| 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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| 09/19/2012 | CN102680824A Electric energy quality detecting and analyzing system for pantograph-catenary current collection based on DSP (Digital Signal Processor) |
| 09/19/2012 | CN102680785A Synchronous phasor measurement method based on self-adoption variable window |
| 09/19/2012 | CN102680784A United low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers |
| 09/13/2012 | US20120232820 grid oscillation analysis method and apparatus therefor |
| 09/12/2012 | CN102667506A Measuring phase noise in radio frequency, microwave or millimeter signals based on photonic delay |
| 09/11/2012 | US8263275 Fuel cell system having a control unit for measuring impedance |
| 09/05/2012 | CN202421336U High-accuracy magnitude-phase detecting system |
| 09/05/2012 | CN202421335U Locomotive synchronizing signal phase detector, locomotive power supply system and electric locomotive |
| 09/05/2012 | CN202421334U Accessory tool for checking phase of switch cabinet |
| 09/05/2012 | CN202421333U Phase tester of 25 Hz phase-sensitive track circuit |
| 09/05/2012 | CN202421317U Capacitance inductance automatic tester for vehicle loading usage |
| 09/04/2012 | US8258798 On chip duty cycle measurement module |
| 09/04/2012 | US8258775 Method and apparatus for determining phase error between clock signals |
| 08/30/2012 | WO2012115736A1 Machine systems including pre-power diagnostics |
| 08/30/2012 | US20120217953 Methods for Sensing Cycle and Phase Difference of AC Signals |
| 08/29/2012 | CN102650692A Method for detecting and repairing cycle slip by utilizing BeiDou three-frequency observed quantity |
| 08/22/2012 | CN102645585A Synchronous rapid measuring method and device for ultralow frequency sinusoidal signal phase difference |
| 08/22/2012 | CN102645577A Digital frequency selection measuring system capable of resisting one hundred thousand times of interference |
| 08/22/2012 | CN102004241B Autotracking phase zero value calibration device of system for measuring wave beam waveguide receiving on ground |
| 08/22/2012 | CN101943719B Shared-frequency asynchronous phase-checking method |
| 08/22/2012 | CN101930028B Power phase detection device, and method |
| 08/22/2012 | CN101865963B New quick detection method for relay protective device |
| 08/22/2012 | CN101726665B Three-phase potential detecting method of low-voltage carrier wave power line for communication |
| 08/21/2012 | US8248104 Phase comparator and phase-locked loop |
| 08/16/2012 | US20120206154 Input device interference determination |
| 08/15/2012 | CN202383199U Phase sequence and zero cross detection circuit structure |
| 08/14/2012 | US8241802 Fuel cell system with constantly accurate impedance measurement |
| 08/08/2012 | CN102629740A Nuclear phase handcart with adjustable width |
| 08/02/2012 | US20120194170 Load Detection for Switched-Mode Power Converters |
| 08/01/2012 | EP2480902A2 Measuring phase noise in radio frequency, microwave or millimeter signals based on photonic delay |
| 08/01/2012 | CN202362383U Phase calibration device of digital substation based on composite sampling |
| 08/01/2012 | CN202362382U Phase identification device for three-phase alternating current power supply |
| 08/01/2012 | CN102621382A Method for detecting frequency, phase and amplitude of electric signal in electric power system |
| 08/01/2012 | CN102621373A Signal collection device and signal processing method of current-sharing input system of alternating-current power supply |
| 07/25/2012 | CN102608483A Direction diagnosing system of grounded fault of small current grounded distribution system |
| 07/25/2012 | CN101907656B Method for measuring phase difference of common-frequency signal with fixed phase drift |
| 07/25/2012 | CN101788614B High and low voltage integrated phase-sequence phase meter and detection method thereof |
| 07/25/2012 | CN101609136B Voltage transformer secondary voltage drop tester and phase-angle difference testing method thereof |
| 07/19/2012 | US20120182658 Low-Power Magnetic Slope Detecting Circuit |
| 07/18/2012 | CN202339384U 一种无线语音高压核相装置 A wireless voice high-pressure nuclear phase device |
| 07/18/2012 | CN102590645A Phase testing method for alternating current high-voltage power supply circuit by using single-pole phase testing device |
| 07/18/2012 | CN102590619A Method for detecting time synchronization capacity of real-time measurement equipment based on timing variable |
| 07/18/2012 | CN102590618A Detection method of positive sequence voltage phase of fundamental wave for power grid |
| 07/18/2012 | CN102590613A Method and device for measuring arrival time difference of radio-frequency signal |
| 07/18/2012 | CN101789601B Real time digital system (RTDS) phase-locking synchronous element |
| 07/17/2012 | US8224606 Measuring clock jitter |
| 07/17/2012 | US8222909 Electroporation system with dial-in time constant |
| 07/12/2012 | US20120176119 Phase line identification system and method |
| 07/12/2012 | DE10151173B4 Verfahren zum Messen des Modulationsfehlers von digital modulierten Hochfrequenzsignalen A method for measuring the modulation error of digitally modulated high frequency signals |
| 07/11/2012 | CN202330556U Plc相别校验器 Relative to other validators Plc |
