Francis R Welsh

US Patent:

46510842, Mar 17, 1987

Filed:

Jan 4, 1985

Appl. No.:

6/688981

Inventors:

Francis X. Welsh - Perkasie PA
Desmond E. McBride - Willingboro NJ

Assignee:

RCA Corporation - Princeton NJ

International Classification:

G01R 3102

US Classification:

324 51

Abstract:

Two parallel chains of resistances of like value are coupled between a pair of terminals to which a test voltage is applied. One chain is formed by connecting each cable conductor between a different pair of resistances in alternating serial fashion. A plurality of comparators each compare the potentials at nodes between pairs of corresponding resistances in each chain. The outputs of the comparators are coupled to a NAND gate for giving a fault indication when the output of one or more comparators changes state in response to one or more sensed faults.