Abstract: An intravehicular auto harness tester consisting of a first housing unit mountable within or upon the dashboard of a motor vehicle containing three small light emitting diodes with wiring one wire per diode leading thereto and then therefrom and ultimately as one wire to ground, coupled with one resistor per diode, with such wiring entering the housing unit and leaving it by way of a coaxial cable leading to a second housing unit located typically in the trunk of the vehicle with the wiring within the coaxial cable being connected within the second housing unit to each of three prongs one wire per prong and with one wire to ground via a female socket pocket all located at a front end of the second housing unit for purposes of interfacing with an intravehicular auto harness power plug.

Abstract: A polarity testing probe has a prod, a handle, an end cap, a wire, a cavity, first and second testing contacts, and a LED cartridge assembly. The prod extends from the handle. The end cap encloses the cavity within the handle. The handle is transparent through to the cavity. The wire extends from the end cap outside of the handle to a clamp. The first and second testing contacts are in the cavity and oppose one another. The first test contact is electrically connected to the prod. The second test contact is electrically connected to the wire. The assembly fits into the cavity with first and second assembly contacts to contact the first and second test contacts, respectively. The assembly has one LED connected to conduct and illuminate in one direction between the prod and the wire. The assembly has a second LED connected to conduct and illuminate in the opposite direction between the prod and the wire. The assembly has a transparent holder with wells to receive the LEDs.

Abstract: An extension cord with integral monitoring system including a male connector having a pair of strip contacts. Such contacts include a neutral strip contact and a line strip contact. Further included is a female connector having a pair of receiving contacts residing within a pair of apertures formed therein. The contacts include a neutral receiving contact and a line receiving contact. Further included is a cable coupled between the male connector and the female connector. The cable has a neutral wire electrically connected between the neutral strip contact of the male connector and the neutral receiving contact of the female connector and a line wire electrically connected between the line strip contact of the male connector and the line receiving contact of the female connector. Next provided is a voltage monitor for indicating the presence of a voltage at the contacts of the female connector thereby signaling that the male connector is in proper electrical communication with the electrical receptacle.

Abstract: A connector housing (22) before insertion of a terminal lug thereinto is set in an inspection chamber (7) on a connector inspection device (A), so that a movable pin (9) of an inspection pin (8) is located inside a front end portion of the terminal-accommodating chamber in the connector housing. With the terminal lug thereafter inserted into the accommodating chamber, the movable pin is moved back against a spring (11) so that, when the terminal lug has been fully inserted, the movable pin comes into contact with a stationary pin to energize an inspection electric circuit (18). Thus, the full insertion of the terminal lug (C) can be known. Hold on the terminal lug is then released to allow the terminal lug to retract by a distance corresponding to a clearance (D) present between an edge of a locking portion (28) of the terminal lug and a locking projection (24a) of a resilient locking piece (24), so that the movable pin is now separated from the stationary pin to shut off the inspection electric circuit.

Abstract: A testing instrument including a display element and two control paths that are separately activated. The display element has a display field shaped like a lightning bolt or zigzag and has at least three partial display fields which follow successively in a longitudinal direction of the display element. Each of adjoining partial display fields is connected to a different one of the two control paths.

Abstract: A faulted circuit indicator unit for detecting an abnormally high electric current in an overhead cable includes a substantially rectangularly-shaped housing formed of front and back walls, opposed side walls, a closed bottom wall, and an open top mouth portion. Current sensing circuitry is disposed in a cavity formed in the housing for detecting the high current in the cable. An indication device is joined to the closed bottom wall of the housing and includes a visible indicator responsive to the current sensing circuit to produce a visual flashing light in the presence of the high current which is visible through a small aperture formed in the bottom wall thereof. The indication device is formed of an opaque hood whose central portion is connected around the bottom wall of the housing and a transparent stem joined also to the central portion of the hood and extends downwardly therefrom through which the flashing light is transmitted radially outwardly in all directions.

Abstract: Apparatus for testing operation of a vehicle instrument panel that includes first and second electrical connectors each of predetermined connector configuration and each having a predetermined number of individually identified electrical contacts arrayed in identical series. An array of electrical switches is disposed on an operator panel, with each of the switches having a pair of switch contacts respectively connected to corresponding identically identified contacts of the first and second connectors. Each of the switches has facility on the operator panel responsive to an operator for selectively individually closing or opening each of the switches to interconnect or disconnect within the apparatus the corresponding connector contacts of the first and second connectors. A pair of single-conductor jacks are disposed on the panel adjacent to each of the switches, with each of such jacks being connected to a corresponding contact of the adjacent switch.

