| 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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| 07/09/2009 | US20090174436 Input signal level detection apparatus and method |
| 07/08/2009 | CN100510758C Microelectron mechanical microwave signal phase detector and method for preparing the same |
| 07/02/2009 | WO2009082395A1 Method and system for low-power three-phase detection |
| 07/01/2009 | CN101470144A Digitized measuring method for controlled silicon conduction angle |
| 07/01/2009 | CN101470143A Apparatus and method for on-line resistance measurement |
| 06/30/2009 | US7555394 Measuring circuit and a method for determining a characteristic of the impedance of a complex impedance element for facilitating characterization of the impedance thereof |
| 06/24/2009 | CN100504403C Phase tester with improved timing boundary |
| 06/18/2009 | US20090153133 Methods and apparatus for collecting characteristics of a power line a bpl system |
| 06/16/2009 | US7548074 Micromechanical microwave power meter |
| 06/11/2009 | US20090146640 Phase difference measuring device and phase comparison circuit adjusting method |
| 05/28/2009 | WO2009065294A1 Auto-metering unit for power distribution transformer |
| 05/28/2009 | US20090134884 Method for determining the layer thickness of a tbc coating of at least one blade of a non-positive-displacement machine, a corresponding tbc layer thickness measuring device for carrying out the method and use of the method and the tbc layer thickness measuring device |
| 05/27/2009 | CN201247298Y Automatic recognizing instrument for relay protection differential vector |
| 05/26/2009 | US7538563 Determination of equivalent series resistance |
| 05/20/2009 | CN201242567Y Apparatus for measuring AC voltage parameter using generator residual pressure |
| 05/20/2009 | CN100489545C Cable identifying method and cable identifying instrument |
| 05/19/2009 | US7535372 Method for measuring the operating state of a synchronous motor using composite power angle meter |
| 05/12/2009 | US7532038 Phase detecting circuit having adjustable gain curve and method thereof |
| 04/29/2009 | EP2052452A1 Producing a phasor representation of an electrical entity in a multiphase ac electric power system |
| 04/23/2009 | US20090105979 Fixed reference frame phase-locked loop (FRF-PLL) for unbalanced line voltage conditions |
| 04/22/2009 | CN100481711C High performance signal generation |
| 04/22/2009 | CN100480706C Method and circuit for measuring same-frequency signal phase difference using fixed phase shift |
| 04/15/2009 | CN201222083Y Practical impedance detector |
| 04/15/2009 | CN101408568A Method and device for measuring electrical signal phase of alternating current |
| 04/14/2009 | US7518353 Vector network analysis system and method using offset stimulus signals |
| 04/08/2009 | CN201219197Y AC phase sequence affirmation and phase loss protector |
| 04/07/2009 | US7516032 Resolution in measuring the pulse width of digital signals |
| 03/31/2009 | US7511469 Phase measurement device using inphase and quadrature components for phase estimation |
| 03/25/2009 | EP2039008A2 Device and method for high resolution time measurements |
| 03/25/2009 | CN100472217C Performance test method of synchronous phasor measuring device and test system |
| 03/18/2009 | CN101387671A System parameter of linearity multi-port, detection method and device for vector network analyzer |
| 03/17/2009 | US7505857 Water quality monitoring device and method |
| 03/10/2009 | US7501861 Phase-difference detecting apparatus and method |
| 02/24/2009 | US7495451 Terminal leakage monitoring for field devices |
| 02/18/2009 | EP1450170B1 Phase detector capable of detecting an accumulated value of phase displacement at a high speed and frequency stability measurement apparatus for arbitrary nominal frequency using the same |
| 02/18/2009 | CN201196664Y Test device for electric power line voltage phase angle |
| 02/18/2009 | CN100462726C Phase detector and related phase detecting method thereof |
| 02/18/2009 | CN100462725C Electric power meter |
| 02/11/2009 | CN201194022Y Intelligent railway circuit parameter test disc |
| 02/05/2009 | DE102007022432B4 Vorrichtung zum Erfassen einer Zeitlage einer Flanke An apparatus for detecting a timing of an edge |
| 01/27/2009 | US7482842 Radiation hardened phase frequency detector for implementing enhanced radiation immunity performance |
| 01/20/2009 | US7479777 Circuitry and method to measure a duty cycle of a clock signal |
| 01/15/2009 | US20090018786 Interferometric iterative technique with bandwidth and numerical-aperture dependency |
| 01/14/2009 | EP2015419A2 Method for assigning a residual current to one of the three phase currents of a three-phase system and residual current protection switch |
| 01/13/2009 | US7477078 Variable phase bit sampling with minimized synchronization loss |
| 01/07/2009 | EP2012133A1 Directional fault current indicator |
| 01/07/2009 | CN201177641Y Secondary circuit wiring checking system |
| 01/07/2009 | CN101339212A Non-contact type high voltage phasing tester |
| 01/06/2009 | CA2510738C Pll circuit and phase control method of pll circuit |
