| Patents for G01R 25 - Arrangements for measuring phase angle between a voltage and a current or between voltages or currents (2,594) |
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| 10/05/2011 | CN101672877B Amplitude-modulated signal accompanying phase modulation measurement method based on vector analysis |
| 09/29/2011 | WO2011116822A1 A phase detector |
| 09/29/2011 | WO2011071760A3 Method and apparatus for measuring the phase change of a sound wave propagating through a conduit |
| 09/28/2011 | CN1815892B Circuit for detecting phase-error and generating control signal |
| 09/28/2011 | CN102200550A Delay orthogonal digital intermediate-frequency phase discrimination method for detecting phase difference accurately |
| 09/28/2011 | CN102200549A Phase detection device and method |
| 09/27/2011 | US8027797 Methods and apparatus for determining a switching history time constant in an integrated circuit device |
| 09/27/2011 | US8026725 Optical fiber coupled antenna current monitor |
| 09/21/2011 | EP2367263A2 Wireless power feeder, wireless power receiver, and wireless power transmission system |
| 09/21/2011 | CN201984119U 一种安规测试系统 One kind of safety test system |
| 09/21/2011 | CN201984103U 避雷器泄漏电流在线检测装置 Online arrester leakage current detection device |
| 09/21/2011 | CN102197598A System and method for precision phase shift measurement |
| 09/21/2011 | CN102195496A Phase angle measurement of a dimming circuit for a switching power supply |
| 09/21/2011 | CN102193023A Synchronization detecting circuit and automatic synchronous parallelization apparatus |
| 09/21/2011 | CN102193016A Detecting method of self-adaptive frequency tracking current |
| 09/14/2011 | CN102185607A Phase difference detection method, device and circuit in phase-locked loop circuit |
| 09/14/2011 | CN102183692A Phase frequency characteristic measurement method for tunable fiber Fabry-Perot (FFP) filter and application |
| 09/14/2011 | CN101655517B Voltage test circuit and voltage test method |
| 09/14/2011 | CN101587147B Method for executing phasor correcting for synchronous phasor measuring apparatus |
| 09/06/2011 | US8013636 Synchronous phase detection circuit |
| 09/06/2011 | US8013593 Voltage measuring apparatus for semiconductor integrated circuit and voltage measuring system having the same |
| 09/06/2011 | US8013592 Method and apparatus for detecting the phase wiring of an arbitrary unknown phase voltage relative to a reference phase voltage |
| 08/31/2011 | CN201955396U 接地测显仪 Ground measurement display instrument |
| 08/31/2011 | CN102169138A Method for processing correction of phase difference of power grid test or counting device |
| 08/31/2011 | CN101487861B Detection method for electric voltage phase angle jump at network voltage dip |
| 08/30/2011 | US8008947 Balanced phase detector |
| 08/30/2011 | US8008946 Semiconductor integrated circuit |
| 08/24/2011 | CN201945634U 一种具有信号输出功能的相序贴 A phase sequence with a signal output posted |
| 08/24/2011 | CN201945629U 光伏逆变器交流电压采样电路 PV inverter AC voltage sampling circuit |
| 08/23/2011 | US8004269 Wide bandwidth measurement of RF power into an arbitrary impedance load |
| 08/23/2011 | US8004268 Signal measuring device |
| 08/18/2011 | WO2011038166A3 Measuring phase noise in radio frequency, microwave or millimeter signals based on photonic delay |
| 08/18/2011 | US20110199072 Power control system and method |
| 08/17/2011 | CN102158997A Heating device capable of detecting position of material container |
| 08/17/2011 | CN102157914A Novel half-wave rapid detection method for relay protection device |
| 08/17/2011 | CN102156261A Device and method for predicating angle on basis of high-order state information of generator |
| 08/17/2011 | CN101496724B Method and system for distortion compensation |
| 08/16/2011 | US7999577 Apparatus and method for detecting a changing point of measured signal |
| 08/11/2011 | DE10039666B4 Verfahren und Vorrichtung zur Abschätzung der Frequenz und/oder der Phase eines digitalen Signals Method and apparatus for estimating the frequency and / or the phase of a digital signal |
| 08/10/2011 | CN102147440A Method for diagnosing partial discharge defect severity of paper oil insulating edge surface of transformer |
| 08/08/2011 | CA2727593A1 Electric power metering device and method |
| 08/03/2011 | CN201917612U 一种相位差测量装置 A retardation measuring device |
| 08/03/2011 | CN102141586A Power equipment online monitor method and device |
| 07/28/2011 | WO2011089421A1 Apparatus and method for measuring a phasor of an electrical power system signal |
| 07/28/2011 | US20110181892 Automatic calibration technique for time of flight (tof) transceivers |
| 07/28/2011 | US20110181269 Apparatus and method for identifying the phase and terminal for power system devices |
| 07/28/2011 | CA2786147A1 An apparatus and method for identifying the phase and terminal for power system devices |