| 07/11/2012 | CN102565617A Method for inspecting current loop of main transformer sleeve by using zero lifting flow |
| 07/11/2012 | CN102565533A Method for checking phase relationship of generator-transformer current and voltage in short circuit detection before grid connection |
| 07/05/2012 | US20120169322 Phase identification system and method |
| 07/04/2012 | CN202309650U 基于fpga的硬件鉴相电路 Fpga based hardware phase circuit |
| 07/04/2012 | CN202305656U Photovoltaic inverter grid-connected intelligent detection device |
| 07/04/2012 | CN202304888U 一种相位频率时间测量仪 A phase frequency-time measuring instrument |
| 07/04/2012 | CN102540130A Signal separating method applied to on-line angular difference monitoring system of current sensor |
| 07/04/2012 | CN102539975A Method for carrying out synchronous on-line detection on data of 10kV merging units (MUs) based on voltage-phase comparison |
| 07/04/2012 | CN102539916A Synchronous phasor measuring device of ship electrical power system |
| 07/04/2012 | CN102539877A Resistive current energized monitoring system for metal oxide arrester (MOA) based on compass synchronous time service |
| 07/04/2012 | CN102539867A Intelligent phase voltammeter and measurement method thereof |
| 07/04/2012 | CN101854063B Device and method for detecting power phase in energy feedback device |
| 07/04/2012 | CN101813725B Method for measuring phase difference of low-frequency signals |
| 07/04/2012 | CN101082642B Method and device for sampling electric signals of a multiphase electric installation |
| 06/29/2012 | CA2762732A1 Phase identification system and method |
| 06/27/2012 | CN102520246A Constant frequency phasor extraction method |
| 06/27/2012 | CN101762768B Method for analyzing autotransformer differential protection CT circuit connection |
| 06/27/2012 | CN101082649B Method for testing three phases power supply of flying vehicle and tool set |
| 06/21/2012 | US20120153933 Method and system for producing a signal with a power change determined by a phase or frequency difference between two signal sources |
| 06/21/2012 | DE10164119B4 Elektrisches Hochspannungsnetz High-voltage electric power |
| 06/20/2012 | CN102508032A Method for measuring attenuation and phase shift of detection signal |
| 06/20/2012 | CN102508031A Fourier series based measurement method of phase angle of partial discharge pulse |
| 06/20/2012 | CN102508030A Data processing system and message method based on IPC (industrial personal computer) synchronized phasor measurement unit |
| 06/20/2012 | CN102508029A Phase angle tracking method for power grid |
| 06/20/2012 | CN102508008A System and method for detecting amplitude-phase of voltage dip of grid-connected bus of wind power generation system |
| 06/20/2012 | CN101701992B Electrified tester of digital wireless type zinc oxide arrester |
| 06/14/2012 | US20120150462 Detection of Magnetic Fields Using Leading Power Factor |
| 06/14/2012 | US20120146621 Volumetric induction phase shift detection system for determining tissue water content properties |
| 06/13/2012 | CN101512871B Phasor representation for generating electric entity of polyphase AC electric power system |
| 06/12/2012 | US8200445 Power supply noise analysis method, system and program for electronic circuit board |
| 06/12/2012 | US8198904 Synchrophasor measuring device and inter-bus-line phase angle difference measurement unit using the same |
| 06/06/2012 | CN202267713U 三相电压的相位获取电路 Get the phase-phase voltage circuit |
| 05/30/2012 | CN202256537U Electric vehicle charging power demand predicting system |
| 05/30/2012 | CN202256497U High sensitivity phase recognizer |
| 05/30/2012 | CN102478649A 旋转电位计的测量方法 Methods of measurement of rotary potentiometers |
| 05/24/2012 | US20120130681 Method, device and computer program product for magnetic tamper detection in a meter |
| 05/24/2012 | US20120126783 Self timed current integrating scheme employing level and slope detection |
| 05/23/2012 | CN102466765A 电源逆变装置及其电源相位检测电路 Power inverter device and the power phase detection circuit |
| 05/23/2012 | CN101915884B Identification method of ground fault phases in three-phase ungrounded system and identification device thereof |
| 05/23/2012 | CN101673954B Phase-locked loop and phase locking method of grid voltage phase measurement in grid-connection |
| 05/22/2012 | US8185328 Device, method, and program for measuring signal, and recording medium |
| 05/16/2012 | CN102460980A 发送机相移的确定和补偿 Phase shift of the transmitter is determined and compensated |
| 05/16/2012 | CN101963644B Oscillation center capturing method for out-of-step oscillation of power system |
| 05/15/2012 | US8181058 Clock-data-recovery technique for high-speed links |
| 05/15/2012 | US8179163 Method and apparatus for charge pump linearization in fractional-N PLLs |
| 05/10/2012 | US20120111963 Systems and methods for driving sealed nebulizers |
| 05/09/2012 | CN102445660A Gray Verhulst model-based prediction method of power angle of generator |
| 05/09/2012 | CN102445600A Optimization method based on traditional phase difference measurement and circuit |
| 05/08/2012 | US8174253 Systems and methods that detect changes in incident optical radiation |
| 05/03/2012 | DE102010050247A1 Steuerungssystem für eine Kompaktiervorrichtung A control system for a compactor |