| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 01/28/2010 | WO2009147474A3 Methods of calibrating a clock using multiple clock periods with a single counter and related devices and methods |
| 01/28/2010 | US20100019757 System and method for on-chip duty cycle measurement |
| 01/27/2010 | CN201392366Y Improved portable frequency spectrum analyzer |
| 01/27/2010 | CN100585701C Mixed sound separating device |
| 01/26/2010 | US7653514 High bandwidth oscilloscope for digitizing an analog signal having a bandwidth greater than the bandwidth of digitizing components of the oscilloscope |
| 01/26/2010 | US7653501 Apparatus for determining diameter of parabolic antenna and method therefor |
| 01/21/2010 | US20100013456 Arrangement for Detecting Resonance Frequency Shifts |
| 01/21/2010 | US20100013455 Rf circuit analysis |
| 01/21/2010 | US20100012874 Rotary Encoder Frequency Analysis |
| 01/20/2010 | EP1221041B1 Highly time resolved impedance spectroscopy |
| 01/20/2010 | CN201388065Y Quasi-synchronization device applying software and hardware frequency measuring and phase measuring combined technology |
| 01/20/2010 | CN201387450Y Digital-analog hybrid harmonic analyzer |
| 01/20/2010 | CN201387438Y Measuring device with electromagnetic shielding device |
| 01/20/2010 | CN101629977A Disconnection protection circuit for frequency sensor |
| 01/19/2010 | US7650248 Integrated circuit for in-system signal monitoring |
| 01/14/2010 | US20100010762 Frequency measurement apparatus |
| 01/14/2010 | US20100010761 Method and device for monitoring a system |
| 01/14/2010 | US20100007329 Device and method for the analysis of a measured signal transmitted via a multi-channel system |
| 01/13/2010 | CN201382975Y Phase noise tester |
| 01/13/2010 | CN201382974Y Power measurement device for variable-frequency power supply |
| 01/13/2010 | CN201382973Y Energy consumption monitoring system based on wireless sensor network |
| 01/12/2010 | US7645984 Apparatus and method for identifying peaks in liquid chromatography/mass spectrometry data and for forming spectra and chromatograms |
| 01/07/2010 | US20100001743 Apparatus and method to distinguish nominally identical objects through wave fingerprints Apparatus and method to distinguish nominally identical objects through wave fingerprints |
| 01/05/2010 | US7642864 Circuits and design structures for monitoring NBTI (negative bias temperature instability) effect and/or PBTI (positive bias temperature instability) effect |
| 01/05/2010 | US7642863 Systems and methods for PLL linearity measurement, PLL output duty cycle measurement and duty cycle correction |
| 12/31/2009 | US20090326845 Probability density function separating apparatus, probability density function separating method, noise separating apparatus, noise separating method, testing apparatus, testing method, calculating apparatus, calculating method, program, and recording medium |
| 12/31/2009 | US20090322311 Method and Apparatus for On-Chip Testing of High Speed Frequency Dividers |
| 12/30/2009 | WO2009124073A3 Acquiring phasors outside the frequency tracking range for power protective relays |
| 12/30/2009 | EP2137817A2 Application of signal advance amplification to analog waveform or signal detection, acquisition and processing |
| 12/30/2009 | CN101617235A Method and apparatus for implementing finite impulse response filters without the use of multipliers |
| 12/30/2009 | CN100575965C Method for measuring frequency of single-chip |
| 12/30/2009 | CN100575935C Method and apparatus of detecting low flow/cavitation of a centrifugal pump |
| 12/29/2009 | US7640139 Abnormality diagnosing system for mechanical equipment |
| 12/29/2009 | US7640123 Method and system for detecting bluetooth signals utilizing a wideband receiver |
| 12/24/2009 | US20090315999 Frequency component measuring device |
| 12/23/2009 | WO2009152540A1 Electric installation structure |
| 12/23/2009 | CN201368905Y Power quality monitoring and recording device of power system |
| 12/23/2009 | CN201368904Y Real-time dynamic monitoring and recording device of power system |
| 12/23/2009 | CN101609112A Node phase relation identification method of electric system based on wide area measurement noise signal |
| 12/23/2009 | CN100573165C Device for detecting passive RFID electronic label resonance frequency |
| 12/17/2009 | US20090312971 Apparatus and method for locating inferior parts in power distribution line equipment based on variation of radio frequency noise signal |
| 12/17/2009 | US20090310730 Frequency Detector and Phase Locked Loop Having the Same |
| 12/17/2009 | US20090309666 Dynamic calibration techniques for digitally controlled oscillator |
| 12/17/2009 | US20090309574 Device for counting oscillations of an oscillating temporal signal |
| 12/17/2009 | DE102008002270A1 Multispektraler Sensor Multispectral sensor |
| 12/16/2009 | EP2133702A1 Synchronous phasor measuring device and inter-bus phase angle difference measuring device employing it |
| 12/16/2009 | CN201365116Y Power capacitor protecting device |