Abstract: A harness for testing a throttle position sensor having wires operatively connected therein terminating in a connector. The harness comprises a card and a first cable of multiple wires hard-wired to the card at one end and terminating in a connector at the other. The connector of the first cable is removably connectable to the throttle position sensor connector. The card further comprises a second cable of multiple wires hard-wired to the card at one end and operably attached to a connector at another end. The connector of the second cable is a mate for the connector of the first cable. At least two terminals are mounted on the card and connected between the wires of the first and second cables for connecting the card to a digital volt/ohm meter. A light is mounted on the card and connected between wires of the first and second cables to determine and visually indicate the continuity of the throttle position sensor wires. In another preferred embodiment, the first cable comprises a plurality of other ends.

Abstract: An electronic component failure indicator for clearly visably indicating on the surface of an electronic component to be tested a self sustaining indication of the functional operational status of the component. It is used for easily locating and identifying the exact used electronic component that has failed while it is still in a circuit and also later after it is removed from a circuit without the need of test equipment and electrical power. It includes an electronic testing circuit which continually monitors one or more parameters of the electronic component other than temperature. Upon a determination that one or more parameters has deviated from a normal condition, the test circuit generates an appropriate signal. This in turn causes a visable change in an indicator that is visable on the surface of the electronic component being monitored. In some embodiments, this may constitute a color change of the indicator, and in other embodiments, it may cause a bending or movement of the indicator.

Abstract: An ergonomically designed pistol grip voltage probe testing device features visual output indicators, such an LED light, as well as at least one additional or auxiliary indicator such as a buzzer. The LED advantageously changes colors depending on the potential applied to the probe conductor. Other auxiliary output feedback devices are disclosed. The device is particularly suitable for use in an automotive environment, and, in one embodiment, includes a cigarette plug adapter for connecting the device to a cigarette lighter receptacle for supplying output power and a ground reference potential to the test device.

Abstract: A computer system has dual-color LEDs for the LEDs conventionally indicating power on and hard disk drive activity, and a control circuit drives the LEDs in on-off and color combinations to indicate diagnostic information. In a preferred embodiment, a control circuit for controlling the LEDs is addressable as a port, and state combinations of the LEDs are set according to data sent to the port address of the control circuit. Also in a preferred embodiment, a POST routine for the computer system is divided into specific tests and groups of tests by commands configured to write a specific data string to a port address depending upon the position of the control command in the POST routine.

Abstract: An electrical test device for testing the function of a receptacle ground fault circuit interrupter. The tester plugs into a receptacle and includes a current source, timer, testing circuit, and display. The current source introduces a substantially constant fault current between the hot and ground leads of the receptacle. Once this occurs, the timer begins counting time and generates a time count signal. The test circuit receives the time count signal and determines whether the interrupter enters a tripped state within a designated time. The testing circuit responsively generates a trip indicator signal reflecting whether or not the ground fault interrupter circuit tripped within the designated trip time. The display means receives the trip indicator signal and responsively indicates whether the interrupter functioned properly by tripping the designated trip time.

Abstract: An auto harness integrity tester the components of which are respectively a housing unit protectively holding three male prongs extending from holes in one end thereof adjacent a female socket pocket in this end of the housing unit with wiring running from the prongs, one at a time to one each of three resistors and wiring running from each resistor to one each of three light emitting diodes from each of which a wire leads to a common wire leading to the female socket pocket such that when the instant device is plugged into the end plug of an auto harness, current can run from the harness through the prongs to the diodes and via a prong in the end plug received by the female socket pocket to ground.

Abstract: A radio speaker short circuit detection system for a vehicle visually indicates a speaker short circuit failure. A microprocessor receives a short circuit failure signal from a short circuit detection circuit. Short circuit failure data can be stored for future diagnostic retrieval.