| 07/27/2011 | CN201909812U Novel phase difference detection circuit |
| 07/27/2011 | CN201909809U Measuring instrument for 25-Hz phase-sensitive track circuit |
| 07/27/2011 | CN102135570A Synchronous phasor measuring method and device for intelligent transformer substation |
| 07/27/2011 | CN102135568A Period detection method and phase difference detection method for alternating current signal |
| 07/27/2011 | CN101685113B Method and device for measuring phase shift |
| 07/27/2011 | CN101515006B Method for measuring nonlinear susceptibility of materials |
| 07/26/2011 | US7987061 Non-linear frequency and phase measurement scheme |
| 07/26/2011 | US7987058 Self-learning reverse power flow detection |
| 07/20/2011 | EP2345154A2 Phase frequency to digital converter |
| 07/20/2011 | CN102128983A Method for measuring phase of power transmission and distribution line |
| 07/20/2011 | CN102128975A Voltage stabilization online monitoring phasor data measurement device and phasor measurement method |
| 07/20/2011 | CN101661069B Dynamic process real-time estimation method of weak observable non-PMU measuring point independent of state matrix |
| 07/20/2011 | CN101252348B Voltage controlled oscillator |
| 07/20/2011 | CN101183144B Single-phase power-supply wiring judgement method and single-phase power supply phase testing circuit |
| 07/14/2011 | WO2011029018A3 Voltage conversion and/or electrical measurements from 400 volts upwards |
| 07/13/2011 | CN201897617U Intelligent nuclear phase pen |
| 07/13/2011 | CN101458286B Phasor measuring set based on in situ spectroscopic analysis and applied wide domain measuring system |
| 07/06/2011 | CN201892733U Power angle measuring device for power generator |
| 07/06/2011 | CN201892705U High-voltage phase online monitoring device |
| 07/06/2011 | CN201892700U Secondary side electricity-testing and nuclear-phase handcart of central switch cabinet |
| 07/06/2011 | CN102116815A Safety test system |
| 06/30/2011 | US20110158031 Signal calibration methods and apparatuses |
| 06/29/2011 | CN102109562A Double-bus single-segment wiring bus differential protection automatic analyzer |
| 06/28/2011 | US7969202 Fractional-N frequency synthesizer |
| 06/28/2011 | US7969155 Directional fault current indicator |
| 06/22/2011 | CN201876512U Circuit leakage current detecting circuit |
| 06/22/2011 | CN201876504U Nuclear phase handcart |
| 06/22/2011 | CN201876496U Phase detection circuit |
| 06/22/2011 | CN102103158A Method for judging adaptive statically stable current based on power angle |
| 06/22/2011 | CN101178418B Volt-ampere phase meter with no influence from harmonic |
| 06/16/2011 | WO2011071760A2 Method and apparatus for measuring the phase change of a sound wave propagating through a conduit |
| 06/15/2011 | CN102095948A Method for obtaining measuring value and auto-transformer parameter |
| 06/15/2011 | CN102095937A Method for quickly measuring instantaneous phase of alternating current electrical signal |
| 06/15/2011 | CN102095936A Method for measuring phase difference of alternating-current electric signals quickly |
| 06/15/2011 | CN102095935A Method for measuring instantaneous phase of alternating current electrical signal |
| 06/15/2011 | CN102095934A Measuring method for phase difference of alternating current signals |
| 06/15/2011 | CN102095933A Phase test device and control method thereof |
| 06/15/2011 | CN102095932A Detection method of voltage phase at access point of photovoltaic inverter |
| 06/15/2011 | CN102095931A High-voltage phase wireless verifying instrument |
| 06/15/2011 | CN102095926A System for automatically detecting power system configuration |
| 06/15/2011 | CN101509943B Phase detecting method and apparatus |
| 06/15/2011 | CN101009430B Apparatus, method and computer program product for tracking information in an electric grid |
| 06/08/2011 | EP2329599A1 System and method for precision phase shift measurement |
| 06/07/2011 | CA2496214C Testing of current transformers |
| 06/01/2011 | CN102082423A Relay protection method for phase to phase fault of circuit |
| 06/01/2011 | CN102081123A Automatic capacitance and inductance testing device |
| 06/01/2011 | CN102081121A Wireless high voltage phase checking device |
| 05/31/2011 | US7952841 Device for detecting malfunctions by manipulation of an internal voltage supply |
| 05/26/2011 | US20110121907 Driver device, physical quantity measuring device, and electronic instrument |
| 05/26/2011 | US20110121815 Measuring apparatus, parallel measuring apparatus, testing apparatus and electronic device |
| 05/25/2011 | CN201845054U Multifunctional digital phase detection measuring instrument |
| 05/25/2011 | CN102072988A Access point voltage phase detection method of photovoltaic inverter by applying multiple zero-crossing points |
| 05/25/2011 | CN102072987A Phase estimation method for short-interval sinusoidal signal and experimental device thereof |