Abstract: Proposed is a continuity tester for a plurality of electric conductors. For this purpose, a signal transmitter for admitting different individual identification signals to such conductors is connected to one of the ends of the conductors, whereby an identification is allocated to each signal transmitter connection. A signal receiver (10) for decoding the different identification signals by means of a decoding device (15) for indicating the allocated identification on a display (16) is connected to the other ends of the conductors. The signal receiver (10) has a sequence switchgear (30) supplying the connected conductors individually and successively with a reference potential in a repeated cycle, whereby the decoding device (15) for decoding the identification signals is formed at least on the one other conductor in each case.

Abstract: An inspecting device body (1) including an input terminal group (23), an output terminal group (24), a connection terminal group (25), a signal output portion (38), a signal input portion (39), first and second memory portions (40, 41), a comparing and determining portion (42), a lighting and flashing drive portion (44), and a control portion (48) is electrically connected to a work table (2) including an input connector (4), an output connector (5), LEDs (6), an earth plate (7) by one flexible printed wiring board (9), thereby reducing the rejection rate of wiring harnesses at assembly on an assembly line, allowing the final inspection of the wiring harnesses for acceptance or rejection, and improving assembly efficiency.

Abstract: An electrical test device for use by an electrician in testing circuits. The device includes a voltage sensor, display, and steady current source. The voltage sensor monitors the type of voltage (AC or DC) between the two conductors, and provides a signal to the display which responsively displays the type of voltage and the voltage level. The power supply has a steady current source that is in series with a tactile transducer, so that the test device may measure a broad range of voltages while only a limited amount of current flows through the voltage sensor. Consequently, lower cost components may be used in the voltage sensor. In another embodiment, the tester also includes a substantially independent continuity tester. The continuity tester includes its own power supply and alarm to indicate the continuity of a conductor and, thus, may operate even if the voltage sensor and display become inoperable.

Abstract: A plurality of cores of a multi-core cable are collectively conducted at first ends side thereof and are isolated from one another at second ends side thereof. The cores are engaged at the first ends side with grooves formed on a movable member one by one so as to be picked up and are sequentially transported toward an electrode. The picked-up core is cut during :its transportation so as to be electrically separated from a collective conducting part at the first end side. A high voltage is charged to the picked-up core through the electrode and based on an electric conduction characteristic of its charging current a judgment is made about whether there is a defective contact (dielectric breakdown) between the picked-up core and other cores. Further, the electric charge of the picked-up core is discharged, the picked-up core is recharged, and based on electric conduction characteristics of these discharging current and charging current a confirmation that the above judgment was not a misjudgment is made.

Abstract: An electrical test device for use by an electrician in testing circuits. The device includes a voltage sensor, display, and steady current source. The voltage sensor monitors the type of voltage (AC or DC) between the two conductors, and provides a signal to the display which responsively displays the type of voltage and the voltage level. The power supply has a steady current source that is in series with a tactile transducer, so that the test device may measure a broad range of voltages while only a limited amount of current flows through the voltage sensor. Consequently, lower cost components may be used in the voltage sensor. In another embodiment, the tester also includes a substantially independent continuity tester. The continuity tester includes its own power supply and alarm to indicate the continuity of a conductor and, thus, may operate even if the voltage sensor and display become inoperable.

Abstract: A connector formed with a first portion on the connector positioned differently according to a kind of the connector. The first portion is, for example, the forward end of a terminal or a cutout formed on the housing of the connector. At least one multicontact switch pin is fixedly arranged on a carriage base in a direction such that the probe pin of the multicontact pin extends towards the first portion. The switch pin has at least two contacts and a probe pin projecting outwardly of the multicontact switch pin. Each of the contacts is connected to a corresponding test circuit. The probe pin is adapted to move into and/or out of contact with the contacts when the probe pin is pushed inwardly into the multicontact switch pin. The carriage base is moved by a predetermined distance towards the connector to allow the probe pin to engage the first portion so that the probe pin moves into and/or out of contact with said contacts.

Abstract: A non-invasive testing system for video signals includes a jack having a monitor conductor connected across an amplification circuit to a central conductor. The amplification circuit amplifies the power of a signal drawn off of the central conductor such that the power level at the monitor conductor is substantially equal to the power level on the central conductor. When it is desired to test a power level of a signal being produced by a video source, test equipment is connected to the monitor conductor to permit non-invasive testing of the signal.

