voltage and a line current transferred to the load during the energy measurement time interval;

    means, connected to said sensing means, for generating an energy signal based on the sensed line voltage and the sensed line current; and

    means, connected to said generating means, for calibrating said generating means so that the energy signal accurately reflects the quantity of electrical energy transferred to the load during the energy measurement time interval, said calibrating means comprising a power factor calibration circuit containing at least one pair of antiparallel-connected diodes and a gain calibration circuit having a plurality of parallel connected resistors therein, and wherein all but one of said plurality of resistors have a resistance greater than the resistance of another of said plurality of resistors; and

    means, in said housing and responsive to said metering means, for registering the metered quantity of electrical energy transferred to the load during the energy measurement time interval.

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