| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 01/01/2014 | CN103487648A Sigma-delta PLL frequency measuring circuit and method |
| 01/01/2014 | CN102565676B Automation measuring apparatus for crystal oscillator parameters |
| 12/29/2013 | CA2816774A1 Systems and methods for measuring the frequency of signals generated by high frequency medical devices |
| 12/27/2013 | CA2875336A1 Electric power system waveform search |
| 12/26/2013 | US20130341922 Method and module for measuring the rate of change of frequency of waveforms related to converter units in wind turbine generators |
| 12/25/2013 | EP2677325A2 Physical quantity measuring apparatus and physical quantity measuring method |
| 12/25/2013 | CN203365545U Face recognition spectrum analyzer |
| 12/25/2013 | CN203365544U Detection circuit for resonant frequency and integrated circuit |
| 12/25/2013 | CN203364965U Light signal detection device based on equal precision frequency measurement |
| 12/25/2013 | CN103472338A Magnetron test system and method |
| 12/25/2013 | CN103472300A Simple digital frequency meter |
| 12/25/2013 | CN103472299A High-resolution transient frequency stability measuring method |
| 12/25/2013 | CN103471988A Card performance detection system |
| 12/25/2013 | CN102508124B Detection method of partial discharge of electrical equipment |
| 12/19/2013 | WO2013185436A1 Distributed spectrum analyzer and method of spectrum analysis applying same |
| 12/19/2013 | US20130338954 Alternating-current electrical quantity measuring apparatus and alternating-current electrical quantity measuring method |
| 12/18/2013 | CN203350371U Device for detecting 13MHz crystal oscillator of base station |
| 12/18/2013 | CN203350360U A hand-held harmonic detection apparatus |
| 12/18/2013 | CN203350359U Frequency measuring apparatus |
| 12/18/2013 | CN203350354U Digital display combination meter |
| 12/18/2013 | CN203350336U Multi-function voltage frequency table |
| 12/18/2013 | CN203350323U Capacitance-type voltage transformer applicable to high-voltage harmonic measurement |
| 12/18/2013 | CN103454496A Method for knock detection |
| 12/18/2013 | CN103454495A Self-adaptive high-precision fast spectral analysis method |
| 12/18/2013 | CN103454494A High-precision harmonic analysis method |
| 12/18/2013 | CN102353837B Method and device for measuring pulse frequency |
| 12/17/2013 | US8612182 Methods and systems for isolating a frequency in a rotating machine |
| 12/12/2013 | US20130332097 Information processing method and apparatus for deciding control parameters |
| 12/12/2013 | US20130328576 Measurement of transistor gate source capacitance on a display system substrate using a replica transistor |
| 12/11/2013 | EP2671089A1 Method for measuring transmission frequencies using a rotary interferometer |
| 12/11/2013 | CN203337732U 电子频率计数器 Electronic Frequency Counter |
| 12/11/2013 | CN103439575A Method for unknown signal automatic search for spectrum analyzer |
| 12/11/2013 | CN103439574A Synchronous restraining method for narrow-band interference in direct-current line corona current measurement data |
| 12/11/2013 | CN102621382B Method for detecting frequency, phase and amplitude of electric signal in electric power system |
| 12/11/2013 | CN102393488B Harmonic analysis method |
| 12/10/2013 | US8604808 Indicator position detecting device and indicator position detecting method |
| 12/05/2013 | US20130325383 Monitoring and Analysis of Power System Components |
| 12/05/2013 | DE102012209227A1 Method for measuring fundamental frequency of line signal of power line, involves calculating fundamental frequency of line signal based on full cycles of digital sample and position of first and last zero crossing of full cycle |
| 12/04/2013 | CN103424622A Detecting and determining method of fractional harmonic source |
| 12/04/2013 | CN103424621A Artificial neural network detecting method of harmonic current |
| 12/04/2013 | CN103424620A 10kV distribution network harmonic source identification method based on time sequence relevancy |
| 12/04/2013 | CN103424619A Timing counter frequency measurement system and method |
| 12/04/2013 | CN103424618A Photonic microwave frequency measurement method and device |
| 12/04/2013 | CN102590612B Intelligent time frequency signal switcher |
| 11/28/2013 | WO2013173975A1 Harmonic detection method and relevant device |
| 11/27/2013 | EP2667203A1 Automatically detecting in-band but out-of-span power in a frequency-domain test and measurement instrument |
| 11/27/2013 | CN203310913U Wideband harmonic collection system based on sub-band dual filtering |
| 11/27/2013 | CN203310912U Axle counting frequency signal detection circuit |
| 11/27/2013 | CN103412188A SFM signal parameter estimation method based on Bessel function and Toeplitz algorithm |
| 11/27/2013 | CN103412171A Extreme learning machine-based power grid harmonic voltage signal detection method |
| 11/27/2013 | CN102435844B Sinusoidal signal phasor calculating method being independent of frequency |
| 11/27/2013 | CN101937069B Voltage characteristic detection system and method of SOC (System On Chip) intelligent electric meter |