Abstract: To prevent entry of contaminants into a craft unit, each of a telephone signal connector (RJ11 jack) and DIN-type digital signalling link connector is replaced with a sealed, multi-pin plug/receptacle type connector which integrates the routing of both telephone communication signals and digital communication signals between the craft unit and an external device. When stored in a storage and battery-charging station, the craft unit is maintained in a communication-ready state, by providing each of the battery-charging holder and the portable craft unit with an additional multi-pin interconnect arrangement, that contains a charging path for the craft unit's internal battery, and a multi-pin signalling path. This multi-pin interconnect arrangement contains both a set of communication signalling pins and a set of terminal pins through which the internal battery of the portable craft unit is charged.

Abstract: A method and a device for determining the direction to a fault on a power transmission line in relation to a measuring station with the aid of phase currents and voltages, measured in the measuring station, by means of which change values .DELTA.U in the phase voltage, change values in the phase voltage .DELTA.UM of a line model and change values in the derivative .DELTA.I' of the phase current can be determined, and wherein for each measuring loop phase-ground the signal .DELTA.QL=(.DELTA.U-.DELTA.UM).multidot..DELTA.UI' is formed and if this value is smaller than a negative value assumed in advance, a fault lying ahead, in relation to the measuring station, has been detected, and wherein for each measuring loop phase-ground the signal .DELTA.QB =.DELTA.U.multidot..DELTA.UI' is formed and if this value is greater than a positive value assumed in advance, a fault lying behind, in relation to the measuring station, has been detected.

Abstract: A cable crosstalk measurement system provides fault diagnostic information to locates faults in addition to providing a crosstalk versus frequency function to test and troubleshoot LAN cables. In a preferred embodiment, a narrow pulse is introduced into one twisted pair of a standard LAN cable, and another twisted pair in the same cable is monitored for crosstalk signal coupling. A measurement system digitizes crosstalk signals using sequential sampling of repetitive signals to provide a waveform record that is a reconstructed equivalent time representation of a real-time crosstalk signal. A microprocessor performs a fast Fourier transform of the waveform record to provide crosstalk versus frequency information, while the waveform record is also examined for higher-than-acceptable amplitude levels to locate poor quality or faulty connectors and cables.

Abstract: The method is to detect a fault on a busbar and to specify the faulted point to a specific section of the busbar in order to provide a proper protection. If the fault has occurred, for instance, on a point P of a section between current transformer BCT- and a connecting point thereof to the busbar, or on a point Q of a busbar section between adjacent line outlets, the resulting fault current is expressed as a calculation sum of an output current of the current transformer BCT-. The foregoing current is zero in a normal condition, but in case of a fault, it reaches a definite value other than zero. Noticing this point, the fault current is computed for each section on the basis of the observable output current of the current transformer BCT-, and it is judged that if the foregoing current of a specific section exceeds a predetermined threshold, the fault has occurred on the above section.

Abstract: An instrument and method for the troubleshooting and verification of copper-wire local area network (LAN) cable systems provides a series of resistance and capacitance measurements between all possible wire pairs using a pair of switch matrices and a software method for evaluating the measurements which are stored in a two-dimensional matrix. The stored measurements are evaluated against predetermined figures of merit and the decision pattern in matrix form is compared to that of a known good LAN cable system. Error messages responsive to mismatches are generated and presented to the operator via a user interface. Near-end cross talk (NEXT) isolation is evaluated using a mathematically calculated differential capacitance technique. Error messages are generated responsive to difference capacitance values larger than a figure of merit correlated to an acceptable level of NEXT isolation.

Abstract: A universal cable connector includes a plurality of different sized connectors adapted to mate with the proximal connectors of different sized implantable stimulation leads. The cable connector attaches to a system analyzer and enables the system analyzer to interface with whatever implantable stimulation leads are connected to the connector block, thereby allowing the system analyzer to perform desired tests, such as threshold-determining tests, using the implanted stimulation leads. An adapter cable and clamp is also provided that allows an electrical connection of the proper polarity to be established between an implantable stimulation device, e.g., an implantable cardioverter-defibrillator (ICD), and the connector block while the implantable stimulation device is connected to a patient and is operating, thereby permitting the system analyzer to monitor the performance of the implantable stimulation device.

