| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 02/26/2009 | US20090055112 Sensing apparatus |
| 02/26/2009 | US20090051445 Loosely-coupled oscillator |
| 02/26/2009 | US20090051347 High frequency delay circuit and test apparatus |
| 02/25/2009 | EP2027476A1 System for extraction and analysis of significant radioelectric signals |
| 02/25/2009 | CN100464191C Microelectronic machinery microwave frequency detector and its preparation method |
| 02/24/2009 | US7495519 System and method for monitoring reliability of a digital system |
| 02/24/2009 | US7495429 Apparatus and method for test, characterization, and calibration of microprocessor-based and digital signal processor-based integrated circuit digital delay lines |
| 02/19/2009 | US20090045881 Method And Apparatus For Calibrating A Voltage Controlled Oscillator By Varying Voltage Applied To Power Supply Input |
| 02/19/2009 | US20090045798 Synchronization of Spectrum Analyzer Frequency Sweep and External Switch |
| 02/18/2009 | EP1450170B1 Phase detector capable of detecting an accumulated value of phase displacement at a high speed and frequency stability measurement apparatus for arbitrary nominal frequency using the same |
| 02/18/2009 | CN101369004A Micro-phase shift fast transformation device used for excitation system frequency spectrum analysis |
| 02/18/2009 | CN101368992A Test system and method of video signal generator |
| 02/18/2009 | CN101368987A Power system mesomeric state harmonic wave and/or inter-harmonic wave measuring method |
| 02/17/2009 | US7493226 Method and construct for enabling programmable, integrated system margin testing |
| 02/17/2009 | US7492144 Preventing false locks in a system that communicates with an implanted wireless sensor |
| 02/12/2009 | WO2009019943A1 Measuring device and program |
| 02/12/2009 | US20090042528 Millimeter-wave phase-locked loop with injection-locked frequency divider using quarter-wavelength transmission line and method of calibration |
| 02/10/2009 | US7489204 Method and structure for chip-level testing of wire delay independent of silicon delay |
| 02/05/2009 | WO2009017238A1 Analog to digital conversion system |
| 02/05/2009 | WO2009016334A1 Method and apparatus for measuring breathing rate |
| 02/05/2009 | WO2008089341A3 System for fault determinations for high frequency electronic circuits |
| 02/05/2009 | DE102007037060A1 Analysis of alternating current frequency in a mains power supply, where the voltage signal has a high level of harmonics, computes two phases by discrete Fourier transformation |
| 02/04/2009 | CN201191306Y High precision electrical energy meter adopting frequency tracking sampling circuit |
| 02/04/2009 | CN100458453C Device and method for adjusting amplitude characteristic |
| 02/03/2009 | US7486067 Real-time device characterization and analysis |
| 01/29/2009 | US20090030629 Non-linear frequency and phase measurement scheme |
| 01/29/2009 | US20090030628 Signal analyser |
| 01/29/2009 | US20090027038 Systems And Methods That Detect Changes In Incident Optical Radiation |
| 01/28/2009 | CN100456039C CW pulse narrow band tracking filter and its tracking filter method |
| 01/27/2009 | US7483800 Peak detection and clutter reduction for a microwave sensor |
| 01/27/2009 | US7483799 Method and apparatus for sampling a power supply current of an integrated circuit, and storage medium onto which is recorded a control program therefor |
| 01/27/2009 | US7482888 Fast startup resonant element oscillator |
| 01/22/2009 | WO2009012342A2 Apparatus and methods of defining spectral regions of interest for signal analysis |
| 01/22/2009 | WO2007101178A3 Reference-less clock circuit |
| 01/22/2009 | US20090021282 High-frequency signal detector |
| 01/22/2009 | US20090021238 Optical device and method of controlling the same |
| 01/21/2009 | EP2017643A1 Method for optimising radioelectric signal measurements |
| 01/21/2009 | CN101349712A Apparatus for detecting thz signal frequency spectrum by superconduction josephson junction |
| 01/21/2009 | CN100454027C Frequency sensor and semiconductor device |
| 01/21/2009 | CN100454026C Cycle sampling method in quality of power supply in electrical network |
| 01/15/2009 | WO2009009777A1 Spectrum sensing function for cognitive radio applications |
| 01/15/2009 | US20090015339 Apparatus, method and computer program product for tracking information in an electric grid |
| 01/15/2009 | US20090015267 System and Method for Distortion Analysis |
| 01/15/2009 | US20090015238 Integrated Spectrum Analyzer Circuits and Methods for Providing On-Chip Diagnostics |
| 01/15/2009 | US20090015237 Classification technique for powered devices using selective frequency filtering |
| 01/15/2009 | DE102008023650A1 For analog differentiation of pulsed high frequency signals with lower pulse frequencies, divides the signals into a path to study only positive flanks and a path only for negative flanks |
| 01/15/2009 | DE102007047138A1 Power density spectrum measurements uses two Fourier transformation signals for computation of a value using a number of averages |
| 01/15/2009 | DE102007029999B3 Low frequency wobble generator consists of saw-tooth generator linked to analogue-digital convertor and relay |
| 01/14/2009 | EP2015083A1 Method and device for optimising the measuring time for noise or spectrum analysers using cross correlation methods |
