| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 05/08/2013 | CN103091541A Intelligent substation secondary transient voltage measuring device and measuring method |
| 05/08/2013 | CN102053647B Device for adjusting power consumption and method thereof |
| 05/02/2013 | WO2013063187A2 Shielding integrity testing for cable drop |
| 05/02/2013 | US20130106523 Oscillator |
| 05/02/2013 | US20130106398 Gain measurement circuit, gain measurement method, and communication apparatus |
| 05/01/2013 | CN103076496A Frequency detection device and method of cantilever beam capacitance type micro mechanical microwave power sensor |
| 05/01/2013 | CN103076495A Frequency detection device based on indirect-type micro-mechanical microwave power sensor |
| 05/01/2013 | CN102193029B Method for measuring short-term frequency stability of unconventional sampling time |
| 05/01/2013 | CN102135570B Synchronous phasor measuring method and device for intelligent transformer substation |
| 04/30/2013 | US8432152 Apparatus for feeding antenna elements and method therefor |
| 04/30/2013 | US8432151 Film-thickness measuring device using PLL circuit |
| 04/25/2013 | WO2013057416A1 Method and device for analysing the quality of the electrical energy in a three-phase electric network |
| 04/25/2013 | WO2013056609A1 Electric energy quality type energy efficiency data acquisition terminal |
| 04/25/2013 | DE10392151B4 Verfahren und Vorrichtung zur Erfassung im Frequenzbereich basierend auf einer Zeitbereichsmessung Method and apparatus for detection in the frequency domain based on a time domain measurement |
| 04/25/2013 | CA2849963A1 Method and device for analysing the quality of the electrical energy in a three-phase electric network |
| 04/24/2013 | CN202903880U Weak signal detection circuit based on chaotic oscillator |
| 04/24/2013 | CN103067014A Frequency following data acquisition circuit used for harmonic detection |
| 04/24/2013 | CN103063917A High-precision phase and frequence measuring system |
| 04/24/2013 | CN103063916A Constant-voltage transformer (CVT) harmonic testing method based on capacitance currents |
| 04/24/2013 | CN103063915A Frequency detection device and method based on direct type micro-machine microwave power sensor |
| 04/24/2013 | CN103063914A Weak signal detection circuit based on modulation bistable stochastic resonance theory |
| 04/24/2013 | CN103063913A Frequency tracking method for Fourier transform |
| 04/24/2013 | CN102338827B Method for analyzing electric network waveform distortions and automatically monitoring electric power harmonic parameters |
| 04/24/2013 | CN102175445B Simulation test device for hydroturbine speed-regulating system |
| 04/24/2013 | CN102169140B Clock frequency detection circuit |
| 04/24/2013 | CN102147429B 宽带微波功率计以及干扰信号滤除方法 Broadband microwave power meter and filter out the interference signal method |
| 04/24/2013 | CN102033160B Silicon wafer-level frequency testing method |
| 04/23/2013 | US8428907 Jitter calculating device, jitter calculating method and jitter calculating program |
| 04/23/2013 | US8428898 Method and system for correcting frequency response of a signal sampler |
| 04/23/2013 | US8427175 Correction of non-linearities in ADCS |
| 04/18/2013 | US20130093436 Electromagnetic method for sensing the relative position of two items using coupled tuned circuits |
| 04/17/2013 | CN202886470U Harmonic monitoring and recording device of electric smelting furnace |
| 04/17/2013 | CN202886469U Digital spectrum analyzer based on FPGA (Field Programmable Gate Array) |
| 04/17/2013 | CN202886468U Wideband electronic frequency meter |
| 04/17/2013 | CN202886467U Automatic break point searching device of constant-temperature crystal oscillator |
| 04/17/2013 | CN202886466U Multichannel vibratory string signal automatic collection apparatus |
| 04/17/2013 | CN202886465U Frequency test system based on single-chip microcomputer |
| 04/17/2013 | CN103048540A Online microwave frequency detector and detecting method thereof based on cantilever beam and direct-type power sensor |
| 04/17/2013 | CN103048539A Accurate acquisition device and method of power frequency in audio forensics |
| 04/17/2013 | CN103048538A Method for testing collective frequency of radio frequency card and tester for realizing method |
| 04/17/2013 | CN102323503B Method for detecting inrush current distortion of transformer based on Rogowski coil |
| 04/17/2013 | CN102043070B Amplitude-modulated dynamometric gradometer for feeding back fixed amplitudes as well as scanning force microscopy and frequency measurement instrument |
| 04/17/2013 | CN101968510B High-resolution measuring circuit and method thereof for frequency of output signal of resonator sensor |
| 04/16/2013 | US8421440 Apparatus for spectrum sensing and associated methods |
| 04/11/2013 | US20130090874 Electromagnetic spectrum aerial surveying |
| 04/11/2013 | US20130088213 Current switch with automatic calibration |
| 04/10/2013 | CN202870168U System using simulation bandwidth pre-switching for realizing spectrum analyzer resolution bandwidth |
| 04/10/2013 | CN202870167U System for realizing spectrum analyzer whole-band scanning by using point-by-point phase locking |
| 04/10/2013 | CN202870151U Harmonic current test system with novel current converter |
