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Utility meter having RF protection

  • US 7,761,249 B2
  • Filed: 01/17/2006
  • Issued: 07/20/2010
  • Est. Priority Date: 01/14/2005
  • Status: Active Grant
First Claim
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1. An electricity meter, comprising:

  • a scaling unit configured to be coupled to at least one power line, the scaling unit operable to generate analog signals representative of at least one aspect of a power line signal on the power line;

    an analog-to-digital (A/D) converter coupled to receive analog signals from the scaling unit and generate digital measurement signals representative of the analog signals;

    a processing circuit operable to generate electricity metering information based on the digital measurement signals;

    a first filter stage operable to attenuate signals in a first frequency range that is higher than a frequency band of interest of the signal to be measured, the first filter stage operably coupled between the scaling unit and the A/D converter; and

    a second filter stage operable to attenuate signals in a second frequency range that is higher than the first frequency range, the second filter stage operably coupled between the scaling unit and the A/D converter.

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