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Non-intrusive appliance monitor apparatus

  • US 4,858,141 A
  • Filed: 04/14/1986
  • Issued: 08/15/1989
  • Est. Priority Date: 04/14/1986
  • Status: Expired due to Term
First Claim
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1. Apparatus for non-intrusive measurement of energy usage and operating characteristics of each of a plurality of individual electric units, said units each contributing to a portion of a total electric load of a circuit of a facility, comprising:

  • (a) sensor means for measuring electrical characteristics of the total load of said circuit and producing an analog signal proportional thereto, said sensor means being coupled to said circuit at a location external to said facility;

    (b) analog-to-digital conversion means for converting said analog signal into a digital signal; and

    (c) signal processor means responsive to said digital signal for separating out said portion of the total load contributed by each of the plurality of units.

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