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| Number | Title | Issue Date |
| 7323877 | Apparatus and methods for making spectroscopic measurements of cathode fall in fluorescent lamps Apparatus and methods are disclosed for measuring cathode fall within a fluorescent lamp that contains an electrode and a gas. A level of cathode fall associated with the electrode may be identified based on an intensity and wavelength of radiation emitted by the ga... | 01/29/2008 |
| 7312602 | Electrical meter with retractable leads An electrical meter 10 comprises a housing 12 with a spool 14 rotatably mounted therein. A first lead cable 16 and a second lead cable 18 are wound upon the spool 14. A wound spring 90 is connected to the spool and bi... | 12/25/2007 |
| 7234980 | Loadbreaking electrical connector probe with enhanced threading and related methods A loadbreak electrical connector may include a housing having first and second intersecting passageways therein, and a conductive member to be received in the first passageway. The conductive member may have a first end to receive a cable end, and have a transverse ... | 06/26/2007 |
| 7212130 | Sound intensity display system for use by performers A sound intensity display system for use by performers. The invention is a system which displays indications of sound intensity on a display large enough to be viewed by performers distant from the display. This invention allows indication of a sufficient number of ... | 05/01/2007 |
| 7108568 | Loadbreak electrical connector probe with enhanced threading and related methods A loadbreak electrical connector may include a housing having first and second intersecting passageways therein, and a conductive member to be received in the first passageway. The conductive member may have a first end to receive a cable end, and have a transverse ... | 09/19/2006 |
| 7098799 | Unit for sensing physical quantity A sensor unit sensing a physical quantity comprises a first voltage evaluation circuit, a second voltage evaluation circuit, an alarm signal output circuit, and a sensor output circuit. The first voltage evaluation circuit evaluates a power voltage by comparing it w... | 08/29/2006 |
| 6856924 | Mixer-based timebase for sampling multiple input signal references asynchronous to each other Sampling is performed. A strobe signal is generated from a first signal. Multiple sampled signals are sampled using the strobe signal. Each of the multiple sampled signals is synchronous with its own clock reference and each of clock references are asynchronous with... | 02/15/2005 |
| 6828814 | Circuit configuration and display element A circuit configuration has an integrated semiconductor element, preferably, an intelligent power semiconductor, and a display element. A display element diagnoses and displays disturbances in the integrated semiconductor element. The display element connects electr... | 12/07/2004 |
| 6788043 | Lightning detection and data acquisition system A lightning detection and data acquisition system. A plurality of remote programmable sensor is utilized to detect cloud to ground and IC lightning strikes. Analog representations of the lightning strikes are converted to digital signals. The digital signals are cla... | 09/07/2004 |
| 6483316 | Method of diagnosing partial discharge in gas-insulated apparatus and partial discharge diagnosing system for carrying out the same The present invention provides a method of diagnosing a partial discharge in a gas-insulated apparatus and a partial discharge diagnosing system for carrying out the same to achieve highly accurate diagnosis through the detection of a partial discharge si... | 11/19/2002 |
| 6313635 | High voltage sensor assembly A high voltage sensor that is adapted to be connected to a terminal. The terminal is disposed in a housing having an outer surface and having a chute extending inwardly from the outer surface to a distal position inside of the housing. The high voltage se... | 11/06/2001 |
| 6300768 | Method of diagnosing partial discharge in gas-insulated apparatus and partial discharge diagnosing system for carrying out the same The present invention provides a method of diagnosing a partial discharge in a gas-insulated apparatus and a partial discharge diagnosing system for carrying out the same to achieve highly accurate diagnosis through the detection of a partial discharge si... | 10/09/2001 |
| 6255808 | Device for measuring partial discharge in gas-insulated high voltage facilities, the device having a HF sensor and UHF sensor To perform a reliable and calibrated measurement of partial discharges, a first calibratable sensor and a second sensor are arranged in a metal enclosure. The first calibrated sensor picks up signal components in the HF (High Frequency) range, and the sec... | 07/03/2001 |
| 5675246 | Current flow indicator An apparatus connectable between a current source and an electrical load for indicating current flow through the load above a threshold level. The indicator includes two negative temperature coefficient (NTC) thermistors, and a neon indicator lamp. The fi... | 10/07/1997 |
| 5572116 | Surge counter A surge detecting element which is connected to surge invading lines and is composed of a gap type discharge tube and a nonlinear resistor both connected in series with each other and one or more of surge absorbing elements each having an impulse discharg... | 11/05/1996 |
| 5430604 | Hand-held electrostatic discharge generator An electrostatic discharge generator device for generating/simulating controlled electrostatic discharges, in both positive and negative polarities is disclosed for testing electronic equipment. The device includes an electrically conductive body with an ... | 07/04/1995 |
| 5412312 | Frequency and instantaneous voltage level meter A volt/frequency meter includes LED arrays which provide bar-graph style meter displays of the instantaneous voltage and the frequency of a variable electric analog signal. Each LED in the voltage array corresponds to a predetermined voltage range and eac... | 05/02/1995 |
| 5166610 | Dual range speed indicator with acceleration display A solid state speed indicator for railroad locomotives is provided with a plurality of indications in addition to speed. These include an acceleration indicator and an overspeed indicator. In addition, the speed indicator is provided with a dual range spe... | 11/24/1992 |
| 5150051 | Home gaussmeter with filter-integrator circuit for measuring elf radiation A meter (10) for measuring extremely-low-frequency radiation includes a coil circuit (22) whose output is filtered by a sharp-cut-off high-pass filter (24) to pass standard house-current frequencies but suppress the frequency components that would predomi... | 09/22/1992 |