Abstract: In order to be able to check the wiring of buildings, in particular of control systems in buildings, in a simple manner, the present invention provides the measure of applying to all outputs or inputs of a switch cabinet which are provided with cables to be tested a digital address associated with the respective input or output. These addresses are associated with the respective field units, such as sensors or servomotors, in a reference list. For checking the wiring, the addresses of the inputs and outputs of the switch cabinet are read out at the field units via the cables connected thereto and, subsequently, they are associated with the respective field unit in an actual-address list. A comparison between the reference list and the actual-address list will then show whether there are any wiring defects and, if so, where these defects are.

Abstract: A termination control circuit is coupled to a far end of a cable. A modulated test signal is reflected back to a near end of the cable at a different frequency but at substantially the same level of attenuation as the test signal. Signal attenuation in the reflected signal is then measured to determine the amount of attenuation in the test signal. A second embodiment of the termination control circuit measures crosstalk by enabling and disabling termination resistors at the far end of the cable. A DC bias voltage located at the near end of the cable selectively turns on switching diodes to enable the termination resistor. Alternatively, both the attenuation and crosstalk circuits are combined together allowing both signal attenuation and crosstalk measurements with the same termination control circuit.

Abstract: A device for testing pairs of wires in a cable which includes a testing console having known means for performing tests on the wires and having a test fixture with a plurality of pins extending through a mating surface, the pins being arranged and arrayed to enter holes containing wires to by tested in a terminal fixture, the terminal fixture having holes into which wires may be inserted and held by friction, the holes opening in a terminal fixture having the holes in the same array as the array of pins in the test fixture so that when the terminal fixture and the test fixture are brought together with the same orientation the pins extending from the test fixture enter the holes in the terminal fixture and make a circuit between the testing console and the wire, and the console includes a rotating switch arrangement to bring both ends of each wire into circuit with testing equipment consecutively and one-at-a-time.

Abstract: A system for testing the integrity of critical circuitry, lines and wires employs a differential amplifier having an input resistance R.sub.in and a feedback loop with a resistance R.sub.fb. The critical wires being tested must be a signal wire series connected to a resistance R.sub.s, which is in turn series connected to a return wire. A test voltage source is connected to the noninverting input of the differential amplifier. The signal wire is connected to the inverting input of the differential amplifier. The test voltage source is activated by a test control unit. When activated, the test voltage source provides two distinct outputs allowing computation of a test gain in the presence of other functional signals. The test control unit measures the output V.sub.out of the differential amplifier and computes the value of the test gain. A break in either the signal wire or the return wire will result in a test gain of 1. If the signal and return wires are shorted, the test gain will be 1+R.sub.fb /R.sub.in.

Abstract: A pulse-based cable attenuation measurement system provides a measurement of attenuation characteristics of a cable over a wide frequency spectrum. A main test and troubleshooting unit of a cable test instrument applies stimulus signals via a selected one twisted pair in a LAN cable to a pulse receiver in a remote unit that in turn causes a pulse generator to produce a specified pulse of known amplitude and duration that is applied as a measurement pulse to a separate but adjacent twisted pair within the same bundle or cable. A measurement system analyzes the measurement pulse after it reaches the main unit, and provides attenuation versus frequency information to determine whether the amount of signal loss due to attenuation in the cable is acceptable or not.

Abstract: In a method for measuring transmission parameters of a balanced pair, a unbalanced type equipment which is widely used as compared to a balanced type equipment which is not used in practical is used. In the measurement, the balanced pair is connected to the unbalanced type equipment or via a unbalanced/balanced type transformer thereto at the measuring end, wherein predetermined terminated states are set at the measuring and far-ends to measure input admittances dependent on the terminated states. A characteristic impedance and a propagation constant for the transmission parameters are calculated from predetermined equations into which the measured input admittances are substituted.

Abstract: An inspection method and an inspection apparatus can readily and reliably test a temporarily bundled circuit in which each end of the wires 22A, 22B, 22C, 22D, and 22E is free. A temporary bunling connector 18 is coupled to an inspection connector 19. Each of the wires 22A, 22B, 22C, 22D, and 22E is drawn so that each of the terminals 21 passes between electrodes 11 in a gate electrode unit 5. Each of the indicator lamp 16 on a circuit checker 15 is respectively lit when each of the terminals 21 contacts with each of the electrodes 11 upon passing through the unit 5. The indicator lamp 16 is not lit if there is any fault such as misplacement or breakage of a wire, as there is no electrical communication between the terminal 21 and the electrode 11 in such a case.

