| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 11/01/2011 | US8049487 Power measurement circuit |
| 10/26/2011 | EP2174148B1 Analog to digital conversion system |
| 10/26/2011 | CN102227643A Display of spectra |
| 10/25/2011 | US8044726 Systems and methods for self testing a voltage controlled oscillator |
| 10/25/2011 | US8044655 Pulse measurement apparatus and method |
| 10/20/2011 | WO2011128419A1 Apparatus and method for measuring the oscillations of an oscillator |
| 10/20/2011 | WO2011128071A1 Method for locating defective locations in an rf signal transmission path by detecting an intermodulation product |
| 10/20/2011 | WO2011128070A1 Method for locating faulty points in a high-frequency signal transmission path by detecting an intermodulation product |
| 10/20/2011 | US20110257918 Spectrum searching method that uses non-chemical qualities of the measurement |
| 10/20/2011 | US20110254534 Non-contact arc detection apparatus and method |
| 10/20/2011 | DE102010027829A1 Vorrichtung und Verfahren zur Messung der Oszillationen eines Oszillators Apparatus and method for measuring the oscillations of the oscillator |
| 10/19/2011 | EP2376931A2 Method and network analyser for measuring group runtime in a measuring object |
| 10/19/2011 | CN202013379U Passive RFID (Radio Frequency Identification Devices) electric label card resonance frequency point testing device |
| 10/19/2011 | CN102221643A Converter harmonic detector of direct current mine hoist |
| 10/19/2011 | CN101793920B Compact transient microwave frequency photon measurement system |
| 10/19/2011 | CN101635455B Method for calibrating characteristic waves of power network by utilizing clock stamp and system |
| 10/18/2011 | US8041534 Sensor device, and sensor system and electronic device using the sensor device |
| 10/18/2011 | US8040125 Device and method for the analysis of a measured signal transmitted via a multi-channel system |
| 10/12/2011 | CN101718809B System and method for acquiring power quality data |
| 10/11/2011 | US8035369 Method for detecting an isolated network |
| 10/06/2011 | US20110241652 Method and arrangement for estimating angular frequency |
| 10/06/2011 | US20110241651 Indicator position detecting device and indicator position detecting method |
| 10/05/2011 | CN202003176U Control device of digital frequency meter |
| 10/05/2011 | CN202002973U Network multifunctional power meter |
| 10/05/2011 | CN102208817A Reactive-power-disturbance-based grid-connected island detection method for photovoltaic system |
| 10/05/2011 | CN102207532A Oil paper insulation early stage discharge defect diagnosis method |
| 10/05/2011 | CN102207521A Method and arrangement for estimating angular frequency |
| 10/04/2011 | US8032850 Structure for an absolute duty cycle measurement circuit |
| 10/04/2011 | US8031017 Method and apparatus for determining within-die and across-die variation of analog circuits |
| 10/04/2011 | US8030947 Electronic apparatus noise measurement method |
| 09/29/2011 | WO2011071760A3 Method and apparatus for measuring the phase change of a sound wave propagating through a conduit |
| 09/29/2011 | US20110234287 Frequency detection mechanism for a clock generation circuit |
| 09/29/2011 | US20110234201 High-frequency measuring device and high-frequency measuring device calibration method |
| 09/28/2011 | CN102200548A Tester for electronic tag |
| 09/28/2011 | CN101713811B System for automatically testing parameters of quartz crystal oscillator |
| 09/28/2011 | CN101501506B Device and method for measuring the frequency of a signal coded modulated carrier signal |
| 09/27/2011 | US8026728 Spectrum analyzers with dynamic range indicator and methods of use |
| 09/22/2011 | WO2011116218A2 Frequency measuring and control apparatus with integrated parallel synchronized oscillators |
| 09/22/2011 | WO2011115836A2 Configurable electronic device reprogrammable to modify the device frequency response |
| 09/21/2011 | EP2366118A1 Wideband digital receiver comprising a phase jump detection mechanism |
| 09/21/2011 | EP2366117A1 Wideband digital receiver comprising a signal detection mechanism |
| 09/21/2011 | CN201985543U 配电监测无功补偿控制器 Distribution Monitoring reactive power compensation controller |
| 09/21/2011 | CN102193496A Method for detecting real time clock (RTC) oscillator and calculator system |
| 09/21/2011 | CN102193046A Diagnostic device for electric machine, diagnostic method and carrier of diagnostic device |
| 09/21/2011 | CN102193029A Method for measuring short-term frequency stability of unconventional sampling time |
| 09/21/2011 | CN102193028A Detecting device and detecting method for resonant frequency of electro-optic phase modulator |
| 09/21/2011 | CN102193023A Synchronization detecting circuit and automatic synchronous parallelization apparatus |
| 09/20/2011 | US8024143 Method for ascertaining a mains frequency in a voltage signal, and mains analyzer |
| 09/20/2011 | US8022687 Secum-trahenz method, especially for a network analyzer, for measurement of a device |
| 09/15/2011 | WO2011063328A3 Logarithmic mean-square power detector |
