Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 8179122 | Current/voltage detection printed board and current/voltage detector A printed board, includes: a first shield portion, configured to reduce an influence of an electric field in combination with a casing accommodating the printed board, at least a part of the first shield portion being formed with a plurality of through holes; and a ... | 05/15/2012 |
| 8159211 | Clamp jaw assembly A clamp jaw assembly for a clamp meter is provided. The clamp jaw assembly comprises a housing containing a clamp jaw core disposed within a shield. The housing, shield, and core of the clamp jaw assembly are configured to provide an extended creepage and clearance ... | 04/17/2012 |
| 8115475 | Manipulation assembly for online electrical system test probe installation An apparatus for online partial discharge testing includes a split-core radio-frequency current transformer sensor, an actuation subassembly, and a biasing member. The current transformer sensor has a first portion, a second portion, and a sensor hinge operably enga... | 02/14/2012 |
| 8089266 | Measuring induced currents on a CAN bus A device for measuring currents induced in a CAN bus harness. In some embodiments, the device includes a first termination node, a second termination node, a current separator, a detection circuit, and a power source circuit. The current separator circuit has an RF ... | 01/03/2012 |
| 7990133 | Non-intrusive electric alternating current sensor A method and a current sensor for measuring current in a conductor are provided. The current sensor has a flexible coil having a first end and a second end and a mounting ring. The flexible coil is wrapped within the mounting ring to form a closed loop. The mounting... | 08/02/2011 |
| 7969140 | Magnetic field sensor and electrical current sensor therewith A magnetic field sensor comprises a magnetic field sensing cell and a magnetic shield comprising at least two parts separated by an air-gap and surrounding the magnetic field sensing cell positioned in a cavity of the magnetic shield. ... | 06/28/2011 |
| 7902813 | Protective digital relay device Relay devices, systems and methods for obtaining an accurate representation of a current monitored with a Rogowski coil, without integration of the Rogowski coil output voltage signal in the time domain. ... | 03/08/2011 |
| 7884598 | Clamp jaw assembly A method of manufacturing a clamp jaw assembly for a clamp meter is provided. The method includes providing a clamp jaw core and a shield having a channel. The method further includes positioning the clamp jaw core within the channel of the shield such that the shie... | 02/08/2011 |
| 7876086 | Current measuring device for measuring the electrical current flowing in an electrical conductor electrically isolated from the current measuring device A current measurement device is configured to measure electrical current in a primary conductor that is electrically insulated from the current measuring device. The current measuring device includes a transformer with a saturable magnetic core formed with a central... | 01/25/2011 |
| 7834614 | Method and apparatus for evaluating rapid changes in current In order to detect and evaluate changes in current as a result of electric arcs, a sensor signal, differentiated on the basis of time, is produced with a sensor-dependent frequency bandwidth whose upper cutoff frequency is 40 MHz and whose lower cutoff frequency is ... | 11/16/2010 |
| 7834613 | Isolated current to voltage, voltage to voltage converter A current sensor is provided that employs a primary winding that carries the current to be measured, and a secondary winding that controls the flux inside the magnetic core, provides a sample of the primary current, and also helps to control the flux at small primar... | 11/16/2010 |
| 7772828 | Automatic test equipment capable of high speed test Automatic test equipment is capable of performing a high-speed test of semiconductor devices, with a low cost and high efficiency. The automatic test equipment (ATE) comprises: an ATE body configured to electrically test semiconductor devices; a field programmable g... | 08/10/2010 |
| 7746059 | Current measurement apparatus The current measurement apparatus comprises a Rogowski coil 20 comprising a wire or conductor which forms a coil 22 and returns through the coil 22 as a central conductor. The coil 22 and the central conductor are formed from a single con... | 06/29/2010 |
| 7710104 | Out-of-line measurement of a current flowing through a load A load measuring circuit including a cable including first and second conductors and a shielding. The conductors are connected by a first end thereof to a load, the shielding is not connected to a ground at the end, and the conductors are connected to a generator by... | 05/04/2010 |
| 7696743 | Zero-phase current detecting apparatus In a zero-phase current detecting apparatus, a feedback loop is made up of a pulse generating unit, a current detecting unit, a peak detecting unit, an adding unit, and a current regulating unit. The adding unit outputs a difference between a target value and a peak... | 04/13/2010 |
| 7671580 | Integrated current sensing transformer and current sensing circuit using such transformer An integrated current sensing transformer includes a bobbin, a magnetic core assembly, a first primary winding element, a second primary winding element, a secondary winding element. The bobbin has a receptacle therein. The magnetic core assembly is partially embedd... | 03/02/2010 |
| 7659710 | Electrical measuring instrument having a current clamp measures the current while detached from and attached to the housing A current clamp meter having a current meter body and a detachable current clamp. The current meter body and the current clamp are configured so that the current clamp is detachable from the current meter body and the meter is operable with the current clamp either ... | 02/09/2010 |
| 7656149 | Current transformer and electric energy meter A current transformer detects a sine-wave alternating current having a maximum effective current value Imax(Arms) and a frequency f(Hz) and a half-sine-wave rectified current having a maximum peak value Ipeak(Aop) and a fr... | 02/02/2010 |
| 7638999 | Protective relay device, system and methods for Rogowski coil sensors Relay devices, systems and methods for obtaining an accurate representation of a current monitored with a Rogowski coil, without integration of the Rogowski coil output voltage signal in the time domain. ... | 12/29/2009 |
| 7633287 | Current sensor A core is divided by alternately arranging plural magnetic material portions and plural non-magnetic material portions in a circumferential direction of the core through which a primary conductor penetrates. A conductor is wound around the core under conditions in w... | 12/15/2009 |
