Electricity: measuring and testing – Testing and calibrating electric meters
Patent
1992-02-27
1993-12-07
Karlsen, Ernest F.
Electricity: measuring and testing
Testing and calibrating electric meters
324110, 324 96, 307311, G01R 3100
Patent
active
052686337
ABSTRACT:
A method and apparatus for testing the proper operation of the optical elements in the optical detection circuit of an electronic register in an energy meter. The light emitter circuit is periodically pulsed adequate to turn the emitters to the on condition, and a comparison circuit is provided in which the voltage across a monitor point in circuit with the light emitters and a switching circuit is monitored both before and after each pulse. The absence of a voltage change upon pulsing the light emitter circuitry is used to generate a first error or failure signal. The light detector is read prior to each pulse to determine if unprogrammed light is being received prior to the pulsing of the light emitter as an indication of tampering with the accurate reading of the energy meter, and a second error signal is generated in response to unprogrammed light. The first error signal is displayed at the energy meter to the meter reader, while the second error tampering signal is stored and downloaded through an optical link for analysis at the power company.
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Beulick John S.
Burns William J.
General Electric Company
Karlsen Ernest F.
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