| 04/10/2013 | CN103033685A Broadband harmonic collection and measurement system based on multi-band double-way filtering and broadband harmonic collection and measurement method based on the same |
| 04/10/2013 | CN103033684A Frequency detection device based on clamped beam capacitor type micro-mechanical microwave power sensor |
| 04/10/2013 | CN103033683A Passive radio frequency identification devices (RFID) electronic tag resonant frequency detection system based on Chirp signal and passive RFID electronic tag resonant frequency detection method based on the Chirp signal |
| 04/10/2013 | CN102128980B Method for detecting frequency at static variable-frequency starter end of pumped storage power station |
| 04/10/2013 | CN102033161B Frequency measuring method of alternating current signal |
| 04/10/2013 | CN101915873B Single wavelength type microwave frequency measurement scheme adopting orthogonal optical power ratios |
| 04/10/2013 | CN101867381B Method for realizing down conversion of radio frequency spectrometer by narrow-band local oscillation and switch filtering |
| 04/10/2013 | CN101833035B Linear frequency-modulated parameter estimating method and implementing device thereof |
| 04/09/2013 | US8415624 Differential wavelength imaging method and system for detection and identification of concealed materials |
| 04/04/2013 | US20130083819 Method for operating an arc furnace, oscillation measurement device for an arc electrode and configuration for an arc furnace |
| 04/04/2013 | DE102011083736A1 Verstärkungseinstellung bei einem Hörhilfegerät Gain setting for a hearing aid |
| 04/03/2013 | CN202854232U Intermediate frequency digitization frequency spectrum analyzer |
| 04/03/2013 | CN202854231U Novel frequency spectrum analyzer |
| 04/03/2013 | CN202854185U Square-wave signal generator for measuring resonant frequency of resonance grounding net |
| 04/03/2013 | CN202854173U Novel rubber feet for frequency spectrum analyzer |
| 04/03/2013 | CN103026247A Configurable electronic device reprogrammable to modify the device frequency response |
| 04/03/2013 | CN103023488A Frequency correction method and system |
| 04/03/2013 | CN103018601A Primary fault diagnosis method of converter in wind turbine system |
| 04/03/2013 | CN103018558A Master-slave multiprocessor real-time signal analyzing method |
| 04/03/2013 | CN103018557A Normalization master-slave type harmonic wave and inter-harmonic wave real-time analysis method |
| 04/03/2013 | CN103018556A Frequency counter |
| 04/03/2013 | CN103018555A High-precision electric power parameter software synchronous sampling method |
| 04/03/2013 | CN103018554A Frequency detecting method and device |
| 04/03/2013 | CN103018553A Wireless sensor network frequency spectrum monitoring and displaying method based on browser/server software architecture |
| 04/03/2013 | CN103018537A Disturbance classification and recognition method for quality of transient electric energy based on CWD Choi-Williams Distribution spectral kurtosis |
| 04/03/2013 | CN103018534A Method and system for determining harmonic voltage |
| 04/03/2013 | CN101741481B Antenna feeder system performance test method and device |
| 04/03/2013 | CN101501507B Apparatus for measuring distortion power quality index and method of operating the apparatus |
| 04/02/2013 | US8410771 Method and apparatus for spectrum detection |
| 03/28/2013 | WO2013042846A1 System for measuring a wave source |
| 03/27/2013 | EP2572549A1 Method and arrangement for adaptive signal detection |
| 03/27/2013 | CN202837467U Convenient and telecontrol channel testing device |
| 03/27/2013 | CN202837398U Intelligent power frequency distortion measuring instrument |
| 03/27/2013 | CN202837397U Broadband high-sensitivity frequency measuring circuit |
| 03/27/2013 | CN202837396U Chip frequency detector of smart card |
| 03/27/2013 | CN103001627A Trimming control system for resonance frequency of quartz crystals |
| 03/27/2013 | CN102998572A Playback device and method for recording power qualities |
| 03/27/2013 | CN102998528A Method for extracting frequency components in dynamic distorted sinusoidal signals and device for implementing method |
| 03/27/2013 | CN102998527A Pass band type fundamental wave, harmonic wave and direct current component detection method |
| 03/27/2013 | CN102998526A Disturbance signal frequency measurement method |
| 03/27/2013 | CN102024314B Method and device for replacing rotating platform signal slip ring |
| 03/27/2013 | CN101753227B Radio frequency (RF) testing system and method for testing RF of multiple mobile communication devices |
| 03/27/2013 | CN101501476B Passive intermodulation distortion measuring method and system |
| 03/26/2013 | US8407268 Method for determining an optimum sampling frequency, and a power analyzer performing the method |
| 03/26/2013 | US8405379 System and method for the analysis of DNA sequences in biological fluids |
| 03/21/2013 | US20130069626 Perpendicular spin torque oscillator FMR frequency measurement method |
| 03/20/2013 | CN202815090U 频率脉冲信号处理电路 Frequency of the pulse signal processing circuit |
| 03/20/2013 | CN202815089U Active probe for measuring KHz-rate clock |
| 03/20/2013 | CN202815053U Harmonic wave universal meter |
| 03/20/2013 | CN202815052U Electronic measurement device with compound functions |
| 03/20/2013 | CN102981052A Broadband electronic frequency meter |