Abstract: A device for finding an inoperative bulb in a series string of lights, such as a string of Christmas tree lights having a plug, a pair of electrically conductive leads connected to the plug and having their ends terminating within a casing of the device, a polarity switch having first and second terminals each connected to a lead of the pair of leads connected to the plug, a probe for insertion into and contact with the wire of the socket of the light string, and an indicator circuit for determining whether an electric current is passing through the series string thus indicating the presence or lack of an inoperative bulb. The indicator circuit is located between the polarity switch and the probe and a protective sheath is provided to prevent any part of the probe from being exposed to avoid a user from being shocked, the protective sheath being continuously biased to cover the probe.

Abstract: An auxiliary plug-and-socket assembly (28) has a plurality of pins (29) at one end which plug into a socket (30) at the rear end of a tractor vehicle (31) and sockets (32) at the other end which receive a plug (33) from a trailer vehicle. The auxiliary assembly (28) also has conductors (38) which extend between corresponding pins (29) and sockets (32), light emitting diodes (20-25) in respective circuits between conductors (38) and a common ground pin and socket, a gating diode (37), and an energizer (17) and switch (34) bridging the gating diode (37).

Abstract: A method and apparatus for detecting the possibility of transfer of material through a protective barrier between a worker and an external object and warning the worker of that possibility is provided. In one embodiment, an electronic leak alarm module is electrically connected to the worker and to the external object. In another embodiment, the module is connected to the worker and a conductive layer on or within the protective barrier.

Abstract: An indicating device for electric control units has a light-emitting diode together with at least two resistors placed between a supply voltage and ground. A control line extends from the control unit and is connected between the two resistors. The control unit controls the potential on the control line in such a manner that when a defect is recognized an indication is provided. An indication is also provided in the event of a short circuit between the control line and the supply voltage, as well as upon an interruption in the control line.

Abstract: An inductive amplifier for identifying and tracing wires includes a comb filter for nulling out 60 Hz. power line "hum", as well as harmonics of 60 Hz. The inductive amplifier includes a probe for sensing an input signal. The comb filter includes a time delay circuit for providing a delayed output signal that is delayed by 16.67 milliseconds, or one 60 Hz. cycle, compared to the input signal. The comb filter also includes an inverter circuit for providing an inverted output signal that is 180 degrees out of phase with the input signal. The comb filter further includes a summer for summing together the delayed output signal and the inverted output signal to null out harmonic components of 60 Hz. while passing other signals to the output of the comb filter. The nulling method may also use digital processing techniques rather than discrete circuit components.

Abstract: An inductive amplifier for identifying and tracing wires includes an automatic gain control feature for sensing the connection of butt set leads to the inductive amplifier and reducing the gain of the inductive amplifier in such instances to reduce the likelihood of instability or oscillations. The inductive amplifier includes a probe for sensing an input signal which is filtered and amplified for driving either an internal speaker or a speaker in the earpiece of an external butt set. The inductive amplifier includes circuitry for sensing that the leads of the butt set have been connected to the inductive amplifier, and for reducing the gain of the inductive amplifier by a factor of ten under such circumstances.

Abstract: A coaxial cable testing and tracing device including a plurality of cable terminator plugs each having a characteristic impedance; an electrical testing circuit further including a coaxial cable connector coupleable to an end of a coaxial cable, a signal generating mechanism coupled to the cable connector for generating and transmitting a plurality of characteristic signals with one of the signals indicating an open circuit condition at the cable connector and with the other remaining signals indicating that a coaxial cable coupled to the cable connector has been terminated with a cable terminator plug, and a display mechanism coupled to the signal generator mechanism for receiving a signal therefrom and based on this received signal providing a visual indication of when a coaxial cable coupled to the cable connector has been terminated with a terminator plug and further providing an indication of an open circuit condition at the cable connector; a power supply mechanism for supplying electrical energy; and a

Abstract: A testing kit for luminaire lamps includes a shorting cap that is to be substituted for a photoelectric sensing device to test its operability, and a luminaire lamp testing instrument that is to be used while the shorting cap is in place for testing the operation of the starter and the ballast associated with the luminaire. The shorting cap includes a plurality of equidistantly distributed indicating lights to enable the user to see one of them from any angle, a built-in circuit breaker that trips when there is a short circuit downstream from the photoelectric sensing device, and a pair of jacks for connecting a voltmeter thereto. The luminaire lamp testing instrument has an evaluation circuitry that determines whether or not the starter or the ballast function properly and causes either one of two lights, depending on the design wattage of the luminaire lamp, to issue visually distinguishable signals indicative of proper operation of the starter and the ballast, respectively.

