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)
08/2010
08/18/2010CN201555893U Distribution type alternating current sampling device
08/18/2010CN101809453A Analog to digital conversion system
08/18/2010CN101806842A Power grid quality field recorder
08/18/2010CN101806835A Interharmonics measuring meter based on envelope decomposition
08/18/2010CN101806834A Kalman filter-based signal real-time time-frequency spectrometer
08/18/2010CN101806833A Multi-channel frequency response analysis system and method thereof
08/18/2010CN101806832A Measuring method for frequencies of low-frequency signals
08/12/2010US20100204939 Time qualified frequency mask trigger
08/12/2010US20100204938 Amplitude discrimination using the frequency mask trigger
08/11/2010CN201550088U Abnormal clock signal detection circuit
08/11/2010CN201549932U Electric parameter monitoring system based on GPRS network
08/11/2010CN201548656U Anti-jamming device for testing chips simultaneously
08/11/2010CN201548635U Monitoring device for pollution source of power quality
08/11/2010CN201548618U Stochastic resonance noise filtering and weak periodic signal detecting circuit
08/11/2010CN201548615U Distribution line network theoretical line loss real-time statistical analysis system
08/11/2010CN201548607U Resonance overvoltage analyzing system of transformer substation
08/11/2010CN101799494A Soft separation method of conducted electromagnetic interference noise based on blind signal processing technology
08/11/2010CN101271133B Detection circuit and its method for maximum operation frequency of pulse frequency modulation
08/10/2010US7772928 Arrangement for phase synchronization according to the master/slave principle
08/05/2010WO2010087799A1 Method and system for determining a spectral vector from measured electromagnetic-radiation intensities
08/05/2010US20100194400 Circuit Arrangement With A Test Circuit And A Reference Circuit And Corresponding Method
08/05/2010DE102010000953A1 System und Verfahren zum Testen einer Leistungsversorgung System and method for testing a power supply
08/05/2010DE102009013617A1 Method for signal or spectral adapted selection of signal or spectral characteristics of detected signal, involves selecting signal characteristics of detected signals in signal section based on two events
08/05/2010DE102005017833A1 Method for detecting signal section in signal entity, involves detecting spectral value as component of signal section or component of noise, and associating measured level value or noise level value with spectral value
08/04/2010CN201541114U Centralized electric energy management system
08/04/2010CN201540366U Three-phase harmonic standard calibration and verification device
08/04/2010CN201540350U Hyper-high-frequency signal receiving device for detecting local discharge
08/04/2010CN201540349U Ultra-high frequency signal sensor for partial discharge detection
08/04/2010CN201540331U Multi-passage high-precision synchronous frequency-measuring device
08/04/2010CN1793988B Periodic electrical signal frequency monitoring systems and methods
08/04/2010CN101793921A Noise measurement system in power stabilization network, variable filter and method for measuring noise in power stabilization network
08/04/2010CN101793920A Compact transient microwave frequency photon measurement system
08/03/2010US7769553 Method for compensating electromagnetic data
08/03/2010US7768276 Systems and methods for identifying problems with PZT elements of micro-actuators
08/03/2010US7768252 Systems and methods for determining sensing thresholds of a multi-resolution spectrum sensing (MRSS) technique for cognitive radio (CR) systems
07/2010
07/29/2010US20100188071 Systems and methods for detecting resonance on a direct current voltage bus
07/29/2010DE102009005774A1 Input device for entering parameter value for operation of electronic device, has detection devices connected with evaluation device for production of parameter value based on rotations detected by detection devices
07/28/2010CN201535801U Harmonic wave monitoring system of electrical network based on ARM9
07/28/2010CN101788606A Systems and methods for detecting resonance on a direct current voltage bus
07/28/2010CN101788605A Wireless-receiving system for detecting microelectronic mechanical microwave frequency and preparation method thereof
07/28/2010CN101788604A Electric power and electric quantity measuring method based on frequency domain analysis and sequence component analysis
07/27/2010US7765075 Method and device for spectral analysis in several frequency bands with different frequency resolution
07/27/2010US7764133 Time based predictive algorithm system for a crystal oscillator
07/22/2010WO2010083152A1 High frequency analysis of a device under test
07/22/2010DE102009037241A1 Processing unit e.g. programmable logic controller, for e.g. power switch of energy distributor, has electric circuit in which spectral portion of fundamental frequency of measurement variable is calucated by Goertzel algorithm
