| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 08/21/2013 | CN203149027U Voltage fluctuation and flicker detection apparatus based on energy operator and frequency spectrum correction |
| 08/21/2013 | CN103259534A Method for improving scanning linearity of signal analyzer |
| 08/21/2013 | CN103257271A Device and method for detecting micro grid harmonic wave and inter-harmonics based on STM32F107VCT6 |
| 08/21/2013 | CN103257270A Fourier-series-based method for analyzing sawtooth carrier wave chaos SPWM spectrums |
| 08/21/2013 | CN103257269A Harmonic source modeling method based on actual measured current characteristic curve fitting |
| 08/21/2013 | CN102495285B Method for estimating power harmonic wave parameter by using power gravity center of symmetric window function |
| 08/21/2013 | CN102305889B Dual mode 220v user side power grid phasor measuring and transmitting device and method |
| 08/20/2013 | US8515676 Method and apparatus for assessing the integrity of a rock mass |
| 08/14/2013 | DE102008039195B4 Verfahren und Elektronikvorrichtung zum Erfassen der Frequenz eines Eingangstaktsignals einer integrierten Schaltung und integrierte Schaltung A method and electronic device for detecting the frequency of an input clock signal, an integrated circuit and integrated circuit |
| 08/14/2013 | CN203133170U A power harmonic wave online monitoring device |
| 08/14/2013 | CN203133169U Device employing novel wiring method for detecting current harmonic quality |
| 08/14/2013 | CN203133168U Power harmonic detector |
| 08/14/2013 | CN203133167U Atomic frequency standard frequency drift rate detection system |
| 08/14/2013 | CN203133166U Novel digital frequency sweeper |
| 08/14/2013 | CN203132599U FFT double-probe constant-vibration-resistant vortex signal processing system based on ARM |
| 08/14/2013 | CN103248116A Automatic change-over switch with two-circuit feeding system phase difference detecting device |
| 08/14/2013 | CN103245832A Harmonic time frequency characteristic parameter estimating method based on fast S conversion and analysis meter |
| 08/14/2013 | CN103245831A Method for harmonic identification based on generalized Kalman filter |
| 08/14/2013 | CN103245830A Inter-harmonic detection method combining AR spectrum estimation and non-linear optimization |
| 08/14/2013 | CN102426292B Microwave pulse frequency measurement method |
| 08/14/2013 | CN102331525B Distributed type on-line harmonic detecting system based on Internet of construction equipment |
| 08/13/2013 | US8509372 Multi-band clock generator with adaptive frequency calibration and enhanced frequency locking |
| 08/13/2013 | US8509296 Spectrum analyzer and spectrum analysis method |
| 08/13/2013 | US8508239 Non-destructive signal propagation system and method to determine substrate integrity |
| 08/13/2013 | US8508213 Frequency measurement device |
| 08/08/2013 | WO2013113891A1 Determining a phase and a frequency of an electric quantity of an operating electrical device |
| 08/08/2013 | US20130204555 Method and Apparatus for Electrically Locating a Fault in a Cable |
| 08/07/2013 | EP2623997A1 Determining a phase and a frequency of an electric quantity of an operating electrical device |
| 08/07/2013 | EP2622358A1 Method and arrangement for frequency determination |
| 08/07/2013 | CN203117308U High-power electrical appliance arc fault detection system |
| 08/07/2013 | CN203117288U Spectrum analysis system of modem |
| 08/07/2013 | CN203117287U Frequency comparison device |
| 08/07/2013 | CN203117286U Wide-range and high-precision frequency meter based on single chip microcomputer |
| 08/07/2013 | CN103235181A Harmonic detection method based on wavelet transformation and instantaneous reactive power theory |
| 08/07/2013 | CN103235180A Inter-harmonics measuring method for power grid |
| 08/07/2013 | CN103235179A Frequency mask trigger with non-uniform bandwidth segments |
| 08/07/2013 | CN103235178A Double-button equal-precision frequency meter and calculating method thereof |
| 08/07/2013 | CN103235177A Three-phase alternating current frequency sampling method realized by software algorithm |
| 08/07/2013 | CN102411101B Calculation method of transformer harmonic loss based on frequency conversion property |
| 08/07/2013 | CN101839965B Measuring method for quantity of driven rubidium atom frequency standard residual magnetic field |
| 08/06/2013 | US8502612 Method and apparatus for determining within-die and across-die variation of analog circuits |
| 08/06/2013 | US8502523 Test apparatus and test method |
| 08/01/2013 | US20130193952 System and Method for Verifying the Operating Frequency of Digital Control Circuitry |
| 08/01/2013 | US20130193951 Convolution Integral for Synchronized Phasor |
| 08/01/2013 | CA2861955A1 Wind farm harmonic predictor, and method therefor |
| 07/31/2013 | EP2619932A1 Method and system for determining the origin of passive intermodulation products |
| 07/31/2013 | CN203101510U Portable frequency spectrum analyzer |
| 07/31/2013 | CN203101509U Intelligent frequency meter of water-pumping energy-storing power station |
| 07/31/2013 | CN103229062A Method for measurement of total harmonic distortion |
| 07/31/2013 | CN103226169A Square wave detector for wireless wake-up circuit |
