Electricity: measuring and testing – Testing and calibrating electric meters
Patent
1987-09-21
1989-06-27
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Testing and calibrating electric meters
324115, 324142, 36457101, G01R 1117
Patent
active
048433063
ABSTRACT:
A solid-state watthour meter for registering AC electrical energy consumption by a load connected to a source of AC load current and AC line voltage includes a voltage sensing transducer for producing a signal corresponding to the line voltage and a current sensing transducer for producing a signal corresponding to the load current. A solid-state measurement circuit receives the voltage and current signals as its inputs and produces an output signal corresponding to the AC electrical energy consumption of the load. A power supply, including a regulator circuit having a calibration resistor, provides a DC voltage to the measurement circuit. The DC voltage across the regulator circuit is dependent on the impedance of the calibration resistor. The measurement circuit includes apparatus for relating the registration of the meter to the DC supply voltage. The calibration resistor is readily removably electrically connected in the regulator circuit. Replacement of the calibration resistor causes a change in the supply voltage to the measurement circuit which, in turn, causes a change in the registration of the watthour meter.
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Burns W.
Eisenzopf Reinhard J.
Landis & Gyr Metering Inc.
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