| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 07/11/2012 | CN202330589U 高精度多模式低压负荷功率特性记录仪 Multi-mode high-precision low-voltage load power characteristics logger |
| 07/11/2012 | CN202330555U 谐波检测电路装置 Harmonic detection circuit device |
| 07/11/2012 | CN202330554U 一种可检测频率的信号发生器 A detectable frequency signal generator |
| 07/11/2012 | CN102565676A Automation measuring apparatus for crystal oscillator parameters |
| 07/11/2012 | CN102565646A Lightning-wave surge-voltage type test device for dry sleeve and frequency band analysis method thereof |
| 07/11/2012 | CN102565546A Electromagnetic radiation scanning and positioning method |
| 07/11/2012 | CN102565532A Spectral analysis method and device for signal frequency of process control system |
| 07/11/2012 | CN102565531A Measurement instrument for dynamic parameters of piezoelectric transducer, and measurement methods for measurement instrument |
| 07/11/2012 | CN102565530A Automatic measuring instrument for crystal inflection point of oven-controlled crystal oscillator (OCXO) |
| 07/11/2012 | CN102565529A Low-power-consumption clock frequency detection circuit |
| 07/11/2012 | CN102565517A Converter detector |
| 07/05/2012 | WO2012090024A1 Photon frequency measurement system and method using complimentary electro‑optical modulation |
| 07/05/2012 | WO2012060883A3 Power grid failure prediction and detection |
| 07/04/2012 | CN202305668U 基于can总线的新能源发电电能质量监测装置 Based on new energy generation power quality monitoring devices can bus |
| 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 | CN1932534B Data processing method for spectrum analyzer |
| 07/04/2012 | CN102542262A Waveform identification method based on operating-characteristic working condition waveform library of high-speed rail |
| 07/04/2012 | CN102540013A Transformer substation grounding network frequency response test device |
| 07/04/2012 | CN102539915A Method for accurately calculating power harmonic wave parameters through adopting time delay Fourier transform frequency measurement method |
| 07/04/2012 | CN102539914A 3Ghz pulse frequency measurement method realized by using pulse broadband amplification and demodulation circuit |
| 07/04/2012 | CN102539913A Higher harmonic component testing apparatus |
| 07/04/2012 | CN102539912A Mains frequency detection method for load monitor |
| 07/04/2012 | CN101893652B Method for detecting harmonic wave and reactive current based on spatial transformation of voltage vectors |
| 07/04/2012 | CN101806834B Kalman filter-based signal real-time time-frequency spectrometer |
| 07/04/2012 | CN101806832B Measuring method for frequencies of low-frequency signals |
| 07/04/2012 | CN101782608B Radio frequency identification device (RFID) label response frequency standard test system and method |
| 07/03/2012 | US8212547 System and method for on-chip duty cycle measurement |
| 06/28/2012 | US20120166121 Apparatus for detecting real time clock frequency offset and method thereof |
| 06/28/2012 | US20120161749 Method for measuring absolute magnitudes and absolute phase relationships over a wide bandwidth |
| 06/27/2012 | CN202285032U 一种电子式互感器谐波影响测试装置 An electronic transformer harmonics testing device |
| 06/27/2012 | CN202285029U 基于虚拟仪器的电网谐波分析仪 Based on Virtual Instrument harmonic analyzer |
| 06/27/2012 | CN102520338A Delay time measurement circuit and delay time measurement method |
| 06/27/2012 | CN102520245A Micro-grid harmonic and inter-harmonic analysis method based on cubic spline interpolation waveform reconstruction |
| 06/27/2012 | CN102520244A Frequency signal detection circuit |
| 06/27/2012 | CN102519651A Method for determining basic frequency of stay cable when testing cable tension of cable stayed bridge by using vibration method |
| 06/27/2012 | CN102519579A Detection method of turbine collision and abrasion faults |
| 06/26/2012 | US8207727 RF circuit analysis |
| 06/21/2012 | US20120153971 System and method for testing an electrostatic chuck |
| 06/21/2012 | DE102011079398A1 Überwachung und Fehlerdiagnose einer elektrischen Maschine Monitoring and fault diagnosis of electrical machine |
| 06/20/2012 | CN202282326U 一种应用于射频多极杆的数字频率计 Applied to a multi-polar radio frequency digital frequency meter pole |
| 06/20/2012 | CN1980081B Detection and estimation of radio frequency variations, wireless network device and radar detection device |
| 06/20/2012 | CN102508124A Detection method of partial discharge of electrical equipment and device thereof |
| 06/20/2012 | CN102508082A High-precision multimode low-voltage load power property recording instrument and working method thereof |
| 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 | CN102508028A Device and method for detecting and analyzing harmonic |
| 06/20/2012 | CN102508027A Method for screening, separating and monitoring subsynchronous modal signals |
