Browse Prior Art Database

Open Circuit Detection Arrangement

IP.com Disclosure Number: IPCOM000079497D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Vander Sar, P: AUTHOR

Abstract

This system permits remote detection of open circuits in wires leading to a number of voltage sources located in a corrosive environment.

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Open Circuit Detection Arrangement

This system permits remote detection of open circuits in wires leading to a number of voltage sources located in a corrosive environment.

In the sketch, wires W1, W2, W3 are connected to equal-valued, series- connected sources V1, V2 and to the detection system. The detection system includes filter resistors R1, R2, R3, R4; switches S1, S2; equal-valued capacitors C1, C2; and voltmeters M1, M2. Voltmeters M1, M2 measure the voltages VC1, VC2 on capacitors C1, C2, respectively.

To determine which, if any, of wires W1, W2, W3 are open, switches S1, S2 are first closed to bring VC1, VC2 to zero volts.

Then S1 is opened and, after a brief interval, VC1 is measured. Then S1 is closed and S2 is opened. After a brief interval VC2 is measured. This pair of measured values of VC1 and VC 2 determines the condition of wires W1, W2, W3 by reference to the following table: VC1 (with VC2 (with

W1 W2 W3 S2 closed) S1 closed) shorted shorted shorted V V open shorted shorted O V shorted shorted open V O shorted open shorted 2V 2V any two open, or all open O O.

Thus, if VC1 is V volts and VC2 is zero volts, there must be an open circuit in wire W3.

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