| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 07/23/2009 | US20090187363 Method for optimization of a frequency spectrum |
| 07/23/2009 | US20090184772 Aging compensation method and control module for an oscillator circuit device |
| 07/22/2009 | EP2079990A1 Method and device for checking a sensor signal |
| 07/22/2009 | CN201278002Y Tuning fork crystal test apparatus |
| 07/22/2009 | CN101487860A Frequency multiplier circuit suitable for scanning force microscope frequency monitoring and its frequency measurement circuit |
| 07/22/2009 | CN100516898C High precision clock detecting method and testing apparatus |
| 07/16/2009 | WO2009052297A3 Signal discriminator, high-impedance conductor identification apparatus, and method therefor |
| 07/16/2009 | WO2004044672A3 System and method for manufacturing wireless devices |
| 07/16/2009 | US20090182525 Explosive device countermeasures |
| 07/16/2009 | US20090179630 Gated sweep in spectrum analyzers |
| 07/15/2009 | CN201273923Y Distortion test apparatus based on comparison between a peak value and an effective value |
| 07/15/2009 | CN101484814A System for extraction and analysis of radio signals |
| 07/14/2009 | US7560997 Semiconductor integrated circuit device and test method therefor |
| 07/14/2009 | CA2450841C Method and device for determining sideband ratios of superconducting mixers using comb generator |
| 07/09/2009 | US20090177423 Signal detection using delta spectrum entropy |
| 07/09/2009 | US20090173621 Method of magnetron sputtering and a method for determining a power modulation compensation function for a power supply applied to a magnetron sputtering source |
| 07/08/2009 | CN201269907Y Harmonic detector used between electrical power systems |
| 07/08/2009 | CN101479613A Method for instantaneously determining rates of distortion of signals on an AC electrical network, and associated device |
| 07/08/2009 | CN101479612A Frequency measuring instrument |
| 07/08/2009 | CN101479611A Methods and apparatus for sensing unconfinement in a plasma processing chamber |
| 07/07/2009 | US7558685 Frequency resolution using compression |
| 07/07/2009 | US7557560 Timing generator and test device |
| 07/02/2009 | WO2009081780A1 Frequency characteristics measuring device |
| 06/25/2009 | US20090164161 Device for measuring ac magnetization of materials and method for detecting bio-molecules |
| 06/25/2009 | US20090164160 Methods and systems for determining a received signal frequency |
| 06/25/2009 | US20090163246 Oscillator calibration |
| 06/25/2009 | US20090160561 Surface-mount type crystal oscillator |
| 06/25/2009 | US20090160430 HAND-HELD MICROWAVE SPECTRUM ANALYZER WITH OPERATION RANGE FROM 9 KHz TO OVER 20 GHz |
| 06/25/2009 | US20090160429 Frequency component measuring device |
| 06/25/2009 | US20090159819 Pulse Modifier, Lithographic Apparatus and Device Manufacturing Method |
| 06/24/2009 | EP2073027A1 Methods and systems for determining a received signal frequency |
| 06/24/2009 | CN101464480A Multi-point frequency source modulation field characteristics test method |
| 06/23/2009 | US7552018 Method for quickly quantifying the resistance of a thin film as a function of frequency |
| 06/23/2009 | US7550977 Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment |
| 06/18/2009 | WO2009073958A1 Method and system for estimating parameters of a multi-tone signal |
| 06/18/2009 | US20090157338 Measuring method and apparatus for potentiometric measuring probes |
| 06/18/2009 | US20090153132 Methods and apparatus for computing and using a spectral map for performing nonlinear calibration of a signal path |
| 06/17/2009 | EP2071341A2 Automatic generation of frequency domain mask |
| 06/17/2009 | EP2069806A2 Signal analyzers and frequency domain data production methods |
| 06/17/2009 | CN101458280A Method and device for detecting discrete time-domain signal frequency |
| 06/17/2009 | CN101458279A Frequency measurement method by beat method capable of enhancing precision |
| 06/17/2009 | CN101458278A Modulation domain analysis measuring set based on time scale phase shift and error compensation method thereof |
| 06/17/2009 | CN100501421C Fast frequency measuring system and method |
| 06/16/2009 | US7548125 Frequency calibration for a monolithic clock generator and timing/frequency reference |
| 06/16/2009 | US7548071 Reflectometry test system using a sliding pseudo-noise reference |
| 06/16/2009 | CA2464251C Method and apparatus for spectrom analysis |
| 06/11/2009 | US20090150102 Spectral Analysis with adaptive resolution |
| 06/11/2009 | US20090146744 System and method of calibrating real time clock utilizing average calibration |
| 06/10/2009 | EP2067046A2 Realtime spectrum trigger system on realtime oscilloscope |
| 06/10/2009 | DE102008037308A1 Pulse-modulated signal analyzing method for e.g. communication application, involves calculating frequencies of spectrum of modulated signal, and reconstructing signal by transformation of measured complex spectral lines in period |
| 06/10/2009 | CN101452019A Clocking frequency comparing unit and method |
| 06/10/2009 | CN100498349C Middle-frequency completely digitalized frequency spectrum |
| 06/09/2009 | US7546230 Electromagnetic response model with improved high frequency stability |
| 06/04/2009 | US20090144005 Method for ascertaining the harmonic components of an analog electrical signal at a fundamental frequency which changes over time |
| 06/04/2009 | US20090144004 Method and Device for Spectral Analysis in Several Frequency Bands with Different Frequency Resolution |
| 06/04/2009 | US20090140774 System and method for communicating data among chained circuits |
| 06/04/2009 | US20090140732 Low cost simplified spectrum analyzer for magnetic head/media tester |