| 7622910 | Method and apparatus for AC integrated current sensor Integrated current sensors are used in AC electric power systems. An integrated current sensor according to one embodiment comprises: an inductor (101), wherein an AC current passes through the inductor (101); an integrator circuit (103), the in... | 11/24/2009 |
| 7615989 | Method and apparatus for DC integrated current sensor Integrated current sensors are used in DC electric power systems. An integrated current sensor (200B) according to one embodiment comprises: a DC inductor (111B) including a resistive component and an inductive component, wherein a DC current passes th... | 11/10/2009 |
| 7615988 | Wide range current sensing method and system A current measurement technique is disclosed in which a family of transformer coils having the same number of turns and the same winding resistance may be associated an active circuit for presenting a burden resistance of substantially zero value. The impedance of t... | 11/10/2009 |
| 7598724 | Flexible current transformer assembly A current transformer assembly includes at least one Rogowski coil having a first closeable loop with an electrically conductive coil member and a first pair of terminals. An integrator unit has respectively a cable connected across the first pair of terminals of a ... | 10/06/2009 |
| 7583075 | Subtractive current measuring method The present invention is a subtractive current measuring system for a power receptacle. The system may comprise one or more of the following features: (a) a power receptacle; (b) a current carrying input wire; (c) a current carrying output wire; (d) a current transf... | 09/01/2009 |
| 7570045 | Attachment device and method for fastening electrical cable monitoring instruments to electrical cables The present invention is an attachment device and a method for fastening and removing an electrical cable monitoring instrument to an electrical cable. The attachment device comprises monitoring instrument sensor with opening for positioning electrical cable such th... | 08/04/2009 |
| 7557563 | Current sensor assembly A sensor apparatus for measuring power parameters on a power conductor, such as a high voltage transmission line may include a corona structure, an electronics assembly and a conductor mountable device. The corona structure may define an outer boundary surrounding t... | 07/07/2009 |
| 7545138 | Precision, temperature-compensated, shielded current measurement device A current measurement device using a Rogowski coil having a generally toroidally shaped core with flattened faces, a first winding in one direction, a second winding forming a return loop, and a temperature compensation and scaling network coupled to the coil. The c... | 06/09/2009 |
| 7541800 | Methods and systems for detecting DC influence in a current sensor Methods and systems for an electrical meter are provided. The meter includes a current sensor configured to be communicatively coupled to a conductor, and a processor communicatively coupled to the current sensor wherein the processor is configured to receive signal... | 06/02/2009 |
| 7538541 | Split Rogowski coil current measuring device and methods A split Rogowski coil assembly having distinct coil loops formed on printed circuit boards that are not joined to one another. ... | 05/26/2009 |
| 7532001 | Q-boosting circuit Provided is a Q-boosting circuit for improving a Q factor in a radio frequency (RF) integrated circuit of a semiconductor device using a transformer instead of an inductor. The Q-boosting circuit couples a negative resistance circuit to a pair of terminals of a tran... | 05/12/2009 |
| 7528594 | Device for the reading of direct and/or alternating currents The present invention is related to a device (1) for the detection of direct and/or alternating current to be used in the realization of highly sensitive amperometric measuring instruments or for the detection of differential faults along with automatic switc... | 05/05/2009 |
| 7439726 | Electrical measuring instrument having detachable current clamp probe A current clamp meter having a current meter body and a detachable current clamp. The current meter body and the current clamp are configured so that the current clamp is detachable from the current meter body and the meter is operable with the current clamp either ... | 10/21/2008 |
| 7417419 | Method and arrangement for connecting electrical components in an electricity meter A current coil arrangement in an electricity meter includes first and second current coils. The first current coil has two current blades and a middle portion extending therebetween. The two current blades are configured to be received by a utility meter socket devi... | 08/26/2008 |
| 7397234 | Current sensor with reset circuit A current sensor includes an integrator for providing an output signal, responsive to a detected current, and a reset circuit. The reset circuit, responsive to a control signal, resets the integrator for a time period shorter than an assertion time of the supplied c... | 07/08/2008 |
| 7365535 | Closed-loop magnetic sensor system A closed loop magnetic sensor system for measuring an input magnetic field from a magnetic field source has a compensation circuit, which can be for example a printed wire board, and a magnetic sensor, such as a Magnetoresistive (MR) sensor, for measuring an input m... | 04/29/2008 |
| 7363175 | Query based electronic battery tester An electronic battery tester for testing a storage battery provides a test output indicative of a condition of the battery. Electronic measurement circuitry provides a measurement output related to a condition of the battery. The battery condition is determined base... | 04/22/2008 |
| 7362086 | Integrated current sensor A current sensor includes coupled inductors that generate an output current responsive to a detected current. The coupled inductor is implemented in an integrated circuit. An integrator circuit generates a sensed voltage responsive to the output current. ... | 04/22/2008 |
| 7358716 | Measuring method and measuring arrangement for measuring currents with a large dynamic range A measuring method for measuring currents with a large dynamic range by means of a magnetic measuring module has the steps of switching into a high-current mode when a current threshold value is exceeded, and switching into a low-current mode otherwise, wherein the ... | 04/15/2008 |
| 7342393 | Multimeter with filtered measurement mode A multimeter with a filtered measurement mode. By pressing a single button or key, a low-pass filter is switched into the signal path to filter voltage spikes, noise, and switching transients from pulse-width modulated pulses, or lower frequency sinusoidal signals w... | 03/11/2008 |
