Abstract: A testing implement that can be electrically connected to a test-alarm pa in a vehicle fire-suppression system for verifying the integrity of the panel circuitry. The testing implement can be used with the test-alarm panel installed in a vehicle or outside the vehicle (i.e., bench testing). The implement can also be used to test the integrity of electrical cables used in the fire-suppression system.

Abstract: Testing of conductors of a telecommunications cable in which, after stripping cable material surrounding one end of the core, the conductors in the end are separated from one another and are embedded within a dielectric material. The dielectric material is initially flowable and is caused to fill spaces between the conductors. After hardening, the dielectric material forms a solid mass with conductor end portions embedded within it. A planar end face is then formed on the solid mass with the electrically isolated conductor ends terminating at the end face. An electrically conductive probe is then moved successively into contact with exposed conductor ends to pass an electrical current to be passed into the ends to enable measurements to be taken of any desired electrical property.

Abstract: Apparatus for testing a multiconductor cable is disclosed. The disclosed cable testor comprises a counter, the output of which is applied as a test signal to a portion of the conductors in the cable under test. A test signal for the remaining portion of the conductors in the cable under test is derived by inverting the output of the counter. Cable faults are detected by comparing the signals out of the cable to the applied test signals. The apparatus is controlled by a state machine which causes test signals to be successively generated until a cable fault is detected or a full set of test signals has been generated.

Abstract: A method and system for determining the status of power distribution cables which involves the removal of a plug from the sheath which is tiny relative to the size of the cable to expose an area of resistive material which may be probed to detect the presence or absence of a signal of predetermined frequency. The apparatus is equipped with self-testing circuits as well as circuits for determining resistance between the resistive layer and the sheath, whereby positive identification of the cable to be tested is assured. The apparatus is clamped directly to the cable and is controlled from a remote location, which protects the operator of the equipment. The plug removed from the sheath is cut and extracted by a tool which is also subject to remote control by the operator.

Abstract: A telecommunications circuit pairs identifier device that has a transmitter portion that is connected to a predetermined group of pairs at the trunk line termination point and a receiver that is plugged at each one of the jacks distributed in a given network. The transmitter continuously accesses each one of the circuit pairs by counting them and transmits, during the time of access or selection, the count for that particular jack. The receiver portion of the device is removably connectable to each jack and detects, decodes and displays the output sent so that a user can identify the pair in the jack with a particular predetermined pair termination.

Abstract: 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.

Abstract: A tradesman may identify which circuit is connected with any number of outlets or other terminations in an electrical wiring system, such as commonly found in buildings, through the use of a handheld, carry-about detector-indicator device. Operation relies upon having prearranged excitation of each of several circuits typical of the usual building power distribution through introducing unique tag signals into each of the various wiring circuits by connecting a tag signal exciter to the building's wiring, usually at the main power box. The tradesman then may merely walk about and "plug" the indicator into various outlets or, by a suitable adaptor or clip leads, connect with lamp receptacles and the like, whereupon the indicator will give display of a "number", for example between "1" and "8", or some other such display which will promptly tell the user which circuit his detection indicator is coupled with.

Abstract: Electrical continuity between the terminals of a multi-contact electrical connector and the cores of insulated leads that have been connected thereto, is tested for by engaging a respective electrical test probe with each of the terminals and using a multiplexer to connect each test probe in turn to a continuity testing circuit, under the control of a computer. Following the continuity test, a bank of analog switches also controlled by the computer is used to apply short circuit test electrical potential to energize selected terminals, and the presence of the test potential on adjacent unenergized terminals is tested for by the computer, to detect short circuiting between the terminals.

Abstract: A self-contained unit intended primarily for tracing the circuit connection between electrical outlets and a circuit-breaking connection thereof to an AC power source. The unit includes a housing containing batteries, a buzzer or other sound-producing means, an AC relay and a switch for selective placement in either of two positions. An electrical cord extends from the housing and terminates in a male plug for insertion in a receptacle of the circuit to be traced. By placing the switch in its first position the buzzer will sound when the AC power is supplied to the receptacle; placing the switch in its second position will cause the buzzer to sound when AC power, initially present, is removed from the receptacle. A second embodiment adds to the foregoing the capability of testing unpowered circuits for continuity between two conductors by incorporating an additional selectively positioned switch.