Abstract: A continuity/leakage tester for cardiac catheter probes of the type having plural spaced surface electrodes thereon. The apparatus includes a block having an open ended blind bores provided therein sized for receiving catheters of different diameters. A port is provided in the bore or bores adjacent the opened end and a spring loaded electrical contact provided therein which is grounded. Four plural bores are provided in the block, a common electrical conductor bar extends transversely across the ports which are formed at a common longitudinal station on each of the bores. The catheter is inserted in the bore and as each surface electrode contacts the spring biased electrode in the bore, a continuity test may be performed by an ohm meter connected to the probe lead for that particular surface electrode. As each subsequent surface electrode on the probe enters the bore, its corresponding electrical lead may be switched to the ohm meter for continuity testing of that electrode.

Abstract: A fluid detection system capable of detecting the smallest amount of liquid chemicals, mixtures, aqueous solutions, pure water and others by detecting very low levels of resistance or conductance due to ionization when the liquid substances are subjected to very small amounts of electrical power in a small and localized sampling area. The system includes an electronic control module and a sensing probe. The control module provides strictly limited and controlled amounts of electrical voltage and current to one or more remotely located sensing probes which detect the level of resistance or conductance between two electrodes (gold pins) disposed at a fixed distance from one another. The voltage developed across the electrodes is input to a comparator circuit in the electronic module and compared to a reference to produce a signal defining either a dry or a wet (leak) condition of the sensing probe. This signal can be utilized to generate shutdown signals and/or audible and visual alarms.

Abstract: A novel apparatus for determining the location of an inoperative bulb in a series circuit of decorative Christmas tree type light bulbs is provided which comprises a housing member having an opening adapted to accommodate the physical insertion therein of each of the light bulbs to be tested while in said series circuit. An elongated electromagnetic radiation shield is fixedly secured within said opening and along the inner peripheral surface thereof and an elongated electro-magnetic radiation receptor is fixedly secured along the inner peripheral surface of said shield and insulated therefrom and adapted to intercept electromagnetic radiation which is radiated from a light bulb inserted therein. A battery operated audio amplifier is mounted within said housing and has an input terminal and an output terminal. An energizable signal indicator is fixedly secured to said housing.

Abstract: A solenoid type voltage, polarity and continuity tester has a solenoid operated voltage indicator, and separate positive polarity, negative polarity and continuity indicators. In the circuit for the tester, the solenoid is arranged in series with the polarity and continuity indication circuits so that continuity of the solenoid can be verified when the continuity of a circuit being checked is positively determined. A polarity indication circuit is in parallel with a continuity indication circuit. The continuity circuit has a battery which is switched into a circuit having a high resistance when a voltage is applied to the tester to reduce battery drainage.

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: The present invention provides a continuity tester suitable for testing different types of devices and circuits wherein first and second members are hingedly connected together, the first and second members each having an electrically conductive surface element associated therewith, the arrangement being such that the conductive surface element of the first member is connected to a negative side of a test circuit and the conductive surface element of the second member is connected to the positive of a test circuit and the first and second members then assume different angles with respect to each other to enable many different devices to be tested through manipulation of the first and second members.

Abstract: A method and apparatus for detecting the possibility of transfer of material through a protective barrier between a worker and an external object and warning the worker of that possibility is provided. In one embodiment, an electronic leak alarm module is electrically connected to the worker and to the external object. In another embodiment, the module is connected to the worker and a conductive layer on or within the protective barrier.

Abstract: A tester for individually testing diode packages, double pole relays and single pole relays includes a circuit contained within a housing, which circuit connects the diode package or relay being tested to a source of 12-volt direct current and transmits the direct current through the diode package, or relay, to an array of indicator lamps under the control of one normally open and two normally closed switches. A forward and reverse bias switch controls the direction of current through the diodes of the diode package and the internal diode of the relays to determine if the diodes and internal diode are oriented properly and conduct current properly.

Abstract: A device for detecting the presence of an electric current in a conductor having a elongate hollow tubular body defining a handle, an electrically conductive blade having a sharpened edge attached to and extending from one end of the handle, an electric lamp visibly housed within the handle and electrically connected to the blade and a ground wire electrically connected to the lamp and including a clamp for secured attachment to a ground. The sharpened edge of the blade is specifically structured and disposed for cutting through the insulation of a wire conductor for conductive contact therewith whereupon the presence of an electric current through the conductor will illuminate the lamp in the handle of the device.

