| 摘要 |
Method and apparatus facilitate improved sensing of tampering of an electrically powered device, such as an electric watt-hour meter installed at a residence for metering the amount of electric energy consumed at the residence. The detected tampering involves an effort to remove the electric meter from its power socket, to interrupt the metering of electric energy consumption, or to otherwise gain access for diverting electric energy. Removal of the electric meter from its power socket interrupts power to the meter. The method and apparatus senses motion of the meter and sets a "Tamper Flag" in a non-volatile memory. The "Tamper Flag" is saved (i.e., is not cleared from the non-volatile memory) if loss of power to the meter occurs within a predetermined period of time. The "Tamper Flag" is cleared if there is no loss of power to the meter within the predetermined period of time. Upon detecting a resumption of power after a loss of power to the meter, an indication of sensed tampering is made if the "Tamper Flag" is set.
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