Patents
Sitemap › G01 - Measuring; Testing › G01R - Measuring electric variables; Measuring magnetic variables › G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503)
06/2010
06/22/2010US7741848 Adaptive multichannel locator system for multiple proximity detection
06/22/2010US7741831 Frequency component measuring device
06/22/2010US7741830 Image cancellation in frequency converters for spectrum analysers
06/22/2010US7741829 Subsystems and methods for use in patch clamp systems
06/22/2010US7741828 Power disturbance detection circuit and method
06/17/2010US20100153045 Method, coupler and apparatus for measuring radiated power
06/17/2010US20100153044 Signal analyzer and method for producing date therefore
06/17/2010US20100148751 Noise measurement apparatus and test apparatus
06/16/2010EP1250606B1 Magnetic digital signal coupler monitor
06/16/2010CN201508592U High-voltage prepayment electric energy quality measuring remote monitoring device
06/16/2010CN201508387U Electric-energy monitoring device for computer room of internet data center
06/16/2010CN101741481A Antenna feeder system performance test method and device
06/16/2010CN101738553A Universal testing system of frequency transformer and current transformer
06/16/2010CN101738551A Method for intelligent analysis of transient power quality disturbance based on networking
06/16/2010CN101738548A Clock pulse detecting circuit and clock pulse supply device
06/15/2010US7737794 Phase locked loop with temperature and process compensation
06/15/2010US7737730 Method of detecting the frequency of an input clock signal of an integrated circuit and integrated circuit
06/10/2010US20100142626 Block distortion detection method, block distortion detection apparatus, block distortion removal method, and block distortion removal apparatus
06/10/2010US20100141269 Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
06/10/2010US20100141240 Methods for determining the frequency or period of a signal
06/10/2010US20100141239 Secum-Trahenz Method, Especially for a Network Analyzer
06/10/2010US20100141238 Miniature rf calibrator utilizing multiple power levels
06/10/2010DE112008001994T5 Messgerät und Programm Instrument and program
06/09/2010CN101727092A System and method for analyzing frequency spectrum
06/09/2010CN101726663A Method and system for monitoring user-side harmonic pollution
06/09/2010CN101726658A Single-channel time-sharing multiplexing sampling method and sampling circuit thereof
06/09/2010CN101726648A Neuron adaptive harmonic current detection circuit based on low pass filter
06/09/2010CN101290341B Hydroelectric units primary frequency modulation performance test method
06/02/2010EP2192415A1 Signal analysis method, signal analysis device, and signal analysis program
06/02/2010CN101718816A Fundamental wave and harmonic wave detection method based on four-item coefficient Nuttall window interpolation FFT
06/02/2010CN101718814A Method for measuring and calculating electrical quantities of safety and stability control device based on FPGA
06/02/2010CN101718809A System and method for acquiring power quality data
06/02/2010CN101718808A Intelligent virtual instrument and application method
06/02/2010CN101201365B System and method for measuring and analyzing voltage frequency
05/2010
05/27/2010US20100131243 Apparatus for Measuring Distortion Power Quality Index and Method of Operating the Apparatus
05/26/2010CN1302465B Adaptive sampling rate based on power system frequency
05/26/2010CN101713811A System for automatically testing parameters of quartz crystal oscillator
05/26/2010CN101713796A Vehicle-mounted microcomputer frequency measuring device
05/26/2010CN101713795A Method of digitalized measuring frequency in restriction of sampling rate
05/25/2010US7725277 Method and device for performing a frequency analysis of an AC voltage signal, in particular on a power grid
05/25/2010US7723949 Battery device
05/19/2010CN201477156U Intelligent higher harmonics test apparatus
05/19/2010CN201477155U Crystal oscillator frequency tester
05/19/2010CN201477145U Monitoring system for power quality
05/19/2010CN1975454B Electromagnetic coefficient tester for electromagnetic material and testing method thereof
05/19/2010CN101710156A Power utilization quality detection circuit and detection method thereof
05/19/2010CN101710155A Measuring system and method of work frequency of HEMT device of ultra-fast triode
05/19/2010CN101710154A Liquid surface wave detecting method and device based on scattering laser Doppler effect
05/19/2010CN101710153A Embedded electric energy meter with harmonic measurement function and measurement method thereof
05/18/2010US7720646 Signal processor and tracking method of signal search range
05/18/2010US7719862 Power factor correction by measurement and removal of overtones
05/15/2010CA2684446A1 Method of scanning, analyzing and identifying electromagnetic field sources
05/13/2010US20100122106 Serial bus clock frequency calibration system and method thereof
05/13/2010US20100121596 Methods and systems for frequency estimation for accelerometers
