| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 06/26/2013 | CN203025229U PWM (pulse width modulation) waveform detection and screen display device for permanent magnet synchronous motor |
| 06/26/2013 | CN203025228U Multi-rate network electric meter |
| 06/26/2013 | CN103180987A An apparatus for spectrum sensing and associated methods |
| 06/26/2013 | CN103176045A Method and system for pilot frequency bi-phase coincidence detection based on coincidence pulse counting |
| 06/26/2013 | CN103176044A Spectrum analyzer with standing wave measuring function and standing wave measuring method thereof |
| 06/26/2013 | CN103176043A Signal generator with frequency meter and signal processing method |
| 06/26/2013 | CN103176042A Frequency measurement method and device and frequency meter |
| 06/26/2013 | CN103176004A Method, device and frequency spectrum analyzer for providing sine wave clock |
| 06/26/2013 | CN102175918B Universal digital geophone implementation method and device |
| 06/25/2013 | US8473234 Method and detection assembly for the detection of changes in a building structure of a wind turbine |
| 06/20/2013 | WO2013086887A1 Method for measuring phasor frequency of electric power system |
| 06/20/2013 | US20130158924 Digital circuit and method for measuring ac voltage values |
| 06/20/2013 | US20130158923 Frequency mask trigger with non-uniform bandwidth segments |
| 06/19/2013 | EP2605025A1 Frequency mask trigger with non uniform bandwidth segments |
| 06/19/2013 | CN203012015U Harmonic energy metering system improving Fourier transformation |
| 06/19/2013 | CN103165968A High directivity directional coupler |
| 06/19/2013 | CN103163373A Calculating method suitable for harmonic pollution responsibilities in power quality data interchange format |
| 06/19/2013 | CN103163372A Method for analyzing harmonics of power system by adopting Hilbert-Huang transform (HHT) |
| 06/19/2013 | CN103163371A Portable detector for high-voltage transmission line harmonic waves |
| 06/19/2013 | CN103163370A Testing method for intelligent electric energy meter clock frequency under high-temperature environment |
| 06/19/2013 | CN102353838B Rapid high precision frequency measuring realization method by applying FPGA chip |
| 06/19/2013 | CN102323481B Measuring apparatus for unstable harmonics and interharmonics |
| 06/19/2013 | CN102087313B Frequency estimation method for satellite search and rescue signal |
| 06/19/2013 | CA2792785A1 Pulse width modulated voltage measuring circuit and method |
| 06/18/2013 | US8467985 Automated synchronization of data between electrical grids |
| 06/13/2013 | WO2013083560A1 Method for monitoring a frequency signal and corresponding sensor unit for a vehicle |
| 06/13/2013 | US20130147562 Measuring bias temperature instability induced ring oscillator frequency degradation |
| 06/13/2013 | US20130147462 Fast wideband frequency comparator |
| 06/13/2013 | DE102011088125A1 Verfahren zur Überwachung eines Frequenzsignals und korrespondierende Sensoreinheit für ein Fahrzeug Method for monitoring a frequency signal and corresponding sensor unit for a vehicle |
| 06/12/2013 | CN202998070U Digital frequency voltage conversion circuit |
| 06/12/2013 | CN202998069U Frequency following data acquisition circuit for harmonic detection |
| 06/12/2013 | CN202994902U Low-cost frequency meter circuit |
| 06/12/2013 | CN202994901U Signal measurement device for atom frequency standard |
| 06/12/2013 | CN202994875U A multi-channel calibrating device |
| 06/12/2013 | CN103149436A Inter-harmonic detection system of three-phase active power distribution network |
| 06/12/2013 | CN103149435A Mechanical resonant frequency feature obtaining method for alternating current servo system based on pseudorandom sequence code |
| 06/12/2013 | CN103149434A Method and device for detecting atomic transition center frequency |
| 06/12/2013 | CN102135568B Period detection method and phase difference detection method for alternating current signal |
| 06/12/2013 | CN102116805B Signal energy judgment device and signal energy judgment method |
| 06/11/2013 | US8464089 Tracing apparatus and tracing system |
| 06/11/2013 | US8461821 Frequency measuring apparatus |
| 06/06/2013 | US20130141076 Spread Spectrum Clock Signal Detection System and Method |
| 06/05/2013 | EP2598898A1 Determination of the fundamental frequency of a periodic signal including harmonic components |
| 06/05/2013 | CN202978901U High-frequency large dynamic intermediate frequency sampling device |
| 06/05/2013 | CN202975156U Large dynamic intermediate frequency sampling device |
| 06/05/2013 | CN202975155U Time-domain signal frequency stability measurement device |
| 06/05/2013 | CN202975154U Electromagnetic coupling resonance coil parameter measuring system |
| 06/05/2013 | CN202975143U Detection circuit of automatic change-over switch electric appliance |
| 06/05/2013 | CN202975142U Measuring system based on analog to digital converter |
| 06/05/2013 | CN103140764A Method and arrangement for frequency determination |
| 06/05/2013 | CN103134984A Fast Fourier transform (FFT) broadband frequency spectrometer design based on AD9864 medium frequency digitization system |
| 06/05/2013 | CN103134983A Terahertz coherent detection system based on single mixer and method |
| 06/05/2013 | CN102419398B Phase noise capability verification comparison apparatus applied to Ku and K wave band ranges |
