专利名称：Method and apparatus for testing a
conductivity sensing circuit
发明人：Francis M. Miller申请号：US06/722679申请日：19850412公开号：US04680537A公开日：19870714
摘要：A method and apparatus for testing a circuit which senses the condition of anelectrical quantity, the sensing circuit having a sensing portion which indicates a
predetermined condition of the electrical quantity of a load connected between a pair ofsensing terminals, and having a current conducing device which is activated a given timeafter the sensing portion indicates the predetermined electrical condition. The testingapparatus includes a network which is connected to the sensing circuit terminals forsimulating a load having the electrical quantity to which the sensing circuit is responsive,the network having at least one branch which simulates the existence of the
predetermined condition in the load, and the network having a timing component causingthe predetermined condition to be simulated for a time adequate to test the sensingcircuit response but inadequate to provide sufficient energy to activate the device. Thenetwork preferably has another branch for simulating the absence of the predeterminedcondition in the load, and a switch for selecting which of the branches is connected to thesensing circuit terminals. The testing apparatus also includes monitoring apparatus whichis connected to the sensing circuit terminals for comparing the actual response of thesensing circuit to the load simulation provided by the network to the desired response of
the network, and the monitoring apparatus indicates whether the actual and desiredresponses of the sensing circuit are within or without a predetermined range ofcoincidence.
申请人：CONAX FLORIDA CORPORATION
代理机构：Christel, Bean & Linihan
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