DAVID J MILLER
Broker in Arlington, MA
License number
Massachusetts 9056939
Issued Date
Aug 14, 2003
Expiration Date
Jul 3, 2018
Type
Broker
Address
Address
Arlington, MA 02476
Professional information
Cable Tester For Multi-Pair Shielded Cables
US Patent:
4074187, Feb 14, 1978
Filed:
Nov 30, 1976
Appl. No.:
5/746071
Inventors:
David H. Miller - Arlington Heights MA
Peter M. Mena - North Grafton MA
Peter M. Mena - North Grafton MA
International Classification:
G01R 3102
US Classification:
324 51
Abstract:
Apparatus is described for detecting the presence of a variety of electrical faults in a multi-pair shielded cable from a junction box connected to the cable at one end and to a socket connected to the cable at the other end. The apparatus includes a first module which is adapted to be connected to the appropriate set of terminals of a main junction box connected to one end of the cable and a second module which is adapted to be connected to the socket at the other end of the cable. To use the apparatus each module is connected to its respective termination. The first module includes a battery, a termination and a plurality of light emitting diodes, resistors and switches arranged to give a visual indication of faults in the form of shorts between two wires in the cable, shorts between one wire in the cable and the grounding shield and continuity between a pair of wires in the cable. The second module includes a termination and a plurality of light emitting diodes connected to the terminals of the termination in a manner so as to give a visual indication of the polarity of a pair of companion wires in the cable and cable identification of the pairs of wires in the cable.