| 5119426 | Linear array level meter displaying multiple audio characteristics A linear display device provides a floating bar type of display for instantaneous peak values and instantaneous average values of an audio signal. Pairs of respective peak and average comparators are coupled to a source of fixed value bias voltages. The c... | 06/02/1992 |
| 5075620 | Hot line indicator A voltage detector/indicator unit includes a plurality of lights for indicating a voltage within one of a plurality of different voltage ranges by lighting the lights in a selected pattern.... | 12/24/1991 |
| 5065104 | Fault sensing with an artificial reference potential provided by an isolated capacitance effect A ground fault detector has a neon bulb connected between a rectangular copper plate connected to an antenna wire and a resistor connected to one arm of a double-pole double-throw relay with the stationary contacts cross coupled to hot and neutral wires o... | 11/12/1991 |
| 5055772 | High voltage ignition system monitor for spark initiated internal combustion engines A method and device for continuously monitoring the distributed high voltage pulses from an ignition coil of an electrical system of an internal combustion engine is disclosed. The device is a transparent enclosure filled with a noble gas at low pressure.... | 10/08/1991 |
| 5008613 | Voltage tester for graduated optical display of a voltage and method for its manufacture A voltage tester for the graduated display of a voltage applied to two test tips includes a circuit arrangement composed of a parallel connection of three series circuits whereby a PTC-resistor, an antiparallel connection of two light-emitting diodes, and... | 04/16/1991 |
| 5003249 | Electrical power detection and indication device An electrical power detection and indication device for quick and simple external attachment onto an insulated electric power cord, is linked to the conductors of the power cord by sharp probes which penetrate the insulation on the power cord conductors. ... | 03/26/1991 |
| 4946393 | Separable connector access port and fittings The invention is the provision of an access to the interior of a high voltage separable connector component by providing a projection of insulating elastomeric material integral with the insulating material of the body of the component and in engagement w... | 08/07/1990 |
| 4870343 | High voltage detector A high voltage detecting device has an input terminal for receiving electrical energy and includes a first circuit having a gas filled tube receiving electrical energy from the terminal. The gas filled tube provides a visual indication of the presence of ... | 09/26/1989 |
| 4827213 | Apparatus for the contactless determination of variable intervals of distance by pulsatory spark discharges An apparatus including at least two electrodes determining two intervals of distance of a body relative to movable objects and activated by a respective high voltage pulse generator, wherein the spark discharges occur either along measurement spark paths ... | 05/02/1989 |
| 4806854 | Current draw and power consumption display circuit A circuit layout for continuous display of power consumption of an electric device includes a light emitting diode actuated by voltage pulses, the frequency whereof corresponds to the current draw of the electric device. It is possible to determine direct... | 02/21/1989 |
| 4804909 | Atto-amperemeter An atto amperemeter includes a shop tip (1) correctable to a voltage source (18) providing a known potential (U') via a sample conductor measured, the tip (1) faces a particle detector such as an electron multiplier (4). The count of the free electrons be... | 02/14/1989 |
| 4594546 | Voltmeter for remotely sensing high voltages A passive voltmeter that measures pulses of high voltage by periodically charging a condensor through a spark gap. The frequency at which the spark gap breaks down is a function of the voltage being measured and is detected and displayed in volts. Radioa... | 06/10/1986 |
| 4559496 | LCD Hook-on digital ammeter A low cost hook-on ammeter for consumer use includes a split core to be clipped around a conductor. Secondary turns on the core actuate a liquid crystal digital display to indicate alternating current amplitude in the conductor. The liquid crystal display... | 12/17/1985 |
| 4532472 | LED level meter A stereo sound level display device includes a single array of light emitting diodes aligned in a line. The left channel sound signal level is detected to display the left channel sound signal level from the left end of the light emitting diode array. At ... | 07/30/1985 |
| 4528501 | Dual loudness meter and method A dual loudness meter and method for simultaneously indicating the apparent loudness of composite audio program material representing peak material or of persistent material employing a first detector means responsive to peak signals for instantaneously i... | 07/09/1985 |
| 4471300 | LDC Hook-on digital ammeter A low cost hook-on ammeter for consumer use includes a split core to be clipped around a conductor. Secondary turns on the core actuate a liquid crystal digital display to indicate alternating current amplitude in the conductor. The liquid crystal display... | 09/11/1984 |
| 4470007 | Apparatus for testing the electrical breakdown resistance potential of insulating media and/or cooling media The invention relates to an apparatus for testing the electrical breakdown resistance potential of insulating media and/or cooling media, especially of synthetic insulating oils for transformers, transducers, switches or the like, having a container and, ... | 09/04/1984 |
| 4438396 | Low cost volt/ampere meter with liquid crystal display A low cost volt/ampere meter for consumer use employs a single liquid crystal bargraph display and a simple voltage divider network to display both line voltages and appliance currents encountered in a residential environment. The instrument employs stand... | 03/20/1984 |
| 4434402 | Electrical equipment An igniter test unit produces a square wave voltage that is applied across a parallel circuit comprising a first capacitor and a series arrangement of a second capacitor and diodes. An inductance and a thyristor are connected across the first capacitor, i... | 02/28/1984 |
| 4388589 | Color-emitting DC level indicator A DC level indicator represents a sensed DC level by a color of emitted light. The indicator includes a plurality of lamps or LED's, each emitting a respective primary color, and a current-feeding circuit supplying current to each of the lamps or LED's wh... | 06/14/1983 |
| 4386315 | Electric field detector Apparatus for detecting electric fields and providing an indication of their magnitude includes a glass bulb containing a gas such as neon. When the bulb is placed in a time varying electric field, pulses of electromagnetic radiation are generated within ... | 05/31/1983 |
