Electricity: measuring and testing – Testing and calibrating electric meters
Patent
1985-01-18
1987-02-24
Karlsen, Ernest F.
Electricity: measuring and testing
Testing and calibrating electric meters
364571, G01R 3504
Patent
active
046460039
ABSTRACT:
An apparatus and method for verifying the accuracy of watt-hour meters at their operational site includes applying a phantom load to the meter and to a watt transducer. The relative watt hour readings of the meter are compared to the watt hours computed from the power to the watt transducer and represented as a percentage error of the meter. The phantom load is constituted by a loading transformer with optional load adjustments to take into account different loads to the meter and there are also adjustment means to take into consideration different meter characteristics. The meter watt hour reading is determined from an articulated light generating and receiving means mounted in alignment with the revolving disc so that light passes through the aperture in the disc to the receiving means and then signals the verifying apparatus to give an indication of the watt hour reading of the meter. Alternatively the reading is obtained manually.
REFERENCES:
patent: 1942258 (1934-01-01), Rutter et al.
patent: 2249075 (1941-07-01), Young et al.
patent: 2938165 (1960-05-01), Greig
patent: 3900794 (1975-08-01), Bell
patent: 4271390 (1981-06-01), Canu
Custom Terminals Corp. (Accu-Ver).
E. J. Brooks Company (Apr. 1, 1980) Ekstrom.
System Jett of North Carolina (Calibration Checker Model SJ621).
H. J. Arnett Industries, Inc. (The Average Beast).
Hood Alan M.
Phillips Charles E.
Karlsen Ernest F.
Southern California Edison Company, Inc.
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