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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 7847562 | Method and apparatus for detection of resistive fault conditions A resistive fault condition detector for conducting one or more tests of a circuit to detect a resistive fault condition. The detector includes means for determining changes in current through a load during the test, and means for measuring changes in first and seco... | 12/07/2010 |
| 7719287 | Systems and method for monitoring information handling system interfaces through cables having plural links A port width module operating in association with SAS controllers determines the operational state of communication across an SAS cable by comparing the number of links at opposing controllers that are capable of supporting communication with the number of links in ... | 05/18/2010 |
| 7339379 | Method of and apparatus for determining if a buried current carrying conductor is buried above predetermined minimum depth A detector 1 for detecting a current carrying conductor has a pair of vertically spaced antennae 3, 5 to detect the magnetic radiation produced by a current carrying conductor as a result of one or both of the mains power supply or an electromagnetic s... | 03/04/2008 |
| 7340365 | Method and apparatus for verifying the operation of a plurality of test system instruments In a method for verifying the operation of a plurality of test system instruments, a harness cable is electrically coupled to a plurality of test signal ports on the plurality of test system instruments. A first plurality of test measurements are then initiated via ... | 03/04/2008 |
| 7336061 | Group wiring system allowing locating of wire pairs and method for locating wire pairs in group wiring system A group wiring system includes a hub of a server system, a distribution frame including a plurality of wire pair receptacles, a plurality of remote receptacles, a testing device, and a plurality of testing circuits. Each testing circuit is coupled between conductive... | 02/26/2008 |
| 7321661 | Current feedback system for improving crossover frequency response A loudspeaker is provided for receiving an incoming electrical signal and transmitting an acoustical signal. The loudspeaker may include a power amplifier that has an input and an output, where the input receives the incoming electrical signal. The loudspeaker may a... | 01/22/2008 |
| 7304481 | Apparatus for testing electric cables In one preferred embodiment, an apparatus for testing a cable includes an interface for connecting to a connector of the cable, many resistors, a socket, and a meter for testing resistance of the resistors. The interface has many pins, the resistors respectively con... | 12/04/2007 |
| 7282925 | Apparatus to facilitate functional shock and vibration testing of device connections and related method An apparatus and associated method are disclosed for facilitating the testing of device connections, including functional shock and vibration testing of peripheral card slots or any other desired connector interface. In part, a power supply located on the peripheral... | 10/16/2007 |
| 7242178 | Digital cable toning apparatus and method A digital toner/locator employs tone packets using a 455 Khz. carrier. Plural packet quanta provide multiple test modes which are advantageously selected from a probe without requiring returning to the tone generator to change mode. A locate and isolate mode are pro... | 07/10/2007 |
| 7235980 | Cable detection apparatus and method A cable detection apparatus is disclosed having a filter, the filter transmitting components of a signal detected substantially at certain harmonics of a first frequency. The filter may also attenuate the signal at certain even harmonics thereof. A method of detecti... | 06/26/2007 |
| 7116112 | Apparatus for testing electric cables A cable test apparatus includes a power supply terminal, an open circuit indicator with an anode connected to the power supply terminal, a short circuit indicator, a first interface, a second interface, and a switch. The first interface and the second interface have... | 10/03/2006 |
| 7102399 | Low-noise frequency divider A multi-modulus divider for producing a low-noise divided output, wherein one embodiment comprises a low-noise frequency divider comprising a pulse-swallow configured divider module and first, second, and third latching blocks. The pulse-swallow configured divider m... | 09/05/2006 |
| 7046157 | Short circuit detector for shield conductor in a fieldbus network A short circuit detector for a fieldbus network which includes power/data wires that are typically positive and negative, respectively, and a shield conductor connected to a ground includes first and second high-impedance semiconductor circuits coupled between each ... | 05/16/2006 |
| 7030623 | Electrical short tracing apparatus and method A vehicle testing apparatus and method which facilitates tracing and isolating of short circuits. The tester preferably provides a user-selected constant current level (i.e. 1, 3 and 6 amperes) for driving a vehicle short under test at a constant current level compa... | 04/18/2006 |
| 6995570 | Method and apparatus for detecting conditions in paralleled DC power cables To provide protection for power supplies in which a plurality of paralleled identical DC power cables are provided between a source and a load, one aspect of the present invention provides a method for detecting conditions in parallel DC power cables. The method inc... | 02/07/2006 |
| 6977508 | Cable detection apparatus and method A cable detection apparatus is disclosed having a filter, the filter transmitting components of a signal detected substantially at certain harmonics of a first frequency. The filter may also attenuate the signal at certain even harmonics thereof. A method of detecti... | 12/20/2005 |
| 6975312 | Computer system having network connector and method of checking connection state of network cable therefor A computer system having a network connector to which a network cable is connected, including a displaying part displaying a connection state of the network cable; a signal processing part processing a signal inputted through the network connector; and a control par... | 12/13/2005 |
| 6963192 | Device for tracing electrical cable A device for tracing electrical cable. The device allows a cable installer or service person not only to identify one wire or cable in a group, but to simultaneously remotely identify as many cables as he desires. The device requires only that the installer connect ... | 11/08/2005 |
| 6940289 | Method and apparatus for tracing a line A method and apparatus includes a signal generator, a power supply, a micro-controller a transmitter and a receiver for determining the condition of a line. The signal is passed through the line and any reflection is used to determine varying characteristics of the ... | 09/06/2005 |