| 07/31/2013 | CN102542262B Waveform identification method based on operating-characteristic working condition waveform library of high-speed rail |
| 07/31/2013 | CN102322942B Vibration signal vector ellipse spectrum analyzing method of rotating machinery |
| 07/31/2013 | CN102175916B Short sample dense frequency signal parameter measurement method |
| 07/31/2013 | CN102109552B High-frequency and high-speed frequency testing system and method based on phase locking technique |
| 07/25/2013 | US20130191062 Domain Identification and Separation for Precision Measurement of Waveforms |
| 07/24/2013 | CN203084080U Detection apparatus for atom ground state hyperfine 0-0 transition central frequency |
| 07/24/2013 | CN203081425U Intelligent oil pumping unit stroke frequency displayer |
| 07/24/2013 | CN103217575A Signal-sensitive data compression |
| 07/24/2013 | CN102385003B Method for detecting frequency and phase of voltage signals or current signals in electric power system |
| 07/24/2013 | CN102305886B Fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage |
| 07/24/2013 | CN102135569B Fluctuation quantity method-based user side harmonic emission level practicality estimation method |
| 07/23/2013 | US8493095 Semiconductor device with clock stop detection |
| 07/23/2013 | US8493058 Circuit arrangement for frequency determination |
| 07/18/2013 | US20130182815 Method and arrangement for frequency determination |
| 07/17/2013 | CN203069671U Harmonic analysis system |
| 07/17/2013 | CN203069669U Harmonic energy measuring system based on parameter analysis |
| 07/17/2013 | CN103207319A Harmonic wave measurement method of electricity signal of digital substation under non-synchronous sampling condition |
| 07/17/2013 | CN102445599B Frequency domain measuring method of array antenna directional pattern |
| 07/17/2013 | CN102331526B Method for acquiring parameters of electric power harmonic waves by using Hanniing window function continuous frequency spectrum interpolation |
| 07/17/2013 | CN102236048B Method for measuring phasor frequency of electric system |
| 07/17/2013 | CN102116811B Harmonic source judgment method in double bus transmission and electric energy quality monitoring system |
| 07/17/2013 | CN101419252B Modulation signature trigger |
| 07/16/2013 | US8489351 System and method for frequency measurement based on quadratic forms |
| 07/16/2013 | US8489350 Frequency domain bitmap triggering using color, density and correlation based triggers |
| 07/16/2013 | US8487608 System for measuring high-frequency signals with standardized power-supply and data interface |
| 07/16/2013 | US8487607 Method and device for digital triggering of a measurement signal having a superimposed noise signal |
| 07/11/2013 | WO2013063187A3 Shielding integrity testing for cable drop |
| 07/10/2013 | CN203054087U Dual harmonic analyzer |
| 07/10/2013 | CN203054086U Portable high-voltage transmission line harmonic wave detector |
| 07/10/2013 | CN203054085U Voltage frequency measuring device of high-voltage frequency converter |
| 07/10/2013 | CN203054077U Multichannel power analyzer |
| 07/10/2013 | CN103201639A System frequency response test using continuous sweep frequencies |
| 07/10/2013 | CN103197143A Harmonic and inter-harmonic detection method based on Hanning-window FFT algorithm and traversal filtering |
| 07/10/2013 | CN103197142A Method for simultaneously acquiring unknown frequency continuous analog signal and burst digital signal |
| 07/10/2013 | CN103197141A Method of measuring electrical power system signal frequency and harmonic wave parameters |
| 07/10/2013 | CN103197140A Method for extracting systematic frequency fluctuation signals |
| 07/10/2013 | CN103197139A Clock frequency test method and clock frequency test circuit |
| 07/10/2013 | CN102508022B Method for detecting power grid frequency by using optimal multiplier Newton algorithm |
| 07/10/2013 | CN102288819B FPGA (field programmable gate array)-based power harmonic analyzer |
| 07/10/2013 | CN102156639B Method for realizing embedded spectrum-analyzer display interface based on Java |
| 07/10/2013 | CN102004182B System and implementation method for monitoring grounding current of transformer core on line |
| 07/04/2013 | DE102005017833B4 Verfahren zur Ermittlung von Signalabschnitten Procedure for the determination of signal portions |
| 07/03/2013 | CN203037740U 31 harmonic meter realized by and based on DSP chip |
| 07/03/2013 | CN203037739U Accurate acquisition device of power grid frequency in audio forensics |
| 07/03/2013 | CN103185837A Method for measuring frequency of power system |
| 07/03/2013 | CN103185836A Measuring method for output frequency of frequency converter of variable frequency fan under different working conditions |
| 07/03/2013 | CN102323480B Electric energy quality analyzing method based on Hilbert-Huang transform |
| 07/03/2013 | CN102004186B High-accuracy sinusoidal signal measuring method for removing frequency spectrum leakage |
| 07/03/2013 | CN101793921B Noise measurement system in power stabilization network, variable filter and method for measuring noise in power stabilization network |
| 06/27/2013 | US20130162241 Detecting malicious hardware by measuring radio frequency emissions |