Electricity: measuring and testing – Fault detecting in electric circuits and of electric components
Patent
1985-04-12
1987-07-14
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
324439, 340515, G01R 3102
Patent
active
046805370
ABSTRACT:
A method and apparatus for testing a circuit which senses the condition of an electrical quantity, the sensing circuit having a sensing portion which indicates a predetermined condition of the electrical quantity of a load connected between a pair of sensing terminals, and having a current conducing device which is activated a given time after the sensing portion indicates the predetermined electrical condition. The testing apparatus includes a network which is connected to the sensing circuit terminals for simulating 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 causing the predetermined condition to be simulated for a time adequate to test the sensing circuit response but inadequate to provide sufficient energy to activate the device. The network preferably has another branch for simulating the absence of the predetermined condition in the load, and a switch for selecting which of the branches is connected to the sensing circuit terminals. The testing apparatus also includes monitoring apparatus which is connected to the sensing circuit terminals for comparing the actual response of the sensing 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 desired responses of the sensing circuit are within or without a predetermined range of coincidence.
REFERENCES:
patent: 2543754 (1951-03-01), Beach
patent: 2976485 (1961-03-01), Bartz
patent: 3366055 (1968-01-01), Hollander
patent: 4510571 (1985-04-01), Dagostino et al.
Conax Florida Corporation
Eisenzopf Reinhard J.
Harvey Jack B.
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