Abstract: The methods and apparatus for checking the operability of eight conductors simultaneously including four pair cable which may be connected to any of several types of electronic or electromechanical telephone systems. The apparatus is connected directly to the cable by utilizing a modular four pair jack and plug. Said apparatus may be used by connecting directly to a phone system and observing LED illuminations configured by operating any one of four switches individually or simultaneously. In addition, pre-service wiring can be tested by using shorting plugs or LED shorting plugs on the opposite end of the cable that is connected to the test apparatus. The tests and methods will indicate opens, shorts, polarity reversals and wire transposition by LED illuminations and warble tone which is generated out over the cable pair. This test apparatus is compatible with most existing telephone systems, from the oldest key system to the latest electronic PBX switches. The device is self powered by a nine volt battery.

Abstract: A fixture is provided for holding a cable end connector to which wires are to be attached. The fixture includes an indicating element for each of the connection elements of the connector to be wired. A separate fiber-optic cable extends from each indicating element to a separate light source for individually providing illumination to the separate indicating elements. A means is provided for making an electrical connection to individual electrical elements to separately identify each of the different wires to be assembled, and an electrical driving means is connected to respond to the electrical connection means for energizing the corresponding one of the light sources corresponding to the connection element to which the associated wire is to be assembled.

Abstract: Apparatus for testing wiring harnesses either during or after the harness fabrication process comprises test points, each of which is connected to a corresponding terminal of the harness. Associated with the test points are a current source, a current sourcing means, a current sink, and a current sinking means. Each current sourcing means and current sinking means comprises a controlled conduction path which is selectively operable to a conductive state or a non-conductive state. The tester operates to test individual circuits of the harness for continuity and shorts. In doing this the controlling conduction paths are selectively operated in accordance with information correlating the wiring harness circuits with the test points. A current sensing means senses the present or absence of current during open and short circuit tests and provides appropriate indicator signals to indicate opens or shorts if such faults are present.

Abstract: 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 essentially 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.

Abstract: The telephasing method and system identify an unknown phase within a polyphase network by comparison of the unknown phase with a known reference phase of the polyphase network. The system is especially designed for carrying out the identification of the unknown phase when the reference phase is located at a point of the polyphase network far from the point where the unknown phase is located. The system comprises a first device connected to the reference phase and a second device connected to the unknown phase. The first and second devices each comprise a modem for establishing a telephone connection between the two devices. The first device includes circuitry to produce a digital signal representative of the alternating voltage of the reference phase. This representative signal is transmitted through the two modems and the telephone connection from the first to the second device. The second device comprises circuitry to produce a digital signal representative of the alternating voltage of the unknown phase.

Abstract: A system and method for documenting and checking the common connections provided by each wire of a cable between connector terminals located at opposite ends of the cable. The system includes a cable analyzer which is used to generate control information for quickly and reliably verifying standardization of each cable design, an optional printer or other suitable means of documenting the control information, and a binder or other appropriate means for organizing and filing the documentation which contains the control information. The analyzer automatically scans and records the common connections provided by each wire of the cable between the connector terminals at the ends of the cable. The terminal interconnections may then be printed so as to document the cable design for later reference. The analyzer also uses the terminal interconnections to automatically generate and record a unique alphanumeric or numeric code, called a "cable signature," which is also printed as part of the design documentation.

Abstract: Firstly, each of the cores of a multicore cable are connected at one end thereof to the respective contacts of one of two connectors at random. Then, using a detector for detecting the change of electrical conditions of the cores, detection is made in a random fashion for the other ends of the cores to determine to which line contact of the one connector the one end of the corresponding core has been connected. The other end of the detected core is connected to a contact of a desired line of the other connector. In this manner, the both ends of the cores are connected to contacts of desired lines of the two connectors.

Abstract: A continuity detecting apparatus for testing the continuity of conductors in damaged cables, comprises at least two test cables, each having a proximal end and distal end. The distal end of each test cable is adapted to be electrically connected to a respective end of a conductor to be tested. The apparatus includes a detector adapted to provide an output signal in response to an input signal exceeding a predetermined threshold level, a device for connecting the proximal end of at least one of the cables to a signal source and the proximal end of another of the remaining cables to the detector, and an indicator responsive to the output signal for providing an indication of current flow through a conductor connected between the distal ends of the one and the other cables.

Abstract: 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.

