For use with a wiring system having a plurality of wires, a control device having a detector having a plurality of actuatable, observable parts which are numbered, and an electrical circuit coupled with the detector for actuating a specific numbered part thereof when a lead of the circuit is coupled to a particular wire. The apparatus is especially suitable for use in wiring system in which a plurality of wires extend from respective remote stations to a central station. In one embodiment, numbered resistance modules are coupled to the wires at respective remote locations to assign numbers to the wires, and the control device is at the central station for identifying the wires at the central station by successive actuation of the numbered parts of the detector unit. In a second embodiment, a resistance block is coupled to the wires at the central station to assign numbers to the wires, and the control device is used at the remote stations to identify the wires at such remote stations. The detector unit can include a group of light emitting diodes or a liquid crystal display.
A method is provided for determining to which group a connection point forming part of an electrical installation belongs, wherein the electrical installation is divided into at least two groups. For this purpose, use is preferably made of a device including a detecting and measuring device which has a number of detection units. The number is at least equal to the number of groups forming part of the installation. Each detecting unit is provided with a detector for detecting the group in which the signal applied at the connection point is detected. The detecting and measuring device is provided with a transmitter for transmitting a designation of the group in which the signal is detected. An indicating device has a receiver for the signal transmitted by the transmitter and has an indicator for indicating a designation of the group in which the signal is detected.
A boundary scan interface structure (R1, R2, R3) connected between a first terminal (101) of a first analog circuit and a second terminal (103) of a second analog circuit is evaluated by selecting a test voltage to be applied to the first terminal, determining an expected voltage that is expected to be produced at the second terminal in response to application of the test voltage to the first terminal, selecting a reference voltage (REF) as a function of the expected voltage, applying the test voltage to the first terminal to produce a response voltage at the second terminal, and comparing the response voltage to the reference voltage.
Wire identifying apparatus for identifying wires of a multiple wire electrical system as the wires extend between one location and another, said wire identifying apparatus comprising two separate units for use at the two locations, respectively, and designated herein as Unit No. 1 and Unit No. 2, Unit No. 2 having a plurality of terminals for connecting to one end of the wires to be identified and having a ground terminal, Unit No. 2 also having an array of resistors connected in parallel circuit with each other between the ground terminal and the other terminals, there being a different resistor corresponding to each of the other terminals, Unit No. 1 having a plurality of terminals for connecting to the opposite end of the wires to be identified and having a ground terminal, Unit No. 1 also having electrical circuitry including a selector switch having multiple positions corresponding to the number of terminals on Unit No. 1 and a multi-digit read-out display and such that, when the selector switch is moved from terminal to terminal on Unit No. 1, the numbers assigned to the wires on Unit No. 2 will read out on the digital display of Unit No. 1.
An apparatus and method for identifying individual conductors in a multi-conductor cable, which will also identify a short or open circuit condition. One end of the multi-conductor cable is connected to a battery powered transmitter unit which sequentially generates a unique pulse on each conductor. That is, the transmitter generates a pulse on a first conductor having a unique pulse width and after a small delay follows the pulse on the first conductor with a pulse on a second conductor having a unique pulse width, preferably twice the pulse width. The transmitter sequentially steps through each conductor in a cable to generate the unique pulses. The battery powered receiver unit is connected to the other end of the multi-conductor cable with a test probe and a reference probe connected to any two conductors. The receiver determines the pulse width of the pulse on the test probe and because the pulse width is unique to a particular conductor, identifies the conductor and visually displays the conductor identification to the operator. The reference probe acts as a ground during the time period that a pulse is present at the test probe. Advantageously, the apparatus can also determine if two or more of the conductors are shorted or if an open circuit exists.
An apparatus and method of identifying wires or circuits uses plugs with light-emitting diodes ("LED's") attached across the plug contacts corresponding to the wiring circuit. All of the jacks in a terminal or patch panel are filled with such plugs prior to testing and are monitored by a first worker. A second worker, in two-way communication with the first worker, applies a test voltage at the remote terminations of the wires, causing the corresponding LED to light, but no others. The lit LED immediately identifies the circuit, which can be labeled, and the process repeated. When testing is complete, all plugs with LED's are removed from the terminal for re-use.