| 09/15/2011 | DE102011001238A1 Überwachungsvorrichtung sowie Verfahren zum Überwachen einer Dicke eines Siliziumwafers und Dünnungsvorrichtung zum Dünnen eines Siliziumwafers Monitoring device and method for monitoring a thickness of a silicon wafer and a silicon wafer for thinning Dünnungsvorrichtung |
| 09/14/2011 | CN201974478U 可降低噪声提高灵敏度的光电转换谐波信号探测装置 Noise can be reduced to improve the sensitivity of the photoelectric conversion apparatus of the harmonic signal detection |
| 09/14/2011 | CN201974477U 一种电网谐波检测分析装置 One kind of harmonic detection and analysis apparatus |
| 09/14/2011 | CN201974476U 智能频率变送器 Intelligent frequency transmitter |
| 09/14/2011 | CN201974470U 中频电参数测量仪器 IF electrical parameter measuring instrument |
| 09/14/2011 | CN102185601A Keystroke function realizing method and device for hand-held frequency spectrograph |
| 09/14/2011 | CN102185319A Resonance wave detecting and phase-locking method and device for active power filter |
| 09/14/2011 | CN102183691A Double-tuned microwave spectrum analyzer |
| 09/14/2011 | CN101762746B Cyclostationary demodulation method of complex gear transmission chain current signal based on entropy optimization |
| 09/14/2011 | CN101639499B Device and method for measuring small signal harmonic distortion traced by fundamental waves |
| 09/14/2011 | CN101479612B Frequency measuring instrument |
| 09/13/2011 | US8018744 Power factor correction by measurement and removal of overtones |
| 09/13/2011 | US8018243 Measurement signal processing |
| 09/13/2011 | US8016997 Method for determination of analyte concentrations and related apparatus |
| 09/09/2011 | WO2011107801A1 Sampling |
| 09/09/2011 | WO2011106862A1 Dynamic synchronization system |
| 09/09/2011 | CA2793710A1 Dynamic synchronization system |
| 09/08/2011 | US20110215795 Detector and detection method |
| 09/08/2011 | DE102010019706A1 Device for use in frequency modulation stereo receiver for mobile radio telephone for phase- and frequency-coherent recovery of pilot-tone signal from input signal, has reference pilot tone unit connected with inputs of two mixers |
| 09/07/2011 | CN102175918A Universal digital geophone implementation method and device |
| 09/07/2011 | CN102175917A Online nonlinear spectrum analysis and fault diagnosis instrument |
| 09/07/2011 | CN102175916A Short sample dense frequency signal parameter measurement method |
| 09/07/2011 | CN102175915A Current characteristic frequency extraction method of machine tool transmission system with immune random resonance |
| 09/07/2011 | CN102175445A Simulation test device for hydroturbine speed-regulating system |
| 09/07/2011 | CN101701986B System for pre-testing and diagnosing electro magnetic interference of electronic equipment and method thereof |
| 09/07/2011 | CN101629977B Disconnection protection circuit for frequency sensor |
| 08/31/2011 | CN201955395U 一种传感器频率变送器电路 A sensor frequency transmitter circuit |
| 08/31/2011 | CN102170267A Trigger generation for digital modulation signal analysis |
| 08/31/2011 | CN102170141A Method and area electric power system detecting islanding by employing controlled reactive power injection by a number of inverters |
| 08/31/2011 | CN102169140A Clock frequency detection circuit |
| 08/31/2011 | CN101738553B Universal testing system of frequency transformer and current transformer |
| 08/30/2011 | US8008907 Delay line calibration circuit comprising asynchronous arbiter element |
| 08/30/2011 | US8008905 Waveform observing apparatus |
| 08/25/2011 | WO2011101097A1 A method of subsynchronous resonance detection |
| 08/25/2011 | WO2011101025A1 Digital clock regenerator |
| 08/25/2011 | US20110206139 Block distortion detection method, block distortion detection apparatus, block distortion removal method, and block distortion removal apparatus |
| 08/24/2011 | EP2359152A1 Display of spectra |
| 08/24/2011 | CN201945849U 调频机的测试装置 FM machine test device |
| 08/24/2011 | CN201945629U 光伏逆变器交流电压采样电路 PV inverter AC voltage sampling circuit |
| 08/24/2011 | CN102165324A Frequency characteristic measurement device |
| 08/24/2011 | CN102162828A Device and method for qualitatively detecting PCB (printed circuit board) board electromagnetic interference radiation performance |
| 08/24/2011 | CN101694508B Motor rotor classical failure diagnosis method based on low subharmonic shaft voltage signals |
| 08/24/2011 | CN101484814B System for extraction and analysis of radio signals |
| 08/24/2011 | CN101285866B Electronic soft label checking sensor |
| 08/23/2011 | US8005633 Excitation signal generator for improved accuracy of model-based testing |
| 08/23/2011 | US8003946 Method for detecting localized defects present in a mineral fiber mat |
| 08/17/2011 | EP2357483A1 A method of subsynchronous resonance detection |
| 08/17/2011 | CN102156639A Method for realizing embedded spectrum-analyzer display interface based on Java |
| 08/17/2011 | CN102156233A Method for detecting island by intermittent two-sided reactive power disturbance |
| 08/17/2011 | CN102156221A Photon-integrated-circuit-based instantaneous microwave frequency measurement device and method |