Abstract: An improved cable fault detection system which makes the fault detection independent of the ground shift between units coupled to the interface. This fault detection is based on differentially sensing the voltage on a wire pair, in a cable, and using the differential voltage applied to the wires to make a decision as to whether or not the cable is faulted. The disclosed differential sensing and fault checking scheme reviews both data states thus making the fault detection independent of the ground shift between machines on the interface and this is accomplished without reducing the load impedance presented to the cable by the differential receiver coupled thereto.

Abstract: A device for testing current paths is attachable to a conductor. The device automatically checks the current paths of the conductor for continuity of a center conductor, continuity of a shield and a short circuit between the shield and the center conductor. The device includes a pair of connectors and a circuit to provide for testing of the conductive paths of the cable. The pair of connectors electrically connects the conductive paths of a cable to be tested with the circuit paths of the circuit. The circuit paths in the circuit include indicators to simultaneously indicate the results of the testing.

Abstract: A method and a device for determining the distance from a measuring station to a fault on a transmission line based on a fault model of a transmission network while taking into consideration the zero-sequence impedance and, where assuming a fault current, while taking into consideration the feeding of fault current to the fault point from both ends of the transmission line (FIG. 3 ).

Abstract: A LAN cable identifier for testing and identifying copper-conductor LAN cables in conjunction with a LAN cable test instrument is provided. Series combinations of resistors and diodes allow for both resistance measurements and polarity determinations for selected pairs of conductors of the LAN cable. Resistance values are chosen to allow for identification of each combination in order to diagnose wiring errors and to identify the particular LAN cable identifier. In addition, capacitance measurements are accommodated with minimal contribution to measurement error by careful orientation of the resistors and diodes so that the diodes may be reverse biased by a d.c. bias voltage provided by the LAN cable test instrument. The reverse biased diode junctions contribute only a small amount of shunt capacitance to the measurement.

Abstract: A device for determining interconnections between terminal positions at opposite ends of cable includes a test circuit, connectors for connecting the test circuit to the terminal positions of the cable and a connector for interfacing the test circuit with a computer.

Abstract: A household electrical service (10) is protected against overheating by running a sensor line or wire (36 or 38), coextensively together with hot, neutral and ground lines or wires (12, 13, 14 or 31, 32, 33), from a power company hookup (50) to a main breaker switch (18), and from respective branch circuit breakers (19) throughout the branch circuits (21, 22). The sensor line or wire (36 or 38) may be a length of heat fusible or otherwise temperature variant material which has a load end connected to ground and a source end connected to a control circuit (51) which trips the breaker (18 or 19) when an overtemperature condition melts the wire. Protection is extended through to individual devices (43) by continuing the sensor wire through the device cord (42). For this purpose, a plug ground prong (46) and receptacle ground prong connection (45) provide isolated ground and sensor wire connections.

Abstract: A cable testing system includes a far end unit for alternately connecting the wire ends at the remote end of a cable with either a resistive load including a plurality of resistors connected with the wires, respectively, or a source of a-c signals of different frequencies supplied to the lines, respectively. A near end unit connected with the ends of the wires at the adjacent end of the cable is operable during the resistive mode of operation of the far end unit to measure open-circuit and short-circuit conditions of the wires. During the frequency signal mode of operation, crossover between wires is mapped by the use of a differential amplifier, a full-wave rectifier an a slope detector circuit, to provide pulse width, cycle length and slope data for identifying the various wires.

Abstract: A micro-processor controlled apparatus for testing a network cabling. The apparatus is permanently installed at the network cabling site. The micro-processor controls a driver which sequentially provides a voltage carrying current to the individual conductors of each cable in the network. In this manner each conductor of each cable is tested. Hard-wiring and a shorting bar which disengages upon installation of a terminal apparatus provide the voltage carrying current with at least one current path at a remote network port. The voltage carrying current is returned from the remote network port on at least one conductor coupled to a receiver. The receiver samples a plurality of conductors, preferably for evidence of the voltage. In this manner, the receiver samples for the parallel return of a digital word. If the returned digital word agrees with an expected digital word stored in the memory of the micro-processor, an indicating device will signal proper wiring of the tested cable.