Abstract: A trailer lamp testing and lamp storage apparatus is provided for connecting to an electrical connector of a trailer, wherein the electrical connector of the trailer has a predetermined number of contacts for a predetermined number of lamp circuits in the trailer. The lamp testing and storage apparatus includes a housing assembly which includes a bottom housing portion, a hinge assembly connected to the bottom housing portion, and a lid assembly connected to the hinge assembly. A storage assembly, supported by the housing assembly, is provided for storing a number of replacement lamps for replacing burned out lamps in the trailer. The lamp testing and storage apparatus also includes a predetermined number of battery-powered testing circuits and a connector assembly for receiving respective ends of the predetermined number of testing circuits.

Abstract: A cardiac catheter testing apparatus having a support structure including a plurality of receptacles adapted to removably receive a first probe of an electrical continuity measuring device. The support structure also includes electrical contact prongs adapted to removably receive the connective end of a cardiac catheter, which catheter has at least one electrode at the end of the catheter substantially opposite the connective end. The testing apparatus also includes electrical contact elements electrically connected to the receptacles to form an electrical path between the first probe when inserted in one of the receptacles, the electrical contact elements and the signal generating electrode. A second probe is electrically connected to the electrical continuity measuring device which displays a value indicating the presence or absence of electrical continuity between the electrode and the connective end of the catheter when the second probe is brought into contact with the electrode.

Abstract: Portable gas sensing devices practicing the present invention include a fault protective battery cap to interrupt flow of battery current exceeding a preselected-threshold level. In normal operation, the battery cap is engaged with a compartment of the gas sensing device which maintains the battery used to power gas sensing circuitry therein. When installed in the gas sensing device in this manner, the battery cap defines a current path from at least one terminal of the battery to internal gas sensing circuitry. As with prior art battery caps, the battery cap of the invention is removable to facilitate replacement of the battery. Unlike prior art battery caps, however, battery caps constructed in accordance with the invention include a fuse electrically connected interposing the current path. The fuse functions to interrupt current flow from the battery if the current exceeds a preselected threshold level.

Abstract: A multi-test, hand-held instrument and method for testing manifold absolute pressure (MAP) and mass air flow (MAF) sensors includes a housing enclosing a battery and an electrical circuit. The electrical circuit can test d.c. voltage output signals and frequency output signals from MAP/MAF sensors and can test continuity and battery strength. Electrical leads extend outwardly from the housing and are connectable to the sensor being tested. A pair of light indicators, comprising LEDs and resistors connected in parallel, are selectively illuminated to allow the test instrument to be used to test both MAP and MAF sensors, and to test these components on different makes and models of vehicles.

Abstract: A dynamic fuse testing device includes an elongated handle, a head pivotally mounted to the handle, a fastener for tightening the head relative to the handle to place the head and handle at a desired angular position relative to one another, a pair of elongated electrically conductive test probes for contacting opposite ends of a fuse, a pair of mounting members attached in spaced relation to one another on the head, the mounting members having respective outer ends mounting the respective probes, one of the mounting members being stationarily mounted on the head and the other of the mounting member being rotatably mounted on the head such that its outer end is pivotally movable toward and away from the outer end of the one mounting member for adjusting the distance between the probes to accommodate fuses of different sizes, and a lamp and battery on the head connected in series with the probes such that the lamp is illuminated by contact of the probes with a properly functioning fuse.

Abstract: A megohm tester for determining resistance utilizing a relaxation oscillator which generates output pulses, at a rate dependent on an unknown resistance detected at a test site within an electronic apparatus, which can then be compared to known values provided as standards.

Abstract: A load indicating socket tester includes a base and an annular sidewall. A plurality of pairs of line and load terminals are mounted in and extend outward from the base for removable insertion into electrical contact with jaw terminals in a watthour meter socket. A cover closes an open end of the side wall of the housing and has fuses, lamps, an amp meter, and a lamp test switch mounted thereon. The fuses and lamps are preferably provided in pairs and electrically connected with the lamp test switch such that the switch, when in a first position, connects each lamp in parallel with one of the fuses and, when in a second position, electrically connects each lamp in series with one of the fuses to test the operation of each lamp. A current transformer is mounted within the housing and detects the current drawn by a load when the socket tester is mounted in a watthour meter socket.

