Browse Prior Art Database

Cable Continuity Checker

IP.com Disclosure Number: IPCOM000077095D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Coleman, CJ: AUTHOR [+2]

Abstract

This is a cable continuity checker for identifying crossed wires, shorts, opens, and incorrect connector pin terminations.

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Cable Continuity Checker

This is a cable continuity checker for identifying crossed wires, shorts, opens, and incorrect connector pin terminations.

The checker comprises two separate units as follows: Unit 1 includes battery BAT1, indicating fuse F1, and bank of resistors R(1), R(2). . . R(4). Unit 2 includes DC meter M1, test switch SW2, selector switch SW1, adjustable potentiometer P1, and bank of resistors R(1), R(2) . . . R4. Switch SW3 can be added if desired. All resistors are wired in equivalent sets between unit 1 and unit 2 positions, with resistance values determined as follows: R(N) + [R(N) - (N- 1)] = R(N) + 1 such that any set of resistors has a resistance equivalent to the resistance of the first and the last resistor in the series, i.e., such that R(1) + R(4) = R(3) + R(2) or that R(1) + R(N) = R(N-1) + R(2). Where R(N) = last resistor in the series R(1) = first resistor in the series N = number of resistors in bank. The operation of the device is as follows: 1) Unit 1 is connected to the common terminals at the point of origin of the cables to be checked. 2) Unit 2 is placed at each remote location of the cables. 3) SW1 is set to position 1. 4) SW2 "TEST" is energized and P1 is adjusted for an indication near the middle of M1. 5) SW2 "ERROR" is energized and the difference from the reading in Step 3 is noted. 6) SW1 is then set to position 2. 7) SW2 "TEST" is energized and the reading on M1 is noted. If this reading corresponds to that in Step 4,...