| 11/26/2013 | US8594961 Remote interrogation of a passive wireless antenna sensor |
| 11/26/2013 | US8593132 Parameter calculating apparatus and simulation apparatus |
| 11/26/2013 | US8593131 Signal generation circuit, frequency measurement device including the signal generation circuit, and signal generation method |
| 11/26/2013 | US8591722 Method for determination of analyte concentrations and related apparatus |
| 11/21/2013 | US20130307632 Time Base Management System |
| 11/21/2013 | US20130307524 Inferring the periodicity of discrete signals |
| 11/21/2013 | DE102012208405A1 Messgerät und Verfahren zur verbesserten Abbildung von Spektralverläufen Instrument and method for improved imaging of Spektralverläufen |
| 11/20/2013 | CN203299272U Handheld spectrum analyzer |
| 11/20/2013 | CN203299271U High and low voltage power distribution cabinet based on power utilization environment harmonic pollution monitoring |
| 11/20/2013 | CN203299270U Device for accurately measuring CVT grid-side voltage harmonic wave |
| 11/20/2013 | CN103403561A Ac electric quantity measuring device and ac electric quantity measuring method |
| 11/20/2013 | CN103399206A WAMS (wide area measurement system) based method for discriminating stabilization of transient frequency of power system |
| 11/20/2013 | CN103399205A Alarming device and method for detecting harmonic waves of vehicle-mounted converter |
| 11/20/2013 | CN103399204A Rife-Vincent (II) window interpolation FFT (Fast Fourier Transform)-based harmonic and inter-harmonic detection method |
| 11/20/2013 | CN103399203A High-precision harmonic parameter estimation method based on composite iterative algorithm |
| 11/20/2013 | CN103399202A Phase locking method for control system of variable-speed pump storage group |
| 11/20/2013 | CN102262182B Method for detecting island of photovoltaic grid-connected inverter |
| 11/19/2013 | US8589104 Device and method for compensating color shifts in fiber-optic imaging systems |
| 11/19/2013 | US8587383 Measuring bias temperature instability induced ring oscillator frequency degradation |
| 11/14/2013 | DE102012009317A1 Vorrichtung und Verfahren zur Lokalisierung von PIM-Störstellen Device and method for localizing defects PIM |
| 11/13/2013 | EP2662701A1 Receiver sequencing method |
| 11/13/2013 | CN203287435U A micro electrical network harmonic wave and inter-harmonic wave test apparatus based on an STM32F107VCT6 |
| 11/13/2013 | CN203287434U Module applicable to high-frequency harmonic detection of power quality |
| 11/13/2013 | CN203287433U Portable universal radar frequency measuring instrument |
| 11/13/2013 | CN103389413A Real-time statistical method for frequency spectrum histogram |
| 11/13/2013 | CN103389412A Measuring method and measuring device for electrical parameters of power grid comprising small power generator |
| 11/13/2013 | CN101523224B Realtime spectrum trigger system on realtime oscilloscope |
| 11/12/2013 | US8581571 Measuring apparatus, testing apparatus and measuring method |
| 11/12/2013 | US8581570 Frequency error detection apparatus |
| 11/07/2013 | WO2013110691A3 Wind farm harmonic predictor, and method therefor |
| 11/06/2013 | EP2660613A1 Method and module for measuring the rate of change of frequency of waveforms related to converter units in wind turbine generators. |
| 11/06/2013 | CN203278387U Automatic change-over switch with phase and frequency detection device |
| 11/06/2013 | CN203275542U Lightning traveling wave characteristic test system of transmission lines |
| 11/06/2013 | CN203275527U Current transformer bridge principle-based loss factor and loss current testing device |
| 11/06/2013 | CN203275519U GPIB interface based frequency detection automatic test system |
| 11/06/2013 | CN103383413A Real-time harmonic detection method based on direct weight determination method |
| 11/06/2013 | CN103383412A Adaptive software and hardware frequency tracking and sampling method |
| 11/06/2013 | CN103383411A Method and module for measuring the rate of change of frequency of waveforms related to converter units in wind turbine generators |
| 11/06/2013 | CN102486495B Signal delay time measurement method |
| 11/06/2013 | CN102334038B Phase determining device and frequency determining device |
| 11/06/2013 | CN102175917B Online nonlinear spectrum analysis and fault diagnosis instrument |
| 11/06/2013 | CN102156221B Photon-integrated-circuit-based instantaneous microwave frequency measurement device and method |
| 11/05/2013 | US8575914 Frequency measuring apparatus |
| 10/31/2013 | US20130289914 Flexible evaluation of free space over the air measurement uncertainty method and apparatus |
| 10/31/2013 | US20130289911 Power converter resonance detection apparatus and method |
| 10/31/2013 | US20130285752 Reference-Less Frequency Detector |
| 10/31/2013 | US20130285740 Dynamic characterisation of amplifier am-pm distortion |
| 10/31/2013 | DE102012207021A1 Messgerät, Kalibriergerät, Messsystem und Verfahren mit dynamischem Datenblatt Meter, Calibrator, measuring system and method with dynamic data sheet |