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| Number | Title | Issue Date |
| 4923117 | Microcomputer-controlled system with redundant checking of sensor outputs A burner control system has a microprocessor for testing parameters of operation and for indicating deviations from a preset range for each. The sensors monitoring the parameters provide their outputs as analog voltages to analog to digital (A/D) converte... | 05/08/1990 |
| 4918374 | Method and apparatus for inspecting integrated circuit probe cards A method and apparatus for inspecting integrated circuit probe cards in which the probe points of the probe card are scanned across a checkplate having a conductivity transition border. The impedances between the probe points and the checkplate as they cr... | 04/17/1990 |
| 4897598 | Apparatus for electrical function testing of wiring matrices, particularly of printed circuit boards Apparatus for electrical function testing of wiring matrices, particularly of printed circuit boards. In the electrical function testing of wiring matrices, particularly of printed circuit boards, the number of required leads and switch elements can be dr... | 01/30/1990 |
| 4878025 | Trouble finder for testing an electrical system of a vehicle for short-circuiting A device for tracing preferably short-circuiting in electric systems. When tracing short-circuiting it is desirable that voltage and current will have normal values immediately after elimination thereof, for instance by contact. This object has been achieved i... | 10/31/1989 |
| 4866392 | Testing device for voltage testing of cables and cable sets A testing apparatus for testing with D.C. and charging a cable. Through periodically switchable switching elements, like a switch-over or a switching rotor, the cable alternately swings via a choke coil and rectifier into an opposite polarity and re-swing... | 09/12/1989 |
| 4862094 | Stroboscopic light circuit diagnostic system The self-contained diagnostic system is provided for a stroboscopic light circuit. The diagnostic system includes a plurality of signal lights, preferably LEDs, connected at various locations in the circuit to provide a visual indication of the faulty por... | 08/29/1989 |
| 4859932 | Multi-function tester A multi-function tester (10) for testing electrical continuity and detecting the presence of various types of voltages comprises a bistable flip flop (14) having set and reset input terminals (2, 6) which are driven by voltage changes thereat to change th... | 08/22/1989 |
| 4783631 | Apparatus for detecting disconnection of a speed sensor and eliminating oxide film from the sensor's connectors An apparatus for detecting a disconnection of a sensor by monitoring a signal in a signal-carrying line for receiving an output signal of the sensor through a connector. The apparatus includes a feeder circuit for causing a current to flow through the con... | 11/08/1988 |
| 4774470 | Shield tunneling system capable of electromagnetically detecting and displaying conditions of ground therearound In a shield machine, there are provided an electromagnetic wave transmitting and receiving unit mounted on the top of the shield machine for radiating electromagnetic impulse wave toward an underground and for receiving the electromagnetic wave reflected ... | 09/27/1988 |
| 4772806 | Switching device for a series loop circuit The present invention relates to a switching device for use in a series loop circuit, and more particularly to a switching device for uncoupling defective circuit components from the series loop circuit, for conducting quick trouble-shooting procedures to... | 09/20/1988 |
| 4733175 | Varistor defect detection by incipient hot spot observation Defects in varistors are detected by pulsing a high current through the varistors and shortly thereafter mapping the temperature distribution of a main varistor surface by heat sensitive equipment. The presence of a localized hot spot sufficiently higher ... | 03/22/1988 |
| 4714891 | Method and apparatus for improving the safety and extending the range of ionization gauge systems Different approaches are described, in ionization gauges or the like, which either prevent dangerous open ground conditions and/or sense the presence of the open ground whereby the controller power may be automatically turned off. Circuitry for extending ... | 12/22/1987 |
| 4713604 | Monitoring device for detecting faults in an electrical device, particularly in an LC filter circuit in an AC voltage network A monitoring device connected to an LC filter circuit for determining the occurrence of faults therein includes sensors for measuring the voltage drop across the LC filter circuit and the current flow therethrough. The monitoring device includes simulatio... | 12/15/1987 |
| 4713652 | Electrical apparatus An electrical apparatus for monitoring electrical continuity includes a number of input circuits each associated with a respective arm of a multi-phase rectifier circuit the continuity of which is to be monitored. Each input circuit includes a comparator ... | 12/15/1987 |
| 4707761 | Method and apparatus for detecting the rate of rise of direct current A low level fault condition in a mine trolley system is distinguished from a normal system load by detection circuitry connected to the trolley system between a main circuit breaker and the trolley wire. The detection circuitry monitors the current throug... | 11/17/1987 |
| 4705329 | Apparatus for electrical function checking of wiring matrices An apparatus for function checking of wiring matrices includes a carrier plate with a plurality of gas discharge channels formed therein. At least one selected measuring locations on a wiring matrix are ionically contacted through selected ones of the gas... | 11/10/1987 |
| 4697142 | Printed circuit conductor test system A system for testing conductor lines in a printed circuit board includes circuitry for the burning out of constricted regions of the printed circuit lines so as to insure that such defects are noticed. The system includes circuitry for measuring the resis... | 09/29/1987 |
| 4689546 | Internal armature current monitoring in large three-phase generator A three-phase generator includes an internal neutral junction to which one end of each of the windings of the generator is connected thereby forming a wye-connected generator. An air-core current transformer is disposed over each of the three conductors l... | 08/25/1987 |