| 06/04/2009 | DE10103822B4 Korrelationsfunktions-Messverfahren und -Vorrichtung Correlation function measuring method and apparatus |
| 06/03/2009 | CN201251601Y Weak low frequency instant vibration signal detection circuit based on frequency measurement |
| 06/03/2009 | CN101446605A Low-frequency oscillation monitoring method for power system |
| 06/02/2009 | US7542860 Method and device for detecting the location of a pulse-type mechanical effect on a system part |
| 05/28/2009 | US20090138222 S/N Ratio Measuring Method in Eddy Current Testing on Internal Surface of Pipe or Tube |
| 05/28/2009 | DE102007056605A1 Verfahren zum Ermitteln der Oberwellenanteile eines analogen elektrischen Signals mit sich zeitlich ändernder Grundfrequenz Method for determining the harmonic content of an analog electrical signal with time-varying fundamental frequency |
| 05/28/2009 | DE102005010498B4 Verfahren und Oszillator zur Erzeugung von Oszillationen Procedures and oscillator for generating oscillations |
| 05/27/2009 | CN101443666A Reference-less clock circuit |
| 05/27/2009 | CN101441233A Base wave and harmonic detecting method based on Kaiser window double-line spectrum insert value FFT |
| 05/27/2009 | CN101441232A Time base frequency real time calibration frequency measuring method and apparatus |
| 05/27/2009 | CN101441231A Harmonic electric energy metering error analytical apparatus |
| 05/27/2009 | CN100492871C Method for regulating frequency domain based nonlinear power system stabilizer parameter |
| 05/26/2009 | US7539582 Apparatus and method for detecting and analyzing spectral components in predetermined frequency bands within a signal, frequency filter, and related computer-readable media |
| 05/26/2009 | CA2352142C Method for diagnosing insulation degradation in underground cable |
| 05/21/2009 | US20090132207 Fast Low Frequency Jitter Rejection Methodology |
| 05/21/2009 | US20090132189 Method for determining plasma characteristics |
| 05/21/2009 | US20090128164 Phase frequency distortion measurement system |
| 05/21/2009 | US20090128123 Vector/signal analyzer equalization apparatus and method |
| 05/20/2009 | EP2060908A1 Passive intermodulation distortion measuring method and system |
| 05/20/2009 | DE112007001891T5 Wahrscheinlichkeitsdichtefunktions-Trennvorrichtung, Wahrscheinlichkeitsdichtefunktions-Trennverfahren, Programm, Prüfvorrichtung, Bitfehlerraten-Messvorrichtung, elektronische Vorrichtung und Jitterübertragungsfunktions-Messvorrichtung Probability density function separating device, probability density function separating method, program, test apparatus, bit error rate measuring apparatus, electronic apparatus and measuring apparatus Jitterübertragungsfunktions |
| 05/20/2009 | DE112007001890T5 Störungstrennvorrichtung, Störungstrennverfahren, Wahrscheinlichkeitsdichtefunktions-Trennvorrichtung, Wahrscheinlichkeitsdichtefunktions-Trennverfahren, Prüfvorrichtung, elektronische Vorrichtung, Programm und Aufzeichnungsmedium Disorder separator disorder separation processes, probability density function separating device, probability density function separating method, test device, electronic device, program and recording medium |
| 05/20/2009 | DE102007054307A1 Verfahren und Vorrichtung zum Durchführen einer Frequenzanalyse eines Wechselspannungssignals, insbesondere an einer Versorgungsnetzleitung Method and apparatus for performing a frequency analysis of an AC voltage signal, in particular to a power supply line |
| 05/20/2009 | DE102007054306A1 Verfahren zum Analysieren von Wechselspannungssignalen A method of analyzing AC voltage signals |
| 05/20/2009 | CN201242568Y Frequency-measurement input circuit for programmable control computer |
| 05/20/2009 | CN201242567Y Apparatus for measuring AC voltage parameter using generator residual pressure |
| 05/20/2009 | CN101437295A Method for detecting perception radio collaboration frequency spectrum based on SNR compare |
| 05/20/2009 | CN101435836A Frequency detector for measuring liquid electric conductivity by using Wien-bridge oscillating circuit |
| 05/20/2009 | CN100489544C Spectrogram mask trigger |
| 05/14/2009 | WO2009012342A3 Apparatus and methods of defining spectral regions of interest for signal analysis |
| 05/14/2009 | US20090125261 Method for analyzing ac voltage signals |
| 05/14/2009 | US20090125260 Method and device for performing a frequency analysis of an ac voltage signal, in particular on a power grid |
| 05/14/2009 | US20090125259 Apparatus and methods of defining spectral regions of interest for signal analysis |
| 05/14/2009 | US20090125258 Scannable virtual rail ring oscillator circuit and system for measuring variations in device characteristics |
| 05/14/2009 | US20090125255 Methods and apparatus for measuring voltage and voltage phase angle on bpl line |
| 05/14/2009 | DE102007031952A1 Niederfrequenzwobbelegenerator Niederfrequenzwobbelegenerator |
| 05/14/2009 | DE10196595B4 Digitalisierungsvorrichtung und Halbleiter-Prüfvorrichtung Digitization device and semiconductor test apparatus |
| 05/12/2009 | US7532040 Programmable sensitivity frequency coincidence detection circuit and method |
| 05/07/2009 | US20090119052 Integrated margin testing |
| 05/07/2009 | US20090115536 Programmable linear trimming method and system for phase locked loop circuit calibration |
| 05/07/2009 | US20090115397 Preventing False Locks in a System That Communicates With an Implanted Wireless Sensor |
| 05/07/2009 | US20090115396 Communicating with an Implanted Wireless Sensor |
| 05/07/2009 | DE19954182B4 Elektronischer Multimeter Electronic Multimeter |
| 05/06/2009 | CN201233427Y Multifunction electric energy meter |