Abstract: A tester for telephones and telephone answering systems features a dialing test capability for high speed dialing systems by providing the dialed digits in a single display element serially in time at a delayed rate set by strobing the digits from a memory storage element. A two-level ringing signal is provided to test for marginal telephone bell sensitivity. Means are further provided for reversing the emulation of the central office battery polarity so as to test for diode failure in electronic telephones. A simple cord circuit test for open- and short-circuit in the wall and handset cords, and moreover provides for detection of connector wiring reversal. Precision long-duration ringing burst capability is provided, along with ringback, dial tone, cut-out, and two-way communication between a telephone answering system under tests and a supplemental telephone as to provide for complete testing of the various phases of actuation of automatic answering systems.

Abstract: Universal telephone test apparatus is shown according to the preferred embodiment of the present invention as including first and second test jig apparatuses. The test jig apparatuses include in their most preferred form three light emitting diodes (LED's) for each pair of wires of a multiple wire pair cable. The test jig apparatuses may be electrically connected to the telephone electrical connection blocks allowing simultaneous diagnosis of all possible electrical connection conditions of each of the wire pairs of the cable. Additionally, the test jig apparatus may be electrically connected to telephone base cords by auxiliary jacks for simultaneous diagnosis of all possible electrical connection conditions of each of the wire pairs of the base cords. Further, auxiliary jacks are further provided for receiving individual wires for contact to selected pin sets for continuity and tone testing the wire pair.

Abstract: An apparatus and a method is provided for verifying electrical coupling between a first contact point of an electrical device on a circuit board and a first connection pin, on a board tester. Within the tester, a JK flip-flop is electrically coupled to the first connection pin through an amplifier. A Q output of the JK flip-flop is initialized to a logic 0. An electrical probe with an electrical voltage is stroked across the first contact point and any other contact points on the circuit. If the first contact point is electrically coupled to the first connection pin, a logic 1 will be held on the Q output of the JK flip-flop. If there is no electrical coupling, then a logic 0 will be held on the Q output. By reinitializing the JK flip-flop and electrically coupling it to another connection pin, electrical coupling between another contact point and another connection pin may be tested.

Abstract: An electrical circuit identification means for identifying a particular circuit while the latter is normally energized and functioning, said means being usable with a plurality of energized circuits leading to different remote locations in an electrical installation such as a building structure or other facility, where the circuits originate at an energy distribution network that has fuses, circuit breakers or the like adapted to render the circuits dead or unenergized. A portable electrical load device is provided, to be applied to a designated circuit at the remote location where it is to be worked on, said device including a circuit controller or interrupter activated and powered by current from the circuit, so as to periodically interrupt or vary the current passing through the load and thereby cause electrical pulses or surges therein.

Abstract: An alarm apparatus for use with a numerically controlled twisted pair wire wrap wiring machine that indicates to the operator the position and the wire of a pair that is to be wired. The apparatus is connected to the indicator lights of the machine and to the wiring gun to sense the gun placement on the pin. The proper conditions are logically combined, should a condition be changed as by placing a signal wire on a grounded pin an alarm is sounded.

Abstract: A coaxial cable tester device includes a transmitter unit and a receiving unit. The transmitter unit includes first and second coaxial connectors, each having a center conductor and a ground conductor. There are means for isolating the ground conductors of the first and second connectors from each other. There is a power supply having first and second terminals, one connected to the center conductors and the other to the ground conductors of the first and second connectors. A short indicator circuit is connected across the terminals; the short indicator circuit includes a short switch and an indicator device in series. The receiver unit includes third and fourth coaxial connectors, each having a center conductor and a ground conductor. There are means for isolating the ground conductors of the third and fourth connectors.

Abstract: An electronic fuel injection system tester performs a plurality of system integrity tests on individual components and sensors of the system. The tester is plug compatible with the various wiring harness and connectors of the fuel injection system to permit a plurality of integrity tests to be performed either simultaneously or in rapid succession. The tester may be used to test a wide variety of fuel injection systems found in many popular vehicles by virtue of a multiple purpose electronic circuit and front panel template overlays corresponding to each make of vehicle or type of fuel injection system.

Abstract: The integrity and connection of cable wires (10-13) extending between two banks of terminals (20-1 to 20-4 and 16-19) are checked for shorts of the wires to ground, to battery wiring between each other and for opens and misconnections or cross-connections of the wires. Unique recognition circuits are provided for controlling, analyzing (circuits 43, 53, 68, 92, 112, 181) and displaying (displays 23, 24, 31 and 32) the test results to accordingly apprise an operator(s) stationed at either or both ends of the cable.

