| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 10/30/2013 | CN102539915B Method for accurately calculating power harmonic wave parameters through adopting time delay Fourier transform frequency measurement method |
| 10/23/2013 | CN103364635A Spectrum mapping system and implementation method thereof |
| 10/23/2013 | CN103364634A Three-phase alternating-current power supply frequency measuring method |
| 10/23/2013 | CN103364633A Meta-material resonant frequency testing device and testing method |
| 10/23/2013 | CN103364604A Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
| 10/23/2013 | CN103364083A Equal precision frequency measuring-based optical signal detection device and method |
| 10/17/2013 | US20130271112 Adaptive Threshold Voltage For Frequency Input Modules |
| 10/17/2013 | DE102012007436A1 Verfahren und Vorrichtung zur akustischen Ermittlung der Gangart eines Huftieres, insbesondere Nutztieres Method and apparatus for determining the acoustic gait of a hoofed animal, especially domestic animal |
| 10/16/2013 | CN203241473U Double-button equal-precision frequency meter |
| 10/16/2013 | CN103353551A High-speed electric power harmonic wave detector |
| 10/16/2013 | CN103353550A Method for measuring signal frequency and harmonic parameters of electric power system |
| 10/16/2013 | CN102435847B High-precision electrical parameter analyzer |
| 10/15/2013 | US8558533 Passive intermodulation distortion measuring method and system |
| 10/10/2013 | US20130265034 Method and apparatus of dynamic fast spectral survey |
| 10/09/2013 | CN203232097U Electrical control cabinet based on harmonic-wave pollution monitoring in power-utilization environment |
| 10/09/2013 | CN203232096U Simple low frequency digital frequency meter device |
| 10/09/2013 | CN203232095U Mine frequency signal acquisition device |
| 10/09/2013 | CN103344842A On-line monitoring method improving capacitive equipment loss angle tangent value measuring accuracy |
| 10/09/2013 | CN103344829A Analog signal spectral analysis system |
| 10/09/2013 | CN103344828A Novel harmonic emission level assessment method |
| 10/09/2013 | CN103344827A 电子频率计数器 Electronic Frequency Counter |
| 10/09/2013 | CN101685125B Method of testing isolation between wire cables by adopting harmonic waves |
| 10/08/2013 | US8552740 Method of measuring delay in an integrated circuit |
| 10/03/2013 | WO2013148085A1 Edge triggered calibration |
| 10/03/2013 | WO2013147839A1 On-die all-digital delay measurement circuit |
| 10/02/2013 | CN203224567U Iris recognition spectrum analyzer |
| 10/02/2013 | CN203224566U Magnetron radar frequency measurement device based on auto-correlation processing |
| 10/02/2013 | CN103336174A Method for examining AM signal in corona current data on extra-high voltage direct current test line |
| 10/02/2013 | CN103336173A Genetic algorithm based self-adaption harmonic detection method |
| 10/02/2013 | CN103336172A Method and circuit for detecting axle counting frequency signals |
| 09/26/2013 | US20130253867 Signal Processing Method and Associated Apparatus |
| 09/26/2013 | DE102012204785A1 Method for driving fuel pump of electric motor in motor car, involves controlling rotational speed of electric motor, monitoring duty cycle of voltage signal, and generating warning signal when threshold value of duty cycle is reached |
| 09/25/2013 | CN203216993U Power-grid harmonic real-time online monitor |
| 09/25/2013 | CN203216992U Housing of on-line power grid harmonic monitor |
| 09/25/2013 | CN203216991U Voltage and current harmonic wave detection circuit |
| 09/25/2013 | CN203216990U Track frequency shift signal detection device |
| 09/25/2013 | CN203216989U Non-contact test system of RFID tag antenna |
| 09/25/2013 | CN203216988U Multifunctional electric power meter |
| 09/25/2013 | CN103326350A Converter controller, energy conversion system, photovoltaic energy conversion system and method |
| 09/25/2013 | CN103323702A Composite power quality disturbing signal identifying method |
| 09/25/2013 | CN103323688A Method and device for estimating harmonic state of electric power system |
| 09/25/2013 | CN103323668A Spacecraft power source controller bus electromagnetic compatibility conducted emission frequency domain testing method |
| 09/25/2013 | CN103323667A SFM signal parameter estimation method combining Bessel function and virtual array |
| 09/25/2013 | CN103323651A Variable step size affine projection harmonic current detection method based on time coherent average |
| 09/25/2013 | CN101315396B Signal frequency component energy variation measuring method based on wavelet transformation factor summation |
| 09/24/2013 | US8542005 Connecting digital storage oscilloscopes |
| 09/24/2013 | US8542003 Test apparatus to test a data signal and a clock signal output from a device under test |
| 09/19/2013 | US20130241598 Frequency difference calculation circuit, a satellite signal receiving apparatus and frequency difference calculation method |
| 09/19/2013 | US20130241531 Wide Range, High Resolution Frequency Monitor |
| 09/18/2013 | EP2639590A1 Wide range, high resolution frequency monitor |