Abstract: A multi-test, hand-held instrument and method for testing engine sensors and ignition modules includes a housing enclosing a battery and an electrical circuit. The electrical circuit includes a first test circuit electrically interconnected with said battery for testing potentiometer-type, temperature-type and Hall effect type sensors and ignition modules, a second test circuit electrically interconnected with the battery for testing oxygen, reluctance and knock sensors, and a third test circuit for testing the battery in the instrument. A first switch selects between the first or second test circuits, while a second switch selects between a component testing mode and a battery testing mode. Electrical leads extend outwardly from the housing and are connectable to the engine component being tested.

Abstract: Portable and disposable apparatus for leak testing surgical and/or examination gloves which may be worn on the body of the user to permit convenient detection of glove leaks during diagnostic procedures. In one embodiment there is provided an electrolyte-containing pouch worn on the body of the user and into which gloved hands may be inserted for evaluation. A leak in a glove permits the electrolyte to penetrate the glove and contact the skin of the wearer to close an electrical circuit and trigger an alarm.

Abstract: An electrical test buzzer is adapted for insertion into an output receptacle and used to test for the presence of electricity at the output receptacle. The electrical test buzzer includes an audible alarm, a transformer, held in a housing, and a pair of contact prongs. The contact prongs are inserted into a respective output receptacle causing the buzzer to sound a high pitched alarm when electricity is present at the receptacle. When no electricity is present at the receptacle no circuit is formed and the alarm does not sound.

Abstract: Apparatus for determining which bulb or bulbs in a string of miniature incandescent light bulbs is burned out. The apparatus includes a socket adaptor with wire contacts at the base thereof for making conductive contact with both circuit contacts in the base of a selected bulb socket in the light circuit. Light emitting diodes are located within the adaptor body between each wire contact and a junction connected to one contact of a battery. The other contact of the battery is connected to both contacts of a female receptacle body. The male plug of the light circuit is inserted into the female receptacle of the socket adaptor, thus placing both ends of the string of bulbs in connective communication with one contact of the battery. The diodes are located in the socket adaptor body so that when either diode lights up, the direction in the light circuit of the inoperative bulb is indicated.

Abstract: A tester is provided for a control yoke of an oil-filled electrical power switch. The tester can be easily and safely used by a line crew member. The tester is connected to the yoke which carries electrical signals to control the position of the switch. Control signals are then furnished to the yoke in the usual manner. Indicators on the tester identify whether the yoke or the switch is the source of the problem.

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 device for testing the polarity of both a power supply and a test element such as a circuit, wire or the like. The device is comprised of a body which contains a circuit board, a probe extending from one end of the body, and two lead wires extending from the opposite end of the body. The device will work on any DC voltage supply having a voltage from 6 volts to 24 volts.

Abstract: An electrical resistance and insulation tester providing a 12 volt D.C. and a 500 volt D.C. testing circuit. Indicating means are comprised of an incandescent bulb for the 12 volt D.C. test circuit and a neon bulb for the 500 volt D.C. test circuit. A 12 volt D.C. power input circuit and a 110 volt A.C. power input circuit provide for operation at either input. The tester also comprises a chargeable capacitor circuit that allows for testing when the instrument is not connected to any power input source.

Abstract: A lighted wire nut made operable by connection of the ends of an energized wire conductor is used to troubleshoot circuits by detecting a voltage drop with respect to ground when present in the circuit.

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: An apparatus for testing different electrical sensors used in machinery includes first, second and third insulated conductors, a grounded connection, a power supply, a low signal detector, a high signal detector, a varying signal detector, and an indicator. The first and second conductors are connectible to sensor under test to respectively conduct ground and supply voltage signals to the sensor. The third conductor is connectible to the sensor under test to conduct an input voltage signal from the sensor to the low, high and varying signal detectors. The low signal detector compares the input voltage signal with a low voltage reference signal. The high signal detector compares the input voltage signal with a high voltage reference signal. The varying signal detector compares the input voltage signal with a positive voltage reference signal. The low, high and varying signal detectors produce output signals of either first or second states which are received by the indicator.

Abstract: A tester for power operated vehicle antennas is designed to be inserted serially within the power antenna's operating circuit and utilizes light emitting diodes to indicate proper circuit operation. A flexibly positionable fiber optic cable can also be utilized to permit the viewing of illuminated diodes from a remote location.