Abstract: The integrity and connection of cable wires (10-13) extending between two banks of terminals (20-1 to 20-4 and 16-19) are checked for shorts of the wires to ground, to battery wiring between each other and for opens and misconnections or cross-connections of the wires. Unique recognition circuits are provided for controlling, analyzing (circuits 43, 53, 68, 92, 112, 181) and displaying (displays 23, 24, 31 and 32) the test results to accordingly apprise an operator(s) stationed at either or both ends of the cable.

Abstract: A probe-type electrical identifying device for identifying individual conductors in a multiple conductor group such as in a cable or extending through a conduit pipe, including a conductor indicator probe and voltage supply unit, wherein the probe has a pair of light emitting diodes (LEDs) of different color and is capable of distinctively identifying as many as five individual conductors in the group. Connector leads having alligator clamps are provided to connect to the individual conductors at one end. The voltage supply unit has switches assigned to five of the connector leads and electrical circuitry is provided to enable distinctive identification of the five different conductors by different activation of the two LEDs in the probe.

Abstract: An apparatus for electrically testing a multi-core cable comprises a pick-up unit (6) for picking up a core separately on a one by one basis from a group of cores (101) at one end of the cable (100). Conductor wires of all of a plurality of cores (101) of a cable are collectively rendered conductive by a contact grip (25, 25') at one end of all the conductor wires the opposite ends of which are immersed into a conductive liquid (41) in a vessel (39) at the other end of the cable. The conductor wire of the picked up core is electrically separated from the other cores and power is supplied to the picked up conductor wire so that a current flows through the picked up wire, the conductive liquid, the conductor wires of other cores and through the contact grip to ground.

Abstract: A system for identifying a selected conductor at the other end of a multinductor cable. A signal is imposed on the selected conductor at one end. At the other end of the cable, a probe is capacitively coupled successively to the several conductors. The selected conductor is identified by the relatively large capacitively coupled signal.When capacitive coupling between wires may degrade system performance, signals of two different frequencies may be applied to the selected conductor and another conductor, respectively. The selected conductor can be identified by the large ratio of the magnitude of signal detected at the frequency applied to the selected conductor as compared to the magnitude of the signal detected at the other frequency.

Abstract: A splicing module test set for determining correct connections of new subscriber line connections to existing subscriber lines in a telephone system, including those systems with special service telephone lines. The test set provides an indication to a craftsperson that a proper and correct connection has been made to the new subscriber line without interrupting existing subscriber service, said lack of interruption being particularly important for special telephone lines.

Abstract: There is disclosed a cable test unit for use in testing multi-conductor cables containing a plurality of wire pairs. The invention includes means for supplying a constant D.C. voltage; a time-governed oscillator; a recycle pulse generator for releasing sequential pulse outputs; a connector test base having anode and cathode sides; a plurality of LEDs, each corresponding to a respective wire pair, and electrically connected to the test base; means for inhibiting induction across all wire pairs except the pair at which a pulse output from the recycle pulse generator exists; and means for recycling the pulse generator. The current flow characteristic across a given wire pair varies as a function of its structural condition as either a short, open, or crossed circuit, or a loose connection, and such characteristic is reflected in the visual appearance and behavior of the LED corresponding to that wire pair.

Abstract: An arrangement for indicating when different types of electrical components, such as circuit boards and the like, are concurrently joined with connector assemblies. Common to the connector assemblies is a plurality of output conductors which is connected to corresponding plurality of output terminals positioned on each of the connector assemblies, respectively. On each component is a plurality of identification conductors arranged to identify the component through the application of a distinct pattern of potentials on the output conductors when one of the components is joined with one of the connector assemblies. When different types of components are concurrently joined with associated connectors, the identification conductors interconnect all the output conductors, such that only a predetermined pattern of potentials other than the distinct patterns may be applied to the output conductors.