| 4689573 | On-vehicle diagnostic unit for electronic ignition systems An on-vehicle diagnostic unit for an electronic ignition system monitors input signal received and output signals produced by the electronic ignition control unit on a continuous basis and displays an indiction of proper operation or failure. The failure ... | 08/25/1987 |
| 4680537 | Method and apparatus for testing a conductivity sensing circuit A method and apparatus for testing a circuit which senses the condition of an electrical quantity, the sensing circuit having a sensing portion which indicates a predetermined condition of the electrical quantity of a load connected between a pair of sens... | 07/14/1987 |
| 4678371 | Burying device for submarine cables and method for guiding the same A device for burying a submarine cable under water by easily and accurately detecting the cable position and a method for guiding the same by utilizing the characteristics unique to submarine cables, by supplying an AC only to the portion of the cable bet... | 07/07/1987 |
| 4658206 | Fault detector for communications equipment using exclusive or circuitry A fault detector is designed to detect abnormality of a transmission apparatus which transmits burst type signals such as a satellite communications equipment by wave-reforming the input and the output signal of the transmission apparatus, and executing a... | 04/14/1987 |
| 4638246 | Integrated circuit input-output diagnostic system Input and output fault monitoring circuits for determining the presence of integrated circuit chip open connections at the input and output pads of each circuit on a chip. The input fault monitoring circuit operates on the principle that if there is no in... | 01/20/1987 |
| 4513244 | Measuring and recording apparatus A measuring and recording apparatus for testing the operation of a home electrical appliance and the like comprises a multiscale electrical current recorder associated with a current probe for connection to a circuit in which the current value is to be mo... | 04/23/1985 |
| 4364007 | Unintentional impedance detection system A detection system for detecting unintentional impedances between the power conductors and a first node of either a power conversion circuit or a load, the first node typically being an earth ground. The circuit has power level lines utilizing a wye-conne... | 12/14/1982 |
| 4362986 | Method and means for monitoring faults in an electric power system and the like A selected point in an electric power system is monitored for subsequent fault analysis. The voltage and current at the point is continuously sampled with samples for a predetermined period of time being temporarily stored in memory. In response to a Faul... | 12/07/1982 |
| 4297633 | Electric fence monitoring system with energizer, responder and receiver Electric fences have been used for many years to control the movement of animals but where these fences have spanned large distances it has been very difficult to ensure that the fence is effective at the perimeters of the distance without continual super... | 10/27/1981 |
| 4272721 | Analog-to-digital converter alignment circuit A circuit for monitoring the alignment of analog-to-digital converters. The digital output signal from a converter under test is separated into positive and negative component signals which are compared by a subtraction circuit. A difference signal is the... | 06/09/1981 |
| 4159447 | System for detecting faults in the wall of a high-temperature pressure vessel A system for detecting faults in the wall of a high-temperature pressure vessel, such as a fuel gasifier. The wall comprises an outer metallic shell having an inner refractory lining, together with cooling tubes extending along the refractory lining. In o... | 06/26/1979 |
| 4155080 | Protective arrangement for analog sensor multiplexing system A protective arrangement operating in conjunction with a multiplexing system adapted to convey data from a plurality of low-impedance analog sensors to a central digital receiving terminal. Each sensor is coupled by an input line through a noise-rejection... | 05/15/1979 |
| 4096539 | Detector of backfeed electrical currents Apparatus for detecting current flow in any one or more of the three lines of a three phase electrical system which have been connected together by means having negligible impedance which comprises three current transformers which may be magnetically coup... | 06/20/1978 |
| 4086530 | Detection circuit for monitoring the failure of a system to respond in a planned manner to an inputted control signal A circuit for detecting the failure of a system to respond in a planned manner to a binary control signal includes a circuit for generating a check signal which normally changes in phase with the control signal. The failure detect circuit includes inverte... | 04/25/1978 |
| 4068105 | Central station system transmission apparatus Apparatus for transmitting signal information between central and remote stations in a central station system such as a central station alarm system. The transmission apparatus can continue to transmit information despite the occurrence of any of several ... | 01/10/1978 |
| 4056773 | Printed circuit board open circuit tester Open circuits are detected in printed circuit board conductors before components are mounted by means of contacting both sides of the board with flexible conductive test patterns connected to test circuits by decreasing below atmospheric the pressure abou... | 11/01/1977 |
| 4002972 | Electric vehicle control analyzer An analyzer for an electrical vehicle control system which includes a self-contained power source to allow excitation and evaluation of individual components in the control system. The analyzer plugs into the control system and includes a plurality of swi... | 01/11/1977 |
| 3937937 | Primary power fault detector Data processing and computer systems require continuous monitoring of the primary alternating current power. A power failure must be detected very quickly (within a fraction of a cycle), so that the contents of a volatile memory can be quickly converted i... | 02/10/1976 |
| 3935512 | Circuit for the compensation of current interference signals A circuit which compensates for interference signals when monitoring conditions such as overcurrents and the like in a larger network. The circuit includes a current-signal branch and a compensating branch, the latter fed with an interference voltage and ... | 01/27/1976 |
