Non-intrusive cable tester
US5894223A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1997 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Sep 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/083
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A cable tester is described for low frequency testing of a cable for faults. The tester allows for testing a cable beyond a point where a signal conditioner is installed, minimizing the number of connections which have to be disconnected. A magnetic pickup coil is described for detecting a test signal injected into the cable. A narrow bandpass filter is described for increasing detection of the test signal. The bandpass filter reduces noise so that a high gain amplifier provided for detecting a test signal is not completely saturate by noise. To further increase the accuracy of the cable tester, processing gain is achieved by comparing the signal from the amplifier with at least one reference signal emulating the low frequency input signal injected into the cable. Different processing techniques are described evaluating a detected signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.