Abstract: Element insertion location apparatus (60) is connected to a completed first end (79) of a cable (80) to locate the position for inserting an element (82) attached to a conductor of the cable (80) in a cable connector (84) at the second end (81) of the cable (80). A power supply (64) energizes a plurality of electrical circuits each containing a light emitting diode (1 through 52). Each of the circuits is connected to one element of a cable connector (76,78). The completed first end (79) of a cable (80) is also connected to the cable connector (76,78). Upon placing an element (82) attached to a conductor at the second end (81) of a cable (80) into an element insertion tool (62) grounded (66) to a power supply (64) one of the circuits is completed illuminating a light emitting diode (1 through 52). The light emitting diodes (1 through 52 ) are in an array (86) that represents the physical arrangement of the element insertion locations in a cable connector (84).

Abstract: Improved telephone cable conductor pair identifier apparatus incorporates an "Expander" which is interposed at an appropriate location in the amplifier and filtering circuitry between the pick up probe and the audio signal emitter, or speaker. The "Expander" acts to accentuate the differences in the amplitudes of signals present, thereby significantly enhancing the effective sensitivity of a human operator to signal amplitude differences, with a resulting remarkable improvement in the ability of the human operator to readily and accurately locate and select a telephone cable conductor being sought. Switch means may be provided to permit the "Expander" to be bypassed at the will of the human operator, since it may be desirable to use the "Expander" only in the more difficult cases of conductor pair identification.

Abstract: A tester for conductors in a multiconductor cable which afford identification of the respective ends of each pair and tests each pair for shorts and opens. A transmitter unit for connection to one terminus of the cable and a receiver unit for connection to the opposite terminus of the cable. The transmitter has a plurality of integrated circuits forming a sequencer to apply in sequence a test signal to one end of each of the conductors. The transmitter has a power supply and there is a connection over a conductive path independent of the cable to connect the power supply to the receiver whereby the receiver is extremely compact. The receiver contains a plurality of light emitting diodes that constitute signal detectors, there being one detector for each conductor. The transmitter is supplied with controls for controlling the mode of operation of the equipment and for affording variation in the number of conductors that can be tested.

Abstract: An electronic test apparatus is provided for evaluating continuity of connections between the pin connectors of a supporting rack for printed circuit boards or the like. Circuit board racks have been provided to receive a plurality of separate modular circuit boards, each of which has a plurality of conductor fingers which fit pin connections or the like in the card (or board) edge connector at the rear of the circuit board supports. The pin connectors for each board are wired together in a selected sequence according to the circuit being constructed by the modules. The test apparatus consists of an electronic circuit including signal lights (LEDs) associated with each pin on card edge connector for the first board slot in the rack to be tested and separate electronic circuits including signal lights (LEDs) associated with each of the pins in each of the other slots in which board modules are to be inserted.

Abstract: A portable wire locator device for sequential identification of conductors within a cable includes a diode matrix board arranged with a plurality of wire-receiving terminals which are arranged into evenly spaced rows and columns, a plurality of lights arranged into a row of lights and into a column of lights and a source of electrical power. The source of electrical power is a battery and is coupled in parallel to the lights in the row and the lights in the column which in turn are coupled to the various wire-receiving terminals of the matrix board. Each wire-receiving terminal is coupled through a first diode to one light of the row and through a second diode to one light of the column so that each wire-receiving terminal corresponds to one and only one pair of lights. Similarly, each pair of lights corresponds to one and only one wire-receiving terminal.

Abstract: A test system for evaluation of a terminated cable harness examines both the correctness of cable conductor connections and the correctness of the load circuitry to which the conductors are connected. Electrical continuity testing is employed for conductor layout evaluation and transition circuitry is introduced between the continuity tester and the cable to accommodate parametric evaluation of the load circuitry.

Abstract: A cable testing apparatus and method are disclosed, the apparatus and method being particularly useful as a seismic cable tester to enable rapid cable check-out, and, as a battery operated portable unit, being particularly useful for final check-outs in field operations. The wires of a multi-wire cable are sequentially tested by pairs with sequential testing being interrupted and an indication of the pair of wires then found to be open being displayed each time an open is sensed. The apparatus includes electrical control circuitry for controlling multiplexing of the wire pairs of the cable to be tested and for determining the display to be presented so that the display is indicative of each pair of wires of the cable found to be open.

Abstract: A portable, compact test set for multi-pair cables having connectors, where the connectors are mated to adapters in the test set and pulses are generated which sequentially test each pair for open and short conditions, using transistor to transistor logic which provides a visual indication of the pair, the wire and the defect detected.