| 01/14/2009 | CN201181316Y Ultra-low power consumption full-decompression measuring apparatus |
| 01/14/2009 | CN201181315Y Single-phase anti-electricity theft electric energy meter |
| 01/14/2009 | CN101344556A Method for enlarging effective dynamic range in electromagnetic compatibility test |
| 01/14/2009 | CN100451667C Photoelectric heterodyne detection circuit |
| 01/14/2009 | CN100451666C Improved method and apparatus for measuring stability of frequency of time domain signal |
| 01/14/2009 | CN100451662C Polar coordinate converting process for estimating signal background |
| 01/08/2009 | US20090009154 Wide-band antenna coupled spectrometer using cmos transistor |
| 01/07/2009 | EP2012558A2 Method and device for determining a spatial-acoustic impulse answer in the time domain |
| 01/07/2009 | CN101340325A Method and apparatus for detecting critical parameters of multi-sub-card system |
| 01/07/2009 | CN101339211A Frequency measuring input circuit of programmable control computer and frequency measuring method |
| 01/06/2009 | US7474973 Apparatus and method for detecting and analyzing spectral components in predetermined frequency bands within a signal, frequency filter, and related computer-readable media |
| 01/06/2009 | US7474972 Bandwidth multiplication for a test and measurement instrument using non-periodic functions for mixing |
| 01/06/2009 | US7474160 Systems and methods for calibrating a filter |
| 01/06/2009 | CA2213191C Process and machine for signal waveform analysis |
| 01/01/2009 | US20090006016 System and method for detecting a weak signal in a noisy environment |
| 01/01/2009 | US20090002081 Measurement apparatus for improving performance of standard cell library |
| 01/01/2009 | US20090001996 Systems and methods to evaluate permanent magnet motors |
| 12/31/2008 | WO2008072091A3 Signal analyzers and frequency domain data production methods |
| 12/31/2008 | CN201173966Y Amorphous alloy weak magnetic field sensor |
| 12/31/2008 | CN201173950Y Coupler for checking passive RFID intelligent electronic label resonance frequency |
| 12/31/2008 | CN101334431A Electric network harmonic frequency spectrum interpolation correction analytical method |
| 12/30/2008 | US7471116 Dynamic constant folding of a circuit |
| 12/30/2008 | CA2220053C Method and apparatus for detecting arcing in ac power systems by monitoring high frequency noise |
| 12/25/2008 | US20080319692 Transducer health diagnostics for structural health monitoring (shm) systems |
| 12/24/2008 | EP2005202A2 Systems and methods for performing automatic real-time harmonics analyses for use in real-time power analytics of an electrical power distribution system |
| 12/24/2008 | CN101330213A Display apparatus for active electric power filter |
| 12/24/2008 | CN101329374A Computation method of differential filter weighting period small amplitude value |
| 12/24/2008 | CN100446047C The circuit device of the power grid harmonious radio detector and its working method |
| 12/23/2008 | US7468509 Electrical interconnection structure for diverse signals |
| 12/18/2008 | WO2008152466A2 Insulation fault detection device |
| 12/17/2008 | EP2002269A2 System and method for voltage noise and jitter measurement using time-resolved emission |
| 12/17/2008 | CN201166916Y Intelligent remote integration monitoring system for a power equipment |
| 12/17/2008 | CN201166687Y Harmonic meter |
| 12/16/2008 | US7467053 Three-dimensional fourier transform processing method for shared memory scalar parallel computer |
| 12/16/2008 | US7466141 Phase measurement device, method, program, and recording medium |
| 12/16/2008 | US7466120 Communicating with an implanted wireless sensor |
| 12/11/2008 | WO2008149100A1 Determination of sine wave period |
| 12/11/2008 | US20080303508 Apparatus and Method for Estimating Carrier Frequency Offset in Communication Terminal, and Communication Terminal for Performing the Method |
| 12/11/2008 | DE10049525B4 Vorrichtung und Verfahren zur Berechnung eines Korrelationswertes entsprechend einem Frequenzfehler und Speichermedium mit einem gespeicherten Korrelationswert-Berechnungsprogramm Device and method for calculating a correlation value corresponding to a frequency error and a storage medium having stored correlation value calculation program |
| 12/10/2008 | EP2000810A1 Determination of sine wave period |
| 12/10/2008 | CN201163290Y Vehicle electric signal test device |
| 12/04/2008 | WO2008146790A1 Measuring apparatus and program |
| 12/04/2008 | US20080298535 Circuit structure for timer counter and electrical device using the same |
| 12/03/2008 | CN201160288Y Mobile terminal for oscillography |
| 12/03/2008 | CN101315396A Signal frequency component energy variation measuring method based on wavelet transformation factor summation |
| 12/02/2008 | US7460967 Selectable navigation to automatically discovered events within the acquisition record of a digital sampling oscilloscope |
| 12/02/2008 | US7459915 Electric circuit and test apparatus for outputting a recovered clock input signal |
| 12/02/2008 | US7459899 Inductively-coupled RF power source |
| 12/02/2008 | US7459898 System and apparatus for detecting and analyzing a frequency spectrum |
| 11/27/2008 | US20080290904 Frequency Monitor |
| 11/26/2008 | EP1706775B1 System and method for optimizing character marking performance |