| 06/05/2013 | CN101871904B Gas detecting device, gas detecting system and manufacturing method of gas detecting device |
| 06/04/2013 | US8457913 Computer system with integrated electromagnetic-interference detectors |
| 06/04/2013 | US8456175 Open loop load pull arrangement with determination of injections signals |
| 05/30/2013 | US20130134999 Signal Acquisition System Having Reduced Probe Loading of a Device Under Test |
| 05/29/2013 | CN202956431U CVT embedded power grid voltage harmonic wave monitoring system |
| 05/29/2013 | CN103123374A Detection circuit for low-pass RC (resistor-capacitor) active filter |
| 05/29/2013 | CN102353839B Electric power system harmonics analysis method based on multilayered feedforward neural network |
| 05/28/2013 | US8452544 Utility and method for the application of signal advance amplification to analog waveform or signal detection, acquisition and processing |
| 05/23/2013 | WO2013074690A1 System and method for detecting chirping radar pulses |
| 05/23/2013 | US20130128396 Current measurement |
| 05/23/2013 | DE102011086519A1 Vorrichtung zum Speichern einer Frequenz und Verfahren zum Speichern sowie Auslesen einer Frequenz Means for storing a frequency and method for storing and reading out a frequency |
| 05/22/2013 | CN202948062U PLC-based multichannel frequency measurement module |
| 05/22/2013 | CN202948047U Device for measuring secondary transient voltage in intelligent transformer substation |
| 05/22/2013 | CN103119453A Digital frequency estimation based on quadratic forms |
| 05/22/2013 | CN103117590A Uninterruptible power power-supply system provided with simplified voltage detector circuit |
| 05/22/2013 | CN103116082A Server electromagnetic radiation near field detection and analysis method |
| 05/22/2013 | CN103116073A Cantilever beam and direct-type power sensor based microwave detecting system and detecting method thereof |
| 05/22/2013 | CN103116072A Microwave detecting system based on clamped beams and indirect power sensors and detecting method of microwave detecting system |
| 05/22/2013 | CN103116071A Micro-electromechanical microwave frequency and power detecting system and detecting method thereof |
| 05/22/2013 | CN103116070A Microwave detection system and detection method thereof based on clamped beams and direct-type power sensors |
| 05/22/2013 | CN103116069A Method, device and system of testing of chip frequency |
| 05/22/2013 | CN103116067A On-line microwave frequency detector and detection method thereof based on clamped beams and indirect-type power sensors |
| 05/22/2013 | CN103116064A Method and device for detecting voltage fluctuation and flicker based on energy operator and spectrum correction |
| 05/22/2013 | CN102279477B Electro-optical phase modulator having automatic resonant frequency adjusting function |
| 05/22/2013 | CN102109554B Adaptive real-time detection method for subsynchronous oscillation mode of power grid |
| 05/21/2013 | US8446223 Systems and methods for calibrating real time clock |
| 05/15/2013 | CN202939220U Single-phase harmonic wave detection device |
| 05/15/2013 | CN103105533A Intelligent analysis method and intelligent analysis system of sub-synchronous oscillation |
| 05/15/2013 | CN103105532A Harmonic electric energy measuring system of improved Fourier transform and control method thereof |
| 05/15/2013 | CN103105531A Micro electro-mechanical online microwave frequency detector and detecting method thereof |
| 05/15/2013 | CN103105530A Detection method for frequency hopping changes of crystal oscillator |
| 05/15/2013 | CN103105529A Harmonic wave electric energy measuring system based on parameter analysis and control method thereof |
| 05/15/2013 | CN102323494B Method for distinguishing multiple harmonic sources |
| 05/15/2013 | CN102269787B Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof |
| 05/15/2013 | CN102128975B Voltage stabilization online monitoring phasor data measurement device and phasor measurement method |
| 05/15/2013 | CN102047561B Methods of calibrating a clock using multiple clock periods with a single counter and related devices and methods |
| 05/14/2013 | US8442789 Method and device for determining a frequency mask for a frequency spectrum |
| 05/14/2013 | CA2626245C Meter electronics and methods for determining a phase difference between a first sensor signal and a second sensor signal of a flow meter |
| 05/10/2013 | WO2013066054A1 System for diagnosing partial discharge of power instrument by using contactless phase measuring sensor |
| 05/09/2013 | US20130116957 Fine frequency offset estimation method and apparatus |
| 05/09/2013 | US20130116004 Method for Suppression of Spurs from a Free Running Oscillator in Frequency Division Duplex (FDD) and Time Division Duplex (TDD) Wireless Systems |
| 05/09/2013 | US20130113659 Detection of signals |
| 05/08/2013 | CN202929636U Narrowband-type switch filtering harmonic detector used for ESA system |
| 05/08/2013 | CN202929109U Alarm against electromagnetic interference |
| 05/08/2013 | CN103091575A Operating maintenance tool on site for load monitor |
| 05/08/2013 | CN103091554A Steady-state harmonic wave analyzing method for line terminal synchronous measurement signal multi-bus micro-grid |
| 05/08/2013 | CN103091553A Face recognition spectrum analyzer |