| 12/31/2008 | CN201173951Y Two path bar signal phase difference detector for fluid speed measurement |
| 12/30/2008 | US7472028 Sensor or capacitance measuring with a microprocessor |
| 12/25/2008 | US20080319693 Method, Device And Computer Program For Evaluating A Signal Transmission |
| 12/25/2008 | US20080319690 Forward Voltage Short-Pulse Technique for Measuring High Power Laser Diode Array Junction Temperature |
| 12/23/2008 | US7468601 Direct phase and frequency demodulation |
| 12/16/2008 | US7466141 Phase measurement device, method, program, and recording medium |
| 12/11/2008 | WO2008149990A1 Phase measuring device, skew measuring device, phase measuring method, and skew measuring method |
| 12/11/2008 | US20080303509 Phase measurement apparatus, skew measurement apparatus, phase measurement method, and skew measurement method |
| 12/10/2008 | CN101320060A Fast phase meter |
| 12/04/2008 | US20080297200 Methods for eliminating phase distortion in signals |
| 12/03/2008 | CN101315397A Amplitude phase measuring method |
| 11/27/2008 | WO2008143520A1 Method and apparatus for monitoring generation and transmission of electrical power |
| 11/27/2008 | US20080290903 Method and radiation hardened phase frequency detector for implementing enhanced radiation immunity performance |
| 11/18/2008 | US7454300 Extracting high frequency impedance in a circuit design using broadband representations |
| 11/18/2008 | US7453969 PLL circuit and phase control method of PLL circuit |
| 11/18/2008 | US7453268 Input power protected ratiometric output sensor circuit |
| 11/13/2008 | DE102007022432A1 Device for detecting timing of edge of signal has adjustable delay element that delays signal by adjustable delay value as phase shift value for shifting phase of signal, based on which timing of predefined edge of signal is detected |
| 11/05/2008 | CN201145708Y High precision conductive angle digital display device |
| 11/05/2008 | CN201145707Y Volt-ampere phase meter without influence of harmonic |
| 11/05/2008 | CN100430739C Apparatus for measuring entrance phase position of Tokamak low-noise-wave antenna array and phase-appraising method |
| 10/30/2008 | US20080265869 Switching power supply performance testing |
| 10/29/2008 | CN201141889Y Display equipment for high voltage live display device |
| 10/29/2008 | CN101294996A Measuring circuit |
| 10/28/2008 | US7443206 High-frequency linear phase-frequency detector with wide-pulse outputs |
| 10/23/2008 | WO2008126240A1 Synchronous phasor measuring device and inter-bus phase angle difference measuring device employing it |
| 10/23/2008 | CA2675010A1 Synchrophasor measuring device and inter-bus-line phase angle difference measurement unit using the same |
| 10/22/2008 | CN101291059A Electricity quality analyzer oriented to digitalized electrical system and electricity quality analysis method |
| 10/09/2008 | WO2008120282A1 Ac electric quantity measuring device |
| 10/08/2008 | CN201130207Y Multifunctional electrical parameter measurer |
| 10/07/2008 | US7432751 High performance signal generation |
| 09/24/2008 | CN101271134A Test method of electric power line voltage phase angle |
| 09/18/2008 | US20080224689 Phase measurement device using inphase and quadrature components for phase estimation |
| 09/17/2008 | CN101266265A Method for detecting high voltage frequency converter electric network voltage phase |
| 09/17/2008 | CN101266264A Method for detecting network-free reactor high voltage frequency converter electric network voltage phase |
| 09/17/2008 | CN100419437C Indoor looped network cabinet intelligent nuclear phase method |
| 09/09/2008 | US7424379 Activity information meter |
| 09/09/2008 | US7423456 Fast response time, low power phase detector circuits, devices and systems incorporating the same, and associated methods |
| 09/04/2008 | WO2008106030A1 Methods and graphical user interfaces for displaying balance and correlation information of signals |
| 09/03/2008 | CN101258411A 相位检测器系统 A phase detector system |
| 08/27/2008 | CN201107355Y Time synchronization error measuring circuit based on CPLD technology |
| 08/27/2008 | CN101252348A Voltage controlled oscillator |
| 08/26/2008 | US7418071 Method and apparatus for generating a phase dependent control signal |
| 08/20/2008 | CN101246191A Phasor graphical representation method of electrical load impedance |
| 08/19/2008 | US7414388 Gain and phase detector having dual logarithmic amplifiers |
| 08/12/2008 | US7412339 Method and apparatus for identifying an operational phase of a motor phase winding and controlling energization of the phase winding |
| 08/06/2008 | CN201096836Y Phase detection device for CobraNet network audio signal |
| 08/05/2008 | US7409026 Device and method for detecting the phase of a signal |
| 07/30/2008 | EP0880707B1 Phase- and frequency detector |
| 07/22/2008 | US7403816 Method and apparatus for analyzing bioelectrical response waveform information, and diagnostic apparatus thereof |
| 07/10/2008 | US20080164862 Method and Device For Determination of the Phases in a Multi-Phase Electrical System |
| 07/01/2008 | US7394239 Method and circuit arrangement for the self-testing of a reference voltage in electronic components |