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System and method for introducing meter sensor hysteresis

  • US 5,241,306 A
  • Filed: 08/06/1991
  • Issued: 08/31/1993
  • Est. Priority Date: 08/06/1991
  • Status: Expired due to Term
First Claim
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1. A method for reading a meter including a rotor comprising a shaft and disk affixed thereto, said shaft including a shutter portion including a cutout region, said shutter portion being positioned in a light path between a light emitter and light sensor, comprising the steps of:

  • applying energizing pulses to said light emitter;

    generating a sensor output signal in response to said light sensor;

    setting a detection period of uniform length of time for each energizing pulse; and

    producing, during each said detection period, a digital signal having a logic level indicative of the presence or absence of light transmitted to said sensor,wherein said step of setting comprises delaying the start of said detection period with respect to the corresponding energizing pulse, andthe delay in starting the detection period is set in response to the logic level of the digital signal produced during the detection period corresponding to the previous emitter energizing pulse.

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