Abstract: The invention provides a system for locating a fault in a conductor such, as a break in a buried wire. The system includes a first conductor portion and a second conductor portion separated from each other by the fault, the system including a field generator, having: a first connection connectable to the first conductor portion, a first signal generator configured to apply a first oscillating signal between the first connection and an earth, the first oscillating signal having a frequency of between 1 and 20 kHz, and a mobile detector for detecting an electric field produced by the application of the first oscillating signal to the first conductor portion, the detector including a capacitive sensor element, a signal processor to which the sensor element is connected and having an output, and a monitor receiving the output from the signal processor and providing a signal to an operator to indicate the position of the fault.

Abstract: The invention provides a system for locating a fault in a conductor such, as a break in a buried wire. The system includes a first conductor portion and a second conductor portion separated from each other by the fault, the system including a field generator, having: a first connection connectable to the first conductor portion, a first signal generator configured to apply a first oscillating signal between the first connection and an earth, the first oscillating signal having a frequency of between 1 and 20 kHz, and a mobile detector for detecting an electric field produced by the application of the first oscillating signal to the first conductor portion, the detector including a capacitive sensor element, a signal processor to which the sensor element is connected and having an output, and a monitor receiving the output from the signal processor and providing a signal to an operator to indicate the position of the fault.

Abstract: Devices, methods and systems for assessing telecommunications wiring between a first plurality of terminals and a second plurality of terminals are disclosed. A system includes a first device and a second device. The first device can be in electrical communication with the first plurality terminals to listen for terminal identification data that is receivable on each of the first plurality of terminals, wherein the device is configured to decode, for each terminal of the plurality of terminals, identification data that is specific to a single terminal of the second plurality of terminals. The second device is a sender device configured to generate different signals for respective terminals of the second plurality terminals, each signal encoding different terminal identification data.

Abstract: A method for determining whether an electrochemical cell is substantially fully charged. The determination is made by ascertaining the rate of change of the impedance of the cell with changing frequency, at low frequency. A method for determining the state of charge of an electrochemical cell by comparing the impedance of the cell at two or more frequencies or by comparing the impedance of the cell, at a medium frequency, with the impedance at high frequency. Apparatus for generating output signals representative of the magnitude of resistive and reactive components of an impedance (30). The apparatus has a signal generator (70) for passing AC current through the impedance, and a synchronous demodulator circuit (88) for demodulating AC signal appearing across the impedance pursuant to passing the current through it. A phase shift circuit (130, 132, 136, 138, 140) selectively generates control signals in phase or 90.degree.