| 06/20/2012 | CN102508026A Harmonic wave analysis method for electric energy quality harmonic wave analyzer |
| 06/20/2012 | CN102508025A Signal recognition and triggering using computer vision techniques |
| 06/20/2012 | CN102508024A Frequency and phase difference precision measurement method based on frequency and phase relationship auxiliary processing |
| 06/20/2012 | CN102508023A Signal detection circuit and frequency detection method for shunt valve of dish-washing machine |
| 06/20/2012 | CN102508022A Method for detecting power grid frequency by using optimal multiplier Newton algorithm |
| 06/20/2012 | CN101727092B System and method for analyzing frequency spectrum |
| 06/20/2012 | CN101583881B Signal analyzer and its data generation method |
| 06/19/2012 | US8204706 Dynamic synchronization system and methods |
| 06/19/2012 | US8204632 Emergency frequency load shedding scheme |
| 06/19/2012 | US8203363 Frequency detection apparatus and method |
| 06/19/2012 | US8202058 Variable displacement piston machine with a sensor |
| 06/14/2012 | US20120150469 Electronic device cooling fan testing |
| 06/13/2012 | CN102495368A Non-invasive online detection method and system for rotor broken-bar fault of three-phase cage type asynchronous motor |
| 06/13/2012 | CN102495286A Harmonic detection and alarm device based on high-precision filters |
| 06/13/2012 | CN102495285A Method for estimating power harmonic wave parameter by using power gravity center of symmetric window function |
| 06/13/2012 | CN102495284A Circuit capable of realizing high resolution for measuring frequency and time |
| 06/13/2012 | CN102495283A Self-adaptive equal-precision frequency measuring method |
| 06/13/2012 | CN102495282A Measuring method of alternating current voltage frequency |
| 06/13/2012 | CN102495281A Method for measuring phasor frequency of power system |
| 06/13/2012 | CN102495280A Anti-noise wide-range frequency measurement method and phase locking frequency meter |
| 06/13/2012 | CN102065316B Automatic set top box level test device and method |
| 06/13/2012 | CN101738548B Clock pulse detecting circuit and clock pulse supply device |
| 06/12/2012 | US8200454 Method, data processing program and computer program product for time series analysis |
| 06/12/2012 | US8198944 Digitally controlled oscillator with improved digital frequency calibration |
| 06/07/2012 | WO2012075123A2 System frequency response test using continuous sweep frequencies |
| 06/07/2012 | WO2012050901A3 Fourier domain sensing |
| 06/07/2012 | US20120139554 Power Conductor Monitoring Device and Method of Calibration |
| 06/06/2012 | EP2461169A2 Method and device for measuring the frequency of a signal |
| 06/06/2012 | DE19655034B4 Testvorrichtung einer Halbleitereinrichtung The test device of a semiconductor device |
| 06/06/2012 | CN102486495A Signal delay time measurement method |
| 06/06/2012 | CN101963788B Method of verification strategy for bandwidth and phase of digital type power control system |
| 06/06/2012 | CN101655519B Data processing method for alternating current sampling of digital transformer station measurement and control device |
| 06/05/2012 | US8195422 Measuring the distance between devices |
| 06/05/2012 | US8195416 Fundamental wave beat component detecting method and measuring target signal sampling apparatus and waveform observation system using the same |
| 05/31/2012 | US20120136600 Using continuous sweep frequencies in a system frequency response test |
| 05/30/2012 | EP2457106A1 Frequency-selective measuring device and frequency-selective measuring method |
| 05/30/2012 | EP2456502A1 Ventricular shunt system and method |
| 05/30/2012 | CN202261475U RF (radio frequency) test port structure |
| 05/30/2012 | CN202256496U Power harmonic analysis apparatus based on FFT (fast Fourier transform) |
| 05/30/2012 | CN202256495U Dynamic frequency shift detection device for contact network |
| 05/30/2012 | CN102478605A Harmonic calculation method of 256 sampling points for power quality |
| 05/30/2012 | CN102478601A Harmonic calculation method for 64 sampling points of power quality |
| 05/30/2012 | CN101833062B Circuit checking method based on circuit checking instrument |
| 05/29/2012 | US8190388 Method and system for detecting Bluetooth signals utilizing a wideband receiver |
| 05/29/2012 | US8190387 Frequency measurement apparatus |
| 05/24/2012 | US20120130665 Time domain electromagnetic interference monitoring method and system |
| 05/24/2012 | US20120126902 High-precision and low-consumption quartz oscillator |
| 05/23/2012 | CN202230173U Self-adaptive multi-harmonic-source positioning device |
| 05/23/2012 | CN202230133U Multipath detection device for stability of frequency signals |
| 05/23/2012 | CN102467313A 频谱分析仪的读值应用方法及装置 Spectrum analyzer reading application method and apparatus |
| 05/23/2012 | CN102466764A 一种频谱超限测量模板的生成方法和装置 A gauge measuring the spectral template generation method and apparatus |