07/21/2010CN201532418U System of digital frequency meter based on EDA technology
07/21/2010CN101782608A Radio frequency identification device (RFID) label response frequency standard test system and method
07/21/2010CN101782607A Frequency-conversion harmonic measuring device of electrical power system
07/20/2010US7759926 Dynamic phase offset measurement
07/20/2010US7759925 Signal analyzer and method for signal analysis
07/15/2010US20100176790 Testing Method and Device for a Wireless Receiver
07/14/2010CN101777345A Design method of porous sound absorption structure material for sound absorption
07/14/2010CN101246189B Logarithm field analog wavelet converting circuit for electric power harmonic detection
07/13/2010US7756516 High-frequency measuring system having spatially separated high-frequency modules
07/08/2010WO2010077426A1 Methods for determining the frequency or period of a signal
07/07/2010CN201522549U Portable device for online diagnosing motor fault
07/07/2010CN201522528U Mid-frequency measuring box for RFID coil antenna
07/07/2010CN201522522U Power quality monitoring device based on DSP and PCI bus technology
07/07/2010CN101770587A System and method for negative testing of anti-collision capacity of RFID reader
07/07/2010CN101769956A Intelligent monitor system
07/06/2010US7751657 Inclinometer system
07/06/2010US7751470 Time correlation of signal power to distortion characteristics
07/06/2010US7750684 Power-on detection circuit for detecting minimum operational frequency
07/06/2010US7750629 Measuring electric and magnetic field
07/06/2010US7750619 Method and apparatus for measuring the frequency of a received signal
07/06/2010US7750618 System and method for testing a clock circuit
07/01/2010US20100164475 Device and method for measuring the frequency of a signal coded modulated carrier signal
07/01/2010US20100163757 Pulse Modifier with Adjustable Etendue
06/2010
06/30/2010CN201518049U Distribution transformer monitoring metering terminal
06/30/2010CN201518048U T-Hz frequency spectrograph based on T-hertzian wave parameter process
06/30/2010CN101764561A Simulation circuit of frequency of wind power generation power network and method thereof
06/30/2010CN101762758A System for monitoring and orientating electric power quality pollution source in electric network
06/30/2010CN101762746A Cyclostationary demodulation method of complex gear transmission chain current signal based on entropy optimization
06/30/2010CN101762745A Time-based phase-shifting method and apparatus
06/30/2010CN101762741A Monitoring and orientation system of pollution sources of electrical energy quality
06/30/2010CN101251556B Sinusoidal signal four parameters testing method and virtual apparatus signal detection device
06/29/2010US7747398 Systems, methods and devices for generating pulses
06/29/2010US7746183 Measurement apparatus for improving performance of standard cell library
06/29/2010US7746182 Systems and methods for voltage controlled oscillator calibration
06/29/2010US7746181 Circuit and method for extending the usable frequency range of a phase locked loop (PLL)
06/29/2010US7746052 Apparatus for extending the bandwidth of a spectrum analyzer
06/24/2010WO2010069938A1 Wideband digital receiver comprising a phase jump detection mechanism
06/24/2010WO2010069683A1 Wideband digital receiver comprising a signal detection mechanism
06/24/2010WO2010069414A1 Display of spectra
06/24/2010US20100161263 Independent frequency measurement and tracking
06/24/2010US20100156438 Spectrum analyzers with dynamic range indicator and methods of use
06/24/2010US20100156391 Measuring device
06/24/2010DE102008062696A1 Verfahren zur Messdatenverarbeitung und Messgerät Method for data processing and instrument
06/24/2010DE102008062695A1 Verfahren und Vorrichtung für eine digitale Anzeige eines Messgeräts Method and apparatus for a digital display of a measuring instrument
06/24/2010CA2676893A1 Independent frequency measurement and tracking
06/23/2010EP2199808A1 Method and device for a digital display on a measuring device
06/23/2010CN201514444U High-voltage electric power monitoring device
06/23/2010CN101755218A Apparatus and methods of defining spectral regions of interest for signal analysis
06/23/2010CN101753227A Radio frequency (RF) testing system and method for testing RF of multiple mobile communication devices
06/23/2010CN101750562A Non-PMU measure point dynamic process estimation method based on flow equation sensitiveness analysis
06/23/2010CN101750561A Electrical energy quality monitoring and evaluating system
06/23/2010CN101750540A Method for detecting parasitic loop of transformer station direct current system
06/23/2010CN101441231B Harmonic electric energy metering error analytical apparatus
06/23/2010CN101408567B Large scale electric network low-frequency oscillation frequency division section detection method based on empirical mode decomposition
06/22/2010US7742887 Identifying process and temperature of silicon chips
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