| 12/16/2009 | CN201364361Y Variable-frequency harmonic measurement device for power system |
| 12/16/2009 | CN101603985A Method for measuring sine signal with high accuracy |
| 12/16/2009 | CN101603984A Real-time detection method for the digitalization of electrical signal frequency |
| 12/16/2009 | CN100570391C Permanent-magnetism synchronous motor permanent magnetic field aberration real-time detection and analysis method and device |
| 12/15/2009 | US7633319 Digital QP detecting apparatus, spectrum analyzer having the same, and digital QP detecting method |
| 12/10/2009 | WO2009147474A2 Methods of calibrating a clock using multiple clock periods with a single counter and related devices and methods |
| 12/10/2009 | WO2009146765A1 System for measuring high-frequency signals having standardized power supply and data interface |
| 12/10/2009 | US20090306920 Computer system with integrated electromagnetic-interference detectors |
| 12/10/2009 | US20090306917 Sampling apparatus and sampling method |
| 12/10/2009 | US20090302829 Spectrum analyzer system and spectrum analyze method |
| 12/10/2009 | US20090302828 Oscillating system and assistant measuring circuit for oscillator |
| 12/09/2009 | CN100567998C System and method for measuring tiny frequency deviation |
| 12/03/2009 | WO2009143902A1 Signal processing device and method for detecting and locating spectral shapes |
| 12/03/2009 | US20090299666 Fourier Transform-Based Phasor Estimation Method and Apparatus Capable of Eliminating Influence of Exponentially Decaying DC Offsets |
| 12/03/2009 | US20090299665 Method for automatically detecting and characterizing spectral activity |
| 12/03/2009 | US20090299540 Emergency frequency load shedding scheme |
| 12/03/2009 | US20090295493 Self-Calibrating Modulator Apparatuses and Methods |
| 12/03/2009 | US20090295406 Silicon mems resonators |
| 12/02/2009 | EP2128634A1 Radio and/or television signal measuring device |
| 12/02/2009 | CN201355807Y Circuit structure of frequency measurement generating device |
| 12/02/2009 | CN101595390A Synchronous phasor measuring device and inter-bus phase angle difference measuring device employing it |
| 12/02/2009 | CN101594128A Synchronizing pulse synthesizing method and synchronizing pulse synthesizer for combined navigation processor |
| 12/02/2009 | CN101592715A Device and method for testing electric induction magnetic conversion factors of ferroelectric materials |
| 12/02/2009 | CN100565224C Actual-ray and image-ray distinction in frequency converters for spectrum analysers |
| 11/26/2009 | DE10043160B4 Tonsignalerkennungsschaltung und Verfahren zur Erkennung von Tonsignalen Tonsignalerkennungsschaltung and method for detection of tone signals |
| 11/25/2009 | EP2124068A1 Ac electric quantity measuring device |
| 11/25/2009 | CN201352236Y Harmonic power meter based on Kaiser window double-spectrum-line interpolation FFT |
| 11/25/2009 | CN201352235Y Three-phase multifunctional electric energy meter |
| 11/25/2009 | CN201352234Y Three-phase multifunctional electric energy meter |
| 11/25/2009 | CN101587156A Method and apparatus for measuring electron density of plasma and plasma processing apparatus |
| 11/25/2009 | CN101587146A Parameter detection method for harmonic wave and indirect harmonic wave |
| 11/25/2009 | CN101587145A Photon technical multi-microwave frequency component measurement scheme by using incoherent light source |
| 11/25/2009 | CN101587143A CT charge on-line detection device and detection method |
| 11/24/2009 | US7622908 Built-in system and method for testing integrated circuit timing parameters |
| 11/19/2009 | WO2009137873A1 Apparatus for applying a load |
| 11/19/2009 | US20090287437 Complex phase locked loop |
| 11/19/2009 | US20090284383 Data acquisition system for system monitoring |
| 11/18/2009 | CN101583881A Signal analyzer and its data generation method |
| 11/18/2009 | CN101581741A Device for measuring railway frequency-shift signal and application method thereof |
| 11/17/2009 | US7620511 Method for determining plasma characteristics |
| 11/12/2009 | WO2009136329A1 Calibration of linear time-invariant system's step response |
| 11/12/2009 | US20090278617 Crystal-less Communications Device and Self-Calibrated Embedded Virtual Crystal Clock Generation Method |
| 11/12/2009 | US20090278616 Method and system for correcting oscillator frequency drift |
| 11/11/2009 | CN201345545Y Circuit for detecting parallel resonance fundamental wave |
| 11/11/2009 | CN201344952Y Rapid fundamental current detection circuit |
| 11/11/2009 | CN100559192C Phase frequency discriminator |
| 11/05/2009 | US20090273372 Half bin linear frequency discriminator |
| 11/04/2009 | EP2113777A1 Signal analyzer and method for displaying frequency domain data |
| 11/04/2009 | EP2113776A1 Frequency measuring instrument |
| 11/04/2009 | CN201340444Y Module for detecting residual voltage frequency of generator |
| 11/04/2009 | CN201340435Y Energy source metering and analyzing system |
| 11/03/2009 | US7613538 Compensation for distortion in contact lithography |
| 11/03/2009 | US7612551 System of phonon spectroscopy |