Abstract: A method and apparatus (3, 60, 202, 300) for measuring the dynamic, or alternating current, and static, or direct current, characteristics of a cable pair (2, 10, 24, 133) from one end, the local end, by utilizing an element (1, 19, 20) possessing known non-linear electrical characteristics connected across the other end, the remote end, together with methods and apparatus (30, 111) for connecting the non-linear element (1) across the remote end of the cable pair (2, 10, 24, 133) and disconnecting the non-linear element 11) by means of electrical voltages impressed across the cable pair (2, 10, 24, 133) at the local end. In the method and system of the present invention, the near end test set (3, 60, 202, 300) is electrically transposed to the far end of the cable pair (2, 10, 24, 133) making it appear, to be at the far end during the test while, physically remaining at the near end.

Abstract: A system for detecting the presence of and/or identifying wires at the first end of a cable comprises a signal generator for selectively applying an electrical signal to one or more wires at the second end of the cable. At least one electrode is provided for detecting the electrical signal at the first end of the cable and electronic circuitry evaluates the signals coupled to the electrode. The signal generator is an ac generator for delivering an ac square-wave signal and the electrode comprises a conductive tube of a predetermined length for inserting a wire at the first end of the cable. The wire is electrically insulated from the electrode such that the ac signal is capacitively coupled to the electrode.

Abstract: A wiring harness security inspection device having a cradle pivotally supported on a base is provided with a front socket for receiving a wiring harness connector and a rear socket for connecting the device to an electrical testing machine. After the connector is inserted into the front socket of the cradle, rotation of the cradle interlocks the connector to the base. The wiring harness cannot be used by an operator in production and installed and interconnected into an electrical circuit until the wiring harness is electrically tested and, when the harness passes inspection, a solenoid mounted in the base releases a latch permitting removal of the device from the connector thereby permitting use and installation of the wiring harness by the operator into the circuit.

Abstract: The present invention discloses a method of detecting and locating current imbalances such as ground faults in multiwire systems using the Faraday effect. As an example, for 2-wire or 3-wire (1 ground wire) electrical systems, light is transmitted along an optical path which is exposed to magnetic fields produced by currents flowing in the hot and neutral wires. The rotations produced by these two magnetic fields cancel each other, therefore light on the optical path does not read the effect of either. However, when a ground fault occurs, the optical path is exposed to a net Faraday effect rotation due to the current imbalance thereby exposing the ground fault.

Abstract: The invention relates to a method and a device for detecting a flashover between conductors in power transmission lines of different voltage levels suspended from the same towers and wherein the power lines are included in a power network where one of the power lines is stated to be a high-voltage power line (1) and where the other power lines are connected to the high-voltage line via transformers of a known transformer ratio (am) and internal impedance (ZXm) and wherein the line impedances (ZL) are known. Specific to the invention is that the fault current which is caused by a flashover is set to be equal to a detected current change in any of the phases in the high-voltage line. With this assumption an equation system can be set up with the aid of which the relative distance to fault n (0<n<1) can be determined. If the produced value of n lies within the stated region, this is interpreted as if an internal flashover has occurred.

Abstract: An assembly for protecting a conduit having a core and an axial length, which length is susceptible to being pinched by a structure is disclosed. The conduit includes an insulating coating in surrounding relationship about the core, with the assembly including a semiconductive layer in surrounding relationship about the insulating coating, and a switching layer in surrounding relationship about the semiconductive layer. The semiconductive layer being formed from partially vulcanized ethylene propylene rubber including particles of a conductive element in the form of carbon black, silver, nickel, aluminum or the like. The switching layer is non-conductive in its unstressed state and conductive when pinched such that the switching layer completes a current flow path between the semiconductive layer and either a grounded structure or another conductive layer, which condition may then be detected.

Abstract: A device for measuring and isolating noise-creating imbalances in a paired telecommunications line has an internal circuit which includes a pair of substantially balanced ac current outlet pathways and a pair of high voltage bias pathways in parallel. An oscillator in the circuit generates a low voltage longitudinal ac signal that is transmitted across the balanced pathways and a dc power source simultaneously generates a high voltage dc signal that is transmitted across the high voltage bias pathways. Both signals are further transmitted to the paired line where it is the function of the high voltage dc signal to punch through any concealed faults in the line. In contrast, the low voltage ac signal travels the length of each conductor in the line and returns to the circuit as a metallic voltage signal. If there is any imbalance between the two conductors, the metallic voltage signals for the two conductors will be different.

