| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 05/06/2009 | CN201233423Y Electric network voltage detection device |
| 05/06/2009 | CN101424714A Electric power frequency measurement method based on big dipper satellite and apparatus |
| 05/06/2009 | CN100485405C Circuit for detecting voltage and frequency of input power supply |
| 05/05/2009 | US7528632 Half bin linear frequency discriminator |
| 04/30/2009 | US20090108879 Programmable sensitivity frequency coincidence detection circuit and method |
| 04/30/2009 | US20090108878 High-frequency clock detection circuit |
| 04/30/2009 | US20090108858 Methods and systems for calibrating rc circuits |
| 04/30/2009 | DE10245872B4 Vorrichtung und Verfahren zur Ermittlung der Ausgangsfrequenz eines Stromrichters Apparatus and method for determining the output frequency of the converter |
| 04/29/2009 | EP2052266A2 Device and method for measuring the frequency of a signal coded modulated carrier signal |
| 04/29/2009 | CN201229368Y Multipath fast switching circuit for testing Crystal Oscillator by network analyser |
| 04/29/2009 | CN201229367Y Low noise deviation frequency generator |
| 04/29/2009 | CN101420226A Full digital phase locking loop |
| 04/29/2009 | CN101420200A General speed controller for electricity generator |
| 04/29/2009 | CN101419255A Detection circuit for duty ratio of switching power supply, detection method and applications |
| 04/29/2009 | CN101419252A Modulation signature trigger |
| 04/29/2009 | CN101419090A Array noise signal focussing method in measurement of target noise |
| 04/29/2009 | CN100483139C Self-adapting random resonant weak signal detection method |
| 04/29/2009 | CN100483138C Method and system for detecting and analyzing waveform in monocycle |
| 04/23/2009 | WO2009052297A2 Signal discriminator, high-impedance conductor identification apparatus, and method therefor |
| 04/23/2009 | WO2009050408A2 Method for qualifying the stability of a controlled system |
| 04/23/2009 | WO2007038143A3 Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment |
| 04/23/2009 | US20090105980 Plasma processing apparatus and method for detecting status of said apparatus |
| 04/23/2009 | US20090102452 Circuit and method for on-chip jitter measurement |
| 04/23/2009 | DE102007050051A1 Measuring device for e.g. determining field strength or power flux density of electromagnetic field, has measuring computer, microcontroller or digital signal processor formed as controller, where sum correction factor is executed |
| 04/22/2009 | CN201224416Y Apparatus for measuring railway frequency shift signal |
| 04/22/2009 | CN100482011C System and method for sensing light emitted from multiple light sources |
| 04/21/2009 | US7522285 Method for determining the frequency response of an electrooptical component |
| 04/21/2009 | CA2418476C Procedure for the identification of the source of a signal |
| 04/16/2009 | WO2009048970A1 Power angle monitor |
| 04/16/2009 | US20090096466 Passive Intermodulation Test Apparatus |
| 04/16/2009 | US20090096439 Built-in jitter measurement circuit |
| 04/16/2009 | CA2702205A1 Power angle monitor |
| 04/15/2009 | EP2048509A1 Modulation signature trigger |
| 04/15/2009 | CN201222082Y Frequency domain active orthogonal vector type detection system |
| 04/15/2009 | CN101408594A Device suitable for monitoring direct-current power supply ripple coefficient |
| 04/15/2009 | CN101408586A On-line low-frequency oscillation detection and node coherence grouping method based on experience modal decomposition |
| 04/15/2009 | CN101408577A Analysis method of low-frequency oscillation node contribution factor based on wide field measuring information |
| 04/15/2009 | CN101408567A Large scale electric network low-frequency oscillation frequency division section detection method based on empirical mode decomposition |
| 04/14/2009 | US7519513 High bandwidth real time oscilloscope |
| 04/14/2009 | US7519491 Data processing method for spectrum analyzer |
| 04/14/2009 | US7519113 Noise detection device |
| 04/14/2009 | US7518376 Electric field probe |
| 04/09/2009 | US20090093986 Method and Apparatus for Elimination of Spurious Response due to Mixer Feed-Through |
| 04/09/2009 | US20090093980 Real time sd-oct with distributed acquisition and processing |
| 04/08/2009 | CN201218822Y Electric energy quality on-line monitoring device |
| 04/08/2009 | CN101404546A Frequency spectrum occupancy rate measuring method based on signal moment characteristics |
| 04/08/2009 | CN101403774A Harmonic wave analysis method based on non-synchronous sampling |
| 04/08/2009 | CN101403771A Full-open distribution type electric energy mass parameter monitoring system |
| 04/07/2009 | US7516379 Circuit and method for comparing circuit performance between functional and AC scan testing in an integrated circuit (IC) |
| 04/07/2009 | US7516031 Apparatus and method for correcting for aberrations |
| 04/02/2009 | WO2008133679A8 Robust signal detection using correntropy |
| 04/02/2009 | WO2006033676A3 Digital broadband frequency measurement |
| 04/02/2009 | DE102008016874A1 Spectrum inversion detecting apparatus for digital transmission technique e.g. digital audio broadcasting in digital TV, has correlator calculating non-inverted correlation value and inverted correlation value |