Abstract: A three wire leakage current testing circuit for determining the operational performance of ground fault circuit interrupter devices has parallel tripping leads connected to the output of a potentiometer adjustable to line voltage. One lead includes resistors, a potentiometer adjustable within a selected milliampere range and a milliammeter. The other lead has a timer the readout of which is digital and in terms of milliseconds. The leads are switch controlled so that one lead may be closed independently of the other or both leads may be closed simultaneously. The testing circuit may be plugged into or connected to an energized ground fault interrupter receptacle or circuit breaker and it includes switch controlled leads in which an external ground fault circuit interrupter device may be incorporated, the testing circuit then plugged into a conventional three wire outlet.

Abstract: Multipair cable testing apparatus for detecting transpositions and reversals in the cable pairs includes master unit (100) located at one end of the cable and remote unit (200) located at the other end.Master unit (100) comprises: pair address generator (120) for automatically and sequentially stepping through a grouping of pairs simultaneously terminated by master unit (100); sequencer (110) to sequentially connect, during each testing step, a pair under test to voltage measurement means (150) and then to resistance measurement means (160); indicator means (170) to display the results of the two measurements; and communicating means (175) to transmit the terminal address of the pair under test to remote unit (200).

Abstract: In an alarm system, differently colored leads of the connection cable between the individual distributors are respectively assigned to different current paths according to a random sequence. By providing this association, targeted manipulations at the connection lines of the signal lines are prevented.

Abstract: An installation for testing different types of cable sets, especially motor vehicle cable sets with interconnected conductors and with adaptors for non-fixed polarity, in which a shift register is provided with one output each for each individual conductor of each conductor connection; each output is connected with the input of the associated conductor or of the associated conductor connection and with a synchronizing line belonging to this conductor or the conductor connection.

Abstract: Apparatus is disclosed for storing the circuit conditions existing between a plurality of points established by the conductors of a "known" multiconductor harness and for comparing the circuit conditions existing between a plurality of points established by the conductors of a multiconductor harness to be tested with the circuit conditions of the conductors of the said known multiconductor harness.

Abstract: A microcomputer based system which provides a fast, error-free method of electrical harness fabrication and testing. Each connector into which the harness will be wired is mounted on a receptacle containing a multiplex transponder, a plurality of which are in turn connected in parallel through a common data cable to a controlling computer. A video display is provided for interaction between the operator and the computer. As each wire is connected between the appropriate connector pins, the computer, through the common cable and multiplex transponders, measures the connection resistance. Error messages and wiring information are displayed. Each multiplex transponder comprises a plurality of analog multiplexer/demultiplexer parts for connecting a common transmit data line in the connecting ribbon cable to any predetermined connector pin, and for connecting any connector pin to the common receive line of the connecting cable to allow testing the resistance between any electrical points.

Abstract: A testing and recording system is disclosed for determining and recording the cable pair-line equipment assignments in a telephone central office. Using a multipair shoe on the main frame appearances of the cable pair, an off-hook condition is simulated successively on each of a plurality of idle cable pairs. At the same time, the dial tone markers are monitored to determine which line equipment responds to the off-hook condition. If the off-hook test condition is of very brief duration and takes place during times of low central office traffic, there is a high probability that only one off-hook condition will occur during the test interval. If only one dial tone marker response occurs during this brief interval, the cable pair identification and line equipment identification are recorded to create a record of this assignment. Alternatively, a tone associated with each dial tone marker is detected to ascertain which marker responded to the simulated off-hook condition.

Abstract: An electronics assembly evaluator for evaluating the skill and knowledge of a prospective electronics assembler. The evaluator provides the assembler with considerable amount of work to perform in the fabrication of a test circuit and a wire harness while maintaining a completely safe electrical environment independent of the work performed by the assembler. The evaluator includes a device for determining the accuracy as well as the quality of the work performed.

Abstract: A specially configured cable, which, in use, has a cross section which is mmetrical to a vertical line, but asymmetrical to a horizontal line, is used for an intrusion detection system. It comprises an external sheath, which may be round or rectangular in cross section. An inner conductor is positioned below the center of the cable. It is supported in place by a thin, substantially flat, sheet of insulating material, which is attached to the inner surface of the outer sheath. This particular configuration maximizes the change in capacitance caused by an intruder passing over the cable. The cable is connected to a time-domain reflectometer, which can display on a screen the location of the intrusion with respect to an end of the cable as well as the probable type of intrusion.