Capacitance detecting system and method for testing wire connections
US4173736A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1978 |
| Grant date | Nov 6, 1979 |
| Priority date | — |
| Expiry date | Mar 6, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A computer controlled facility is provided to detect capacitance, and hence defective connections, between a group of wires in a telephone handset cord and terminal blades of plugs connected at both ends of the cord. The test depends upon ascertaining the capacitance between a properly connected terminal blade and wire and the other terminal blade and wire connections to provide exact indications of the terminal blades and wires which are not properly connected. Capacitance is detected by connecting a good wire and blade connection along with another wire and blade in a capacitance network associated with one stage of a free running multivibrator which produces an output wave in accordance with the capacitance between the connected pairs of wires and blades. A delayed pulse is cyclically generated to act in conjunction with the output wave to control a bank of indicator lights to provide an indication of any defective wire to blade connections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.