| 04/02/2009 | DE102007046318A1 Abtastverfahren Scanning |
| 04/01/2009 | CN101401004A Reducing search time and increasing search accuracy during interrogation of resonant devices |
| 04/01/2009 | CN101398452A Computation method of dynamic electric energy index of quality based on 100kHz frequency |
| 04/01/2009 | CN100474190C Pulse output function for programmable logic controller |
| 03/31/2009 | US7512511 Improvised explosive device countermeasures |
| 03/26/2009 | WO2009038056A1 Signal analysis method, signal analysis device, and signal analysis program |
| 03/26/2009 | WO2009003450A3 Method for the system characterization of a signal conditioning component and measurement device therefor |
| 03/26/2009 | US20090082982 Trigger event detection apparatus and method therefor |
| 03/26/2009 | US20090082981 Method and apparatus for measurement of amplitude of periodic signal and method and apparatus for test of magnetic head |
| 03/26/2009 | US20090079507 System for compensation of VCO non-linearity |
| 03/25/2009 | EP2040052A1 Method and device for complex analysis of optical spectra |
| 03/25/2009 | CN101393240A Electric network harmonic on-line supervisory circuit based on virtual instrument and working method thereof |
| 03/25/2009 | CN101393234A Waveform auto-measuring system and method |
| 03/24/2009 | US7508218 Apparatus and method for measuring loop insertion loss single-endedly |
| 03/19/2009 | WO2009035752A1 Method of non-uniform doppler compensation for wideband orthogonal frequency division multiplexed signals |
| 03/19/2009 | US20090076752 Free-state modal frequency response testing |
| 03/19/2009 | US20090072811 Pulse Measurement Apparatus and Method |
| 03/19/2009 | US20090072126 Light source frequency detection circuit for image sensor |
| 03/19/2009 | DE102007043927A1 Time-continuous sinusoidal signal asynchronous sampling method for digital signal processing application, involves determining approximation frequency for signal frequency depending on evaluation of Fourier spectrums of sampling values |
| 03/18/2009 | CN101387664A Microelectronic machinery microwave frequency detector and method for making same |
| 03/18/2009 | CN101387663A Ultra low power consumption full-decompression measuring set and measurement method |
| 03/18/2009 | CN101387662A Watthour meter of three phase electronic electric energy meter and measurement method |
| 03/18/2009 | CN101387661A Single-phase electric energy meter capable of avoiding fraudulent use of electricity and measuring calculation method capable of avoiding fraudulent use of electricity |
| 03/18/2009 | CN101387659A Transformer harmonic current analyzer |
| 03/18/2009 | CN100470267C Excess optical carrier grating |
| 03/17/2009 | US7505858 Method for analyzing tone quality of exhaust sound |
| 03/17/2009 | US7504896 Methods and apparatus for inline measurement of switching delay history effects in PD-SOI technology |
| 03/17/2009 | US7504865 Frequency sensor and semiconductor device |
| 03/17/2009 | US7504818 Rotation phase angle measuring device, and control-protecting devices of electric power system using the same |
| 03/12/2009 | US20090066578 System and method for cumulant-based geolocation of cooperative and non-cooperative rf transmitters |
| 03/12/2009 | US20090066426 Quartz crystal device including monitor electrode |
| 03/12/2009 | DE102007042266A1 Method for rejection of ambient interference signal during measurement of interference emissions of electric and electronic devices, involves digitalizing signal of antenna through analog to digital converter |
| 03/11/2009 | EP2032996A2 Method for instantaneously determining rates of distortion of signals on an ac electrical network, and associated device |
| 03/11/2009 | CN101382593A Method for detecting weak low frequency signal form unknown strong frequency conversion signal |
| 03/11/2009 | CN101382588A Three phase harmonic standard electric energy meter |
| 03/10/2009 | US7501807 Spectrum analyzer having a resolution filter that can be adjusted via phase-variation parameter |
| 03/05/2009 | WO2009028763A1 Apparatus for measuring distortion power quality index and method of operating the apparatus |
| 03/05/2009 | US20090063073 Method for ascertaining a mains frequency in a voltage signal, and mains analyzer |
| 03/05/2009 | US20090058468 Method of Detecting the Frequency of an Input Clock Signal of an Integrated Circuit and Integrated Circuit |
| 03/05/2009 | DE102008039195A1 Verfahren zum Erfassen der Frequenz eines Eingangstaktsignals einer integrierten Schaltung und integrierte Schaltung A method for detecting the frequency of an input clock signal, an integrated circuit and integrated circuit |
| 03/04/2009 | EP1836600A4 Modelling a phenomenon that has spectral data |
| 03/04/2009 | CN201203656Y Electronic soft label detection device |
| 03/04/2009 | CN201203655Y Electronic soft label detection sensor |
| 03/04/2009 | CN101377909A Timing controllers and driving ability control methods |
| 03/04/2009 | CN100465651C A resonant sensor control system with an intermittent operation mode |
| 03/03/2009 | US7498891 Method for calibration of an oscillator for a microcontroller chip operation |
| 03/03/2009 | US7498799 Communicating with an implanted wireless sensor |