05/13/2010US20100117624 Network-distributed oscilloscope and method of operation thereof
05/12/2010CN201466441U Power supply device with wireless metering function
05/12/2010CN201464570U Test system of high-voltage converter
05/12/2010CN201464557U Intermediate frequency spectrum monitoring device
05/12/2010CN201464556U multi-vector harmonic analyzer
05/12/2010CN201464552U Electric energy meter counter
05/12/2010CN201464536U Ethernet type voltage monitoring instrument suitable for transformer substation
05/12/2010CN201464527U Casing of microcomputer frequency analysis device
05/12/2010CN201464526U Portable microcomputer frequency analysis device housing
05/12/2010CN101706532A Method and device for measuring harmonic impedance
05/12/2010CN101706527A Method for detecting arc faults based on time-frequency characteristics of high-frequency current component
05/11/2010US7715996 Method of estimating digital signal frequency
05/11/2010US7714670 Monitoring and compensating for real time local circuit speed in an integrated circuit
05/11/2010US7714572 Method of detecting characteristics of films using eddy current
05/11/2010US7714565 Methods and apparatus for testing delay locked loops and clock skew
05/11/2010US7714564 Gated sweep in spectrum analyzers
05/06/2010WO2010049686A1 Signal processing
05/06/2010US20100109787 Method and apparatus for oscillator stability verification
05/06/2010US20100109639 Frequency spectrum analysis system and method
05/06/2010DE102009050443A1 Identifizierungsgerät für determinierte Komponente, Identifizieren, Aufzeichnungsmedium, Prüfsystem und elektronische Vorrichtung Identification device for deterministic component identifying, recording medium, test system and electronic device
05/06/2010DE102008055647A1 Composite picture signal component detecting method, involves forming synthetic time signal from start values of sine components during cancellation of sine component, and determining number of iteration cycles based on abort criterion
05/06/2010DE102008043394A1 Verfahren zur Detektion von Peaküberlagerungen in einem diskreten Spektrum eines Ortungssignals A method for detecting peak overlays in a discrete spectrum of a locating signal
05/05/2010CN201449652U Electric device for alarming cyclic waves
05/05/2010CN1864073B Method for characterizing a sample by low-frequency spectra
05/05/2010CN101701988A Integrated portable multichannel phase coherent signal analyzer
05/05/2010CN101701986A System for pre-testing and diagnosing electro magnetic interference of electronic equipment and method thereof
05/05/2010CN101701985A Constant-frequency variable dot power grid harmonic wave detection method and admeasuring apparatus thereof
05/05/2010CN101701984A Fundamental wave and harmonic wave detecting method based on three-coefficient Nuttall windowed interpolation FFT
05/05/2010CN101701983A Power system interharmonic wave detection method based on MUSIC spectrum estimation and HBF neural network
05/05/2010CN101701982A Method for detecting harmonic waves of electric system based on window and interpolated FFT
05/05/2010CN101701981A Frequency shift parameter measuring system of frequency shift track circuit and measuring method thereof
05/04/2010US7711510 Method of crossover region phase correction when summing signals in multiple frequency bands
05/04/2010US7710103 Preventing false locks in a system that communicates with an implanted wireless sensor
05/04/2010US7710102 Clock test apparatus and method for semiconductor integrated circuit
05/04/2010CA2502980C Noise spectrum estimation method and apparatus
04/2010
04/29/2010WO2010047940A1 System and method for map-based radio spectrum allocation search
04/29/2010US20100106442 Generation of constant envelope or nearly-constant envelope signals satisfying a given fourier transform magnitude
04/29/2010US20100102890 Variable-Loop-Path Ring Oscillator Test Circuit and Systems and Methods Utilizing Same
04/29/2010US20100102811 NMR, MRI, and Spectroscopic MRI in Inhomogeneous Fields
04/29/2010DE102008043203A1 Device for detecting phase frequency of phase signal of multi-phase signal of generator utilized for providing energy to vehicle, has adaptation mechanism adapting cut-off frequency of filter mechanism depending on detected frequency
04/29/2010DE102005028881B4 Fehlerstromanalysator zur Erfassung eines Fehlerstroms und Einrichtung mit Fehlerstromerfassungsfunktion Fehlerstromanalysator for detecting a fault current and fault current detection device with function
04/28/2010CN201444178U Intelligent integrated electronic tester
04/28/2010CN201444176U Harmonicwave monitoring device for wind power generation
04/28/2010CN201444175U Test head of tuning fork crystal frequency modulation machine
04/27/2010US7706911 Yield estimation method for LSI
04/27/2010US7706450 Block distortion detection method, block distortion detection apparatus, block distortion removal method, and block distortion removal apparatus
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