| 6906505 | Device for visual identification of cables or conduits The invention provides a device for accurately locating ends of cords, wires cables or conduits, in particular in the fields of electricity, electronics, telephone and computer. The device includes an optical fiber disposed on a cord and extending from a first end t... | 06/14/2005 |
| 6844712 | Multi-test circuit breaker locator having a transmitter and a receiver A system for locating a circuit interrupter associated with a selected branch circuit. The system includes a passive transmitter that creates a current spike at a predetermined frequency and a receiver broadly tuned about that predetermined frequency. The current sp... | 01/18/2005 |
| 6744255 | Grounding device for electric power distribution systems A grounding and testing device for power distribution systems includes an electrically insulated housing with a bore that extends from an aperture at a front of the housing towards a rear of the housing. An electrical contact is disposed at least partially within th... | 06/01/2004 |
| 6737871 | Non-invasive cable tester The present invention is a non-invasive cable tester. The cable tester comprises a sensor for detecting an electric field emitted by a live electric cable. The resulting signal from the sensor is then filtered, amplified, and compared to a threshold value to determi... | 05/18/2004 |
| 6707305 | Tone generator and probe The tone generator uses a highly accurate frequency signal to generate an accurate and stable tone signal. A cadence pattern may be used to output the tone signal onto a test cable in an easily distinguishable pattern. The tone signal may be selectively output at an... | 03/16/2004 |
| 6639412 | Coaxial cable voltage test indicator The present invention has a coaxial cable connection electrically connected to a voltage monitor circuit for discriminating between multiple voltage levels. A visual display is electrically connected to the voltage monitor circuit and which displays the m... | 10/28/2003 |
| 6608487 | Contact-connecting safety-monitored synthetic fiber ropes A contact-connecting device connects more than two indicator fibers in an electrically conducting manner to create a conducting connection of the indicator fibers at the end of a safety-monitored synthetic fiber rope made from electrically insulating synt... | 08/19/2003 |
| 6538452 | Device for testing coaxial connectors A testing device provides pin height, continuity, and concentricity testing for coaxial connectors and cables. The testing device provides connector jacks with support shafts that properly align and stabilize the connectors during testing. Circuitry is pr... | 03/25/2003 |
| 6531880 | Non-invasive cable tester The present invention is a non-invasive cable tester. The cable tester comprises a sensor for detecting an electric field emitted by a live electric cable. The resulting signal from the sensor is then filtered, amplified, and compared to a threshold value... | 03/11/2003 |
| 6486677 | Conductivity testing method for a sub-harness and a sub-harness manufacturing apparatus A conductivity testing method for a sub-harness and a sub-harness manufacturing apparatus are provided, which sub-harness manufacturing apparatus includes: a pair of connecting units each having a wire connecting portion, made of metal, vertically movable... | 11/26/2002 |
| 6466033 | Self powered DSL port continuity checker An apparatus for verifying port and slot assignments of cable bundles that extend from a telephony filtering device, including Digital Subscriber Line (DSL) infrastructure. The apparatus may have a circuit board that inserts into a vacant slot of a frame ... | 10/15/2002 |
| 6459274 | Methods and apparatus for testing electrical connections Methods and apparatus are presented for determining the adequacy of a shielding and an electrical connection of a male BNC to a coaxial cable. A dial indicator gauge includes a calibration member for calibrating the limits of a properly connected male BNC... | 10/01/2002 |
| 6448779 | Wiring test assembly A wiring test assembly for validating and troubleshooting electrical problems with vehicle wiring assemblies for trailers. The wiring test assembly includes a housing with a bottom portion hingedly coupled to a top portion, a plurality of indicator lamps ... | 09/10/2002 |
| 6437580 | Cable continuity tester and tracer A cable continuity tester and tracer includes a cylindrical barrel housing a battery, a cable connector with two contacts, a bicolor LED and a detachable, tone-generating portion. A circuit board in continuity with the battery, LED and both contacts of th... | 08/20/2002 |
| 6356084 | Audio testing system A cable tester is provided having a receive unit comprising a cylindrical housing with open ends, a connector which is attached to one open end, and a plurality of light-emitting diodes (LED's) which are mounted within the other end and are electrically c... | 03/12/2002 |
| 6344748 | Coaxial cable connector testing methods and apparatus A terminator plug is connected to one coaxial cable connector and a coaxial cable connection tester is connected to the other cable connector. A voltage is applied to the cable's center conductor and a ground to the cable's shield. The center conductor vo... | 02/05/2002 |
| 6341358 | Integrity tester for parallel signal bus A parallel data bus tester is particularly applicable to SCSI type buses, and uses a plurality of comparator circuits to simultaneously examine the voltages present on the conductors of a bus cable. For twisted pair type conductors, the tester uses a high... | 01/22/2002 |
| 6323652 | Electrical testing device An electrical testing device for determining the continuity between ground terminals of an electrical power cord and determining the electrical grounding of an electrical power tool. The electrical testing device can also be configured to determine the pr... | 11/27/2001 |
| 6262654 | Audible alarm-wire identifier Device for identifying multiple two-conductor alarm wires originating from a common location but terminating at individual remote locations. This device is utilized at the common location by connecting a plurality of test leads and common leads to wires t... | 07/17/2001 |
| 6236218 | Method and a device for space-charge measurement in cables using a pulsed electroacoustic method A method for space-charge measurement in a coaxial cable comprising an inner conductor (2), a cable screen (3) and an electric insulation (4) between the inner conductor and the cable screen, wherein the cable screen is removed on both sides of a measurem... | 05/22/2001 |
| 6232785 | Portable microphone/speaker for audio signal line testing The device includes a housing containing a dc battery, a microphone, an audio tone signal source, and a speaker and headphone jack which can receive audio signals from either the microphone or the tone signal source, and two multi-pin XLR receptacles or j... | 05/15/2001 |