Abstract: A single hand-held tester performs both off-line continuity tests and on-line voltage tests for electrical cables and equipment such as that used in entertainment, studio or stage lighting. A test plug and a test socket fixed one at each end enable the tester to (a) plug into a power outlet socket to check for the correct presence of a.c. line voltage, (b) engage both ends of an extension cable to test continuity and correct wiring of each wire in the cable or (c) engage the plug end of an extension cable to provide audible indication of the continuity of a load such as a lamp connected to the cable. In a three-conductor (hot, ground and neutral) embodiment, a row of three test pushbuttons, one for each conductor, corresponds with an adjacent row of three LED continuity indicators. Three neon lamps indicate the presence of a.c. voltage between contact members of a power outlet under test.

Abstract: A multi-conductor cable tester and continuity analysis system having two groups of connector sockets wherein each group of connector sockets includes a plurality of different connector sockets designed to mate with the connector ends of the cable under test. An end of the multi-conductor cable is inserted into one cable socket from each socket group and the interconnection between the inserted cable ends is automatically determined by the system which interrogates each connected end of the cable separately, revealing unidirectional coupled data paths as may be provided with diodes or other electronic components. Additionally, the system compares the determined bi-directional continuity with previously stored cable continuity data corresponding to different, known cables and provides reference to one of the cables corresponding to the pre-stored cable data.

Abstract: A device for testing multi-wire harnesses, printed wiring board assemblies and card cages for wiring faults. The device comprises power and logic circuits in a housing, a fault indicator panel, a resistance balance circuit and a low voltage wiring test array. The wire harness is connected with both ends of the wires to sets of terminals on the wiring test array. In testing a wire harness, the operator grasps two probes which are attached to the resistance balance circuit and wipes them on the terminals of the test array. For test of printed wiring board assemblies or card cages, only one probe is required to contact the terminals on the test array. This action causes the resistance balance circuit to combine with the wiring test array segment and a wiring harness wire to form a voltage divider circuit which outputs voltage signals related to the wiring status. The device logic processes these signals and causes any fault indication to illuminate on the indicator panel.

Abstract: An electrical sensing circuit has a sensor device and an indicator such as a warning light. The system of the present invention continuously monitors the operational status of the sensing circuit. Normally open sensors are provided with a resistance across the open circuit contacts to provide a small leakage current. For each sensor, high and low comparators are provided. The high comparator is ground seeking and is used to detect closure of open circuit sensors, grounded connections and systems tests. The low comparator detects open circuits or high resistances such as might be caused by broken or loose wires, improperly connected sensors or electrically degrated sensors. The comparators drive logic components, which in turn drive indicators of circuit operational readiness.

Abstract: A machine for making and testing a cable harness assembly having planar, multi-conductor cable terminated to insulation displacement contacts housed in connectors. The machine includes a test module having a programmed microprocessing unit for executing the testing procedure. A series of manually operable switches are provided, the conditions of which are detectable by the computer. These switches are then set to indicate the number of contacts present in the connectors being terminated and to indicate which of these contact positions are to be tested. Additionally, the order of correspondence of the contacts of one connector to the other connector may be reversed by actuating a forward/reverse switch. The test module includes a learn mode, where a cable assembly of known configuration is placed into the machine. The test module then determines the continuity paths of the cable assembly and uses that information to test subsequently made cable assemblies.

Abstract: A control circuit for a cable tester having a computer interface and a cable adaptor. The latter comprises a current source having inputs from the computer interface and outputs to a first group of solid state switches having inputs from the current source and the computer interface and having outputs to an input of the cable adapter; a second group of solid state switches having inputs from the first group of solid state switches and the computer interface and having outputs to a first amplifier; and a third group of solid state switches having inputs from a fourth group of solid state switches and the computer interface and having outputs to the first amplifier. The fourth group of switches has inputs from an output of the cable adapter and the computer interface and has an output to ground, and the first amplifier has an output to the computer interface.