| 09/18/2013 | CN203204072U Power grid harmonic on-line monitor circuit |
| 09/18/2013 | CN203204071U Installation structure of power grid harmonic on-line monitoring instrument |
| 09/18/2013 | CN203204070U Power grid harmonic on-line monitoring instrument |
| 09/18/2013 | CN203204049U 电压谐波监测仪电路 Voltage harmonic monitor circuit |
| 09/18/2013 | CN103311986A Charger, mobile terminal, charger detection system and detection method thereof |
| 09/18/2013 | CN103308857A Power generator rotating rectifier detecting device and method |
| 09/18/2013 | CN103308804A Method for extracting time-frequency parameters of power quality disturbance signals on basis of fast K-S (Kaiser-S) transformation |
| 09/18/2013 | CN103308766A Harmonic analysis method based on Kaiser self-convolution window dual-spectrum line interpolation FFT (Fast Fourier Transform) and device thereof |
| 09/18/2013 | CN103308765A Wide range, high resolution frequency monitor |
| 09/18/2013 | CN103308764A Frequency field scanning |
| 09/18/2013 | CN103308763A Clock frequency detection device and method |
| 09/18/2013 | CN102323476B Method for measuring harmonic waves and interharmonic waves in electric power system by adopting spectrum estimation and chaology |
| 09/17/2013 | US8538699 Rapid inversion of electromagnetic reconnaissance survey data |
| 09/12/2013 | US20130238265 Method and apparatus for measuring radio-frequency energy |
| 09/11/2013 | CN203191448U Frequency meter used for electric power inspection |
| 09/11/2013 | CN103293379A Effective value based APF (active power filter) harmonic measuring method and control method of direct current side voltage control method thereof |
| 09/11/2013 | CN103293378A Identifying method of dragging power supply system harmonic wave resonant frequency |
| 09/11/2013 | CN103293377A Frequency-voltage converter |
| 09/11/2013 | CN103293376A Frequency stability measuring method and device |
| 09/11/2013 | CN103293375A Metamaterial resonant frequency testing device and testing method |
| 09/11/2013 | CN102305891B On-line monitoring method of low-frequency oscillation of power system |
| 09/11/2013 | CN102193028B Detecting device and detecting method for resonant frequency of electro-optic phase modulator |
| 09/10/2013 | US8531178 Ultrasound probe, method for manufacturing the same, and ultrasound diagnostic apparatus |
| 09/10/2013 | US8531177 Timing detection device |
| 09/04/2013 | EP2633565A1 An apparatus for spectrum sensing and associated methods |
| 09/04/2013 | CN203178365U Electric energy quality high-frequency harmonic wave monitoring apparatus |
| 09/04/2013 | CN203178354U Three-phase AC electronic quantities detection circuit suitable for one-chip microcomputer |
| 09/04/2013 | CN103278709A System for testing property of thunder and lightning traveling wave of power transmission line |
| 09/04/2013 | CN103278686A Harmonic analysis filtering system and intelligently selected harmonic detection method |
| 09/04/2013 | CN103278685A Harmonic duty quantitative allocation method based on statistical data correlation analysis |
| 09/04/2013 | CN103278684A Method of producing voltage deviation accuracy detection waveform |
| 09/04/2013 | CN103278683A Method for improving amplitude measurement accuracy of band switching frequency point |
| 09/04/2013 | CN102519651B Method for determining basic frequency of stay cable when testing cable tension of cable stayed bridge by using vibration method |
| 09/04/2013 | CN102495281B Method for measuring phasor frequency of power system |
| 09/03/2013 | US8527227 Method and device for measuring electromagnetic wave |
| 09/03/2013 | US8525509 Low cost simplified spectrum analyzer for magnetic head/media tester |
| 08/28/2013 | CN203164295U Apparatus for measuring input impedance and resonant frequency of power transmission line iron tower |
| 08/28/2013 | CN203164289U Transformer dielectric spectrum testing system eliminating interference |
| 08/28/2013 | CN203164288U Radio frequency card synthesis frequency tester |
| 08/28/2013 | CN203164287U Magnetic induction type grid cycle drift and current sensing monitoring device |
| 08/28/2013 | CN203164286U Line width measuring apparatus for rubidium atom frequency scale |
| 08/28/2013 | CN103267907A Method for identifying modal parameters of transformer coil |
| 08/28/2013 | CN103267897A Three-phase-locked loop based on reversed Park conversion |
| 08/28/2013 | CN103267895A Method for detecting harmonic current of power grid current |
| 08/28/2013 | CN103267894A Method and system for detection of amplitude spectrum of aperiodic signal |
| 08/28/2013 | CN101625380B Sensor for high voltage environment |
| 08/22/2013 | DE10027789B4 Verfahren und Einrichtung zur Bestimmung von Übertragungsfunktion und Impulsantwort in Niederspannungsnetzen mit Hilfe von Bandspreizsignalen Method and apparatus for determining transfer function and impulse response in low voltage distribution systems using Bandspreizsignalen |
| 08/21/2013 | CN203149053U Power quality monitoring system based on SOPC |
| 08/21/2013 | CN203149032U Fine structure constant detection system |
| 08/21/2013 | CN203149030U Novel intelligent power distribution instrument |