| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 03/22/2012 | US20120072147 Self check-type flame detector |
| 03/22/2012 | US20120068690 Bulk acoustic wave resonator sensor |
| 03/22/2012 | DE102010046099A1 Verfahren und System zur Ermittlung des Entstehungsortes von passiven Intermodulationsprodukten Method and system for determining the origin map of passive intermodulation products |
| 03/21/2012 | CN202171629U 结合天线的可携式频谱分析仪 Combined antenna portable spectrum analyzer |
| 03/21/2012 | CN202171624U A simulation/digital stream signal visualization monitor |
| 03/21/2012 | CN102385003A Method for detecting frequency and phase of voltage signals or current signals in electric power system |
| 03/20/2012 | US8140283 Independent frequency measurement and tracking |
| 03/20/2012 | US8138843 Gated ring oscillator for a time-to-digital converter with shaped quantization noise |
| 03/15/2012 | US20120065911 Method and apparatus for spectrum sensing of fm wireless microphone signals |
| 03/14/2012 | CN102377195A Isolated operation detection device |
| 03/14/2012 | CN102375645A Method for detecting frequency and frequency change |
| 03/14/2012 | CN102375106A Device for testing harmonic influence of electronic mutual inductor |
| 03/13/2012 | US8134356 Operating an integrated circuit at a minimum supply voltage |
| 03/08/2012 | WO2012030769A1 Apparatus and method related to environmental spectrum analysis |
| 03/08/2012 | WO2011144809A8 Method and arrangement for adaptive signal detection |
| 03/08/2012 | US20120059613 Signal parameter estimator |
| 03/07/2012 | EP1828788B1 Dynamic cut-off frequency varying filter |
| 03/07/2012 | CN202159097U 一种直流矿井提升机变流器谐波检测装置 A DC mine hoist converter harmonic detection device |
| 03/07/2012 | CN202159086U 双模式220v用户侧电网相量测量及发送装置 Dual-mode user side 220v power phasor measurement and transmission means |
| 03/06/2012 | US8131511 Apparatus for registering and analyzing the spectral signature of a dynamic event |
| 03/06/2012 | US8131490 Methods and systems for determining a received signal frequency |
| 03/06/2012 | US8131479 Method of proteome analysis for phosphorylated protein |
| 03/06/2012 | US8131403 System and method for determining and utilizing customer energy profiles for load control for individual structures, devices, and aggregation of same |
| 03/06/2012 | US8129980 AC electric quantity measuring device |
| 03/06/2012 | US8128561 Hydration and composition measurement device and technique |
| 03/01/2012 | WO2012025784A1 An audio user interface apparatus and method |
| 02/29/2012 | CN202153238U 基于两次变频技术的数字化频谱仪 Two inverter technology based digital spectrum analyzer |
| 02/29/2012 | CN102364348A Frequency spectrum automatic monitoring analyzer for satellite ground station intermediate-frequency signal |
| 02/29/2012 | CN101750562B Non-PMU measure point dynamic process estimation method based on flow equation sensitiveness analysis |
| 02/29/2012 | CN101561463B Power-on detection circuit for detecting minimum operational frequency |
| 02/29/2012 | CN101419255B Detection circuit for duty ratio of switching power supply, detection method and applications |
| 02/29/2012 | CN101040190B Non-linear frequency and phase measurement scheme |
| 02/28/2012 | US8127138 Method for embedding information in sonar |
| 02/28/2012 | US8126668 Signal detection using delta spectrum entropy |
| 02/28/2012 | US8125250 Frequency detection mechanism for a clock generation circuit |
| 02/28/2012 | US8125249 Frequency measuring circuit and semiconductor device having the same |
| 02/28/2012 | US8125213 System for extraction and analysis of significant radioelectric signals |
| 02/23/2012 | US20120043960 Non-intrusive detection of live electrical lines |
| 02/22/2012 | CN202149925U 并联混合型有源电力滤波器数据采集与数据处理系统 Parallel hybrid active power filter data acquisition and data processing system |
| 02/22/2012 | CN101726663B 一种监测用户侧谐波污染的方法及系统 A method of monitoring the user side method and system harmonic pollution |
| 02/21/2012 | US8121804 Electrical network analysis of a multiphase system |
| 02/21/2012 | US8120394 Automatic frequency calibration circuit and automatic frequency calibration method |
| 02/21/2012 | US8120349 Waveform measuring apparatus wherein the peak-to-peak amplitude is measured |
| 02/16/2012 | US20120041720 High Bandwidth Oscilloscope for Digitizing an Analog Signal Having a Bandwidth Greater than the Bandwidth of Digitizing Components of the Oscilloscope |
| 02/15/2012 | EP2418778A2 Method and device for supplying clock |
| 02/15/2012 | EP2418500A2 Multi-channel frequency domain test and measurement instrument |
| 02/15/2012 | CN102355310A High frequency wire testing machine |
| 02/15/2012 | CN102353839A Electric power system harmonics analysis method based on multilayered feedforward neural network |
| 02/15/2012 | CN102353838A Rapid high precision frequency measuring realization method by applying FPGA chip |
| 02/15/2012 | CN102353837A Method and device for measuring pulse frequency |
| 02/14/2012 | US8115474 Multi-range electrical current measurement |