Abstract: An automatic harness testing apparatus test a multiconductor single connector wire harness for continuity faults in each conductive path of the wire harness by capacitively inducing an oscillatory test signal through the insulation of the conductors, probing each of the terminals of the connector and sequentially testing each probe for the presence of a test signal having a predetermined amplitude.

Abstract: The device of this invention includes a first revolving board having several indents in its circumference, a second revolving board having indents corresponding to those in the first revolving board, a photo sensor operated by the indents of the second revolving board, and a control circuit. The control circuit, upon receipt of output of the photo sensor, is operated to pause the stepping motor, turn it in the reverse direction up to a certain angle, and then again turn it in the original direction, so as to make a single core wire of a cable inserted precisely in an indent of the first revolving board.

Abstract: A fault detection circuit for testing conductor-to-conductor and conductor-to-ground faults in multiple conductor shielded cables. The fault detection circuit includes a voltage source that provides a plurality of distinct voltage phases. Each distinct phase from the voltage source is connected through a resistance and a logic circuit to an individual conductor in the cable. The resistance limits the current flowing through the fault detection circuit to reduce the risk of electrical shock to the operator. The logic circuit includes control relays which are responsive to phase-to-phase or phase-to-ground faults in the cable conductors. The logic circuit also provides a visual indication of a fault in the cable.

Abstract: A electrical transmission line termination device capable of performing various termination requirements including matching the line impedance of wires in a transmission line with load impedances, electrically connecting conductors in a transmission line for maintaining electrical continuity, detecting improper wiring of the various wires in a transmission line, and connecting a cable shielding conductor to a ground wire.

Abstract: A method and apparatus for detecting an improper connection of one or more cables to signal a cable misconnection error. On a board at one end of the cable there is provided a transmit circuit unique to one of the pins or sockets of the connector and at the other end of the cable at an opposite board there is provided a receive circuit that, when the cable is properly connected, receives the signal from the transmit circuit. A misconnection of the cable eliminates the signal from the transmit circuit thus signaling an error at the receive circuit. In addition, semi-dedicated connector positions are also employed so as to assure a detection of a number of different misconnections of the cable, particularly in a multi-cable system.

Abstract: The device checks the connection of the conducting wires of a bus such as a bus distributed in a local area network. It comprises two test modules to be connected to the terminations of the bus. The first module comprises a voltage source and detects electric discontinuities in the pairs of wires, and an abnormal crossing of two wires of one and other pair when the second termination is directly connected to terminating impedances of the bus. The second module signals a crossing of wire pairs and crossings of the wires within a pair. These different tests are carried out by working switches and their results are interpreted as a function of the activating and deactivating of current sensors such as LED.

Abstract: A leak detection system and method are disclosed. The capacitance of a leak detection cable is changed by a leaking liquid. A capacitance measuring circuit detects changes in the capacitance of the cable and thereby detects the presence of a leak. The capacitance measuring circuit includes an inverter, a current source, a comparator, and a timer. The inverter inverts a DC voltage to produce a mirror-image invented DC voltage. The current source produces a constant current proportional to the mirror image inverted DC voltage and supplies the constant current to the cable such that the cable is charged. A comparator compares the voltage across the cable to the input voltage and produces a match signal when they are equal. A timer which is responsive to the match signal measures the time required for the cable to be charged. The capacitance of the cable is directly proportional to the charge time.

Abstract: A hand-held apparatus for testing cable harness for faults and performance impairments comprises three sets of voltage references, CMOS comparator circuitry, programmable DIP switches, an LED status display for error detection, an LED for indication of overall system condition, and a power source. The voltage dividers are utilized to determine reference voltages; each voltage divider comprises a resistor pair. In the preferred embodiment a first set of voltage references is utilized for checking open conditions and is generally associated with odd-numbered wires in the cable harness. A second and a third set of voltage references may be employed for all types of testing, with the second set of voltage references being generally associated with odd-numbered wires and the third set of voltage references being generally associated with even-numbered wires.

Abstract: Versatile multiconductor cable test apparatus when connected to opposite ends of the cable indicates conductor defects (shorts and opens), reversal of conductors in sequentially connected cables, and identifies the location of a defective conductor or conductors. The apparatus can be readily operated by one person, is quickly connectable to the cable and is constructed with commercially available inexpensive parts.