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Process for monitoring equipment and device for implementing said process

  • US 5,659,302 A
  • Filed: 05/24/1996
  • Issued: 08/19/1997
  • Est. Priority Date: 05/07/1990
  • Status: Expired due to Fees
First Claim
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1. A method of monitoring an item of equipment by a user, of the type in which stresses undergone by said items of equipment are sensed and signals corresponding to said stresses are recorded by a monitoring device, and said signals are then read out of said monitoring device, the method comprising the steps of:

  • storing in a memory, rules pertaining to a monitoring job;

    providing at least one sensor to sense said stresses while said monitoring device is in a monitoring state and while said monitoring device is in an acquisition state;

    placing said monitoring device in said monitoring state wherein electrical power is cut off substantially from said memory and from a recorder;

    storing a date and a time at which said monitoring job is started when said monitoring device is first placed in said monitoring state;

    providing threshold detector means, operable in said monitoring state and connected to a threshold voltage level, for determining if said signal from said at least one sensor exceeds a predetermined threshold level;

    changing over said monitoring device from said monitoring state to said acquisition state wherein electrical power is supplied to said recorder, when said signal from said at least one sensor exceeds said predetermined threshold level; and

    sensing sensor signals representing said stresses and recording in real time at least some of said sensor signals as stress data in accordance with said rules pertaining to said monitoring job;

    prohibiting unauthorized access to said rules stored in said memory;

    prohibiting unauthorized access to said stresses data recorded according to said rules; and

    changing over said monitoring device from said monitoring state to said acquisition state when recording any event which may have an effect of neutralizing said at least one sensor.

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