| 02/14/2012 | US8115472 System and method for space control and remote monitoring |
| 02/14/2012 | US8113048 Dynamic imbalance detection apparatus and method using linear time-varying angular velocity model |
| 02/10/2012 | CA2747468A1 Diagnostics using sub-metering device |
| 02/09/2012 | US20120033323 Systems and Methods for Servo Data Based Harmonics Calculation |
| 02/09/2012 | US20120032837 Network analyzer with an n-port network having at least two ports for measuring the wave parameters of a measurement object |
| 02/08/2012 | CN202143074U 高频线材测试机 High Frequency Cable Tester |
| 02/08/2012 | CN101806842B 电网质量现场记录仪 Power Quality Logger site |
| 02/07/2012 | US8111074 Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment |
| 02/07/2012 | US8110993 Methods for inductively-coupled RF power source |
| 02/02/2012 | WO2012013883A1 Determination of the fundamental frequency of a periodic signal including harmonic components |
| 02/01/2012 | CN202134913U 一种用于检测高压直流输电系统直流侧低次谐振的等效电路 An equivalent circuit for detecting the DC side of HVDC low-order resonance |
| 02/01/2012 | CN102340313A Sampling point loss testing method, device and system for sampling equipment |
| 02/01/2012 | CN102338842A Fault indicator used for 10KV overhead line |
| 02/01/2012 | CN102338827A Method for analyzing electric network waveform distortions and automatically monitoring electric power harmonic parameters |
| 01/31/2012 | US8108167 Method for ascertaining the harmonic components of an analog electrical signal at a fundamental frequency which changes over time |
| 01/31/2012 | US8108165 Acquiring phasors outside the frequency tracking range for power protective relays |
| 01/31/2012 | US8108164 Determination of a common fundamental frequency of harmonic signals |
| 01/26/2012 | US20120019301 Frequency detection mechanism for a clock generation circuit |
| 01/25/2012 | CN102334038A Phase determining device and frequency determining device |
| 01/25/2012 | CN102331535A Alternating current physical quantity measuring device and method as well as data acquisition device and method |
| 01/25/2012 | CN102331529A Stability testing method and system of switch power supply feedback loop |
| 01/25/2012 | CN102331526A Method for acquiring parameters of electric power harmonic waves by using Hanniing window function continuous frequency spectrum interpolation |
| 01/25/2012 | CN102331525A Distributed type on-line harmonic detecting system based on Internet of construction equipment |
| 01/25/2012 | CN102331524A Density trace measurement and triggering in frequency domain bitmaps |
| 01/25/2012 | CN102331523A Detection system and detection method of resonant frequency of small antenna |
| 01/25/2012 | CN101813748B Method for detecting noise of integrated circuit substrate |
| 01/24/2012 | US8102171 Measuring device and measuring method for measuring the envelope power and the mean-power value |
| 01/18/2012 | EP2406643A1 Time domain electromagnetic interference monitoring method and system |
| 01/18/2012 | EP2406641A2 Noise suppression techniques in high precision long-term frequency/timing measurements |
| 01/18/2012 | EP2283574B1 Methods of calibrating a clock using multiple clock periods with a single counter and related devices and methods |
| 01/18/2012 | CN202119847U Detection device of harmonic characteristic of electronic voltage transformer |
| 01/18/2012 | CN202119835U Unstable harmonic and interharmonic measuring instrument |
| 01/18/2012 | CN202119834U Frequency measurement circuit of equal precision |
| 01/18/2012 | CN102323503A Method for detecting inrush current distortion of transformer based on Rogowski coil |
| 01/18/2012 | CN102323494A Method for distinguishing multiple harmonic sources |
| 01/18/2012 | CN102323481A Measuring apparatus for unstable harmonics and interharmonics |
| 01/18/2012 | CN102323480A Electric energy quality analyzing method based on Hilbert-Huang transform |
| 01/18/2012 | CN102323479A Train harmonic current analysis method |
| 01/18/2012 | CN102323478A Flexible wide area power grid harmonic synchronous monitoring system |
| 01/18/2012 | CN102323477A Method and apparatus for measuring interhamonics of power grid |
| 01/18/2012 | CN102323476A Method for measuring harmonic waves and interharmonic waves in electric power system by adopting spectrum estimation and chaology |
| 01/18/2012 | CN102322942A Vibration signal vector ellipse spectrum analyzing method of rotating machinery |
| 01/18/2012 | CN101061652B Channel detecting device, and tuner testing device having the channel detecting device |
| 01/17/2012 | US8098104 Estimation and compensation of oscillator nonlinearities |
| 01/12/2012 | US20120007605 High frequency measurement system |
| 01/12/2012 | US20120007583 Method and device for frequency response measurement |
| 01/11/2012 | CN102313841A Signal detection and triggering using a difference bitmap |
| 01/11/2012 | CN102313840A Logical triggering in the frequency domain |
| 01/11/2012 | CN101726648B Neuron adaptive harmonic current detection circuit based on low pass filter |