Patents
Sitemap › G01 - Measuring; Testing › G01R - Measuring electric variables; Measuring magnetic variables › G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503)
10/2012
10/31/2012CN102759659A Method for extracting harmonic wave instantaneous value of electric signals in electric system
10/31/2012CN102759658A Method for automatically setting frequency span in a spectrum analyzer
10/31/2012CN102759646A Testing method and device of harmonic wave universal meter
10/30/2012US8301406 Methods for prognosing mechanical systems
10/30/2012US8300153 Video selection display unit for multiple devices
10/30/2012US8299777 Calculating a parasitic capacitance of an oscillator circuit
10/25/2012US20120268104 Signal detection apparatus for sas devices
10/25/2012DE112009003680T5 Verfahren zum Ermitteln der Frequenz oder Periode eines Signals Method for determining the frequency or period of a signal
10/25/2012DE102010002370B4 Fehlerdetektion in einer integrierten Schaltung Error detection in an integrated circuit
10/24/2012EP2515127A1 Apparatus and method for analyzing a frequency spectrum using overlapped frequency bands
10/24/2012CN202502153U Frequency detection circuit of load monitor
10/24/2012CN102753982A A method of subsynchronous resonance detection
10/24/2012CN102753981A Logarithmic mean-square power detector
10/24/2012CN102752003A Portable sweep-frequency all-band receiver
10/24/2012CN102749595A Method for measuring residual magnetic induction density of iron core of transformer
10/24/2012CN102749521A Method for computing harmonic impedance of power system
10/24/2012CN102749513A Method of measuring intermodulation distortion frequency spectrum through vector network analyzer
10/24/2012CN102749512A Minimal reconfiguration spectrum stitching with overlapped bands
10/24/2012CN102749511A Distributed spectrum analyzer and method for conducting spectrum analysis by using same
10/24/2012CN102749510A Method and FPGA (Field Programmable Gate Array) device for performing multi-channel digital frequency measurement
10/24/2012CN102749509A Signal sampling test method
10/24/2012CN102749508A Frequency measurement device and method
10/24/2012CN102749488A Power grid harmonic wave real-time on-line monitor and method for detecting harmonic wave using same
10/23/2012US8296087 Interrogation method for passive wireless sensor interrogation system
10/18/2012US20120265465 Signal analyzing system and method using continuous shifted transform
10/18/2012US20120262186 Method, system and computer-readable media for measuring impedance of an energy storage device
10/17/2012CN102735979A Power quality and loss comprehensive monitoring system of high power rectification system
10/17/2012CN102735943A Sensor for detecting resonance frequency and Q-value of passive electronic tag
10/17/2012CN102735930A Alternator speed estimation using spectrum analysis
10/17/2012CN102735929A Device and method for testing APD measuring device
10/17/2012CN102735928A Cantilever beam frequency detector and detection method based on micromechanical gallium arsenide
10/17/2012CN102735927A Frequency detector based on micro-mechanical silicon-based cantilever beam and detection method
10/17/2012CN102735926A Frequency detector based on micro-mechanical gallium arsenide-based clamped beam and detection method
10/17/2012CN102735925A Micromechanical silicon-based clamped beam-based frequency detector and detection method
10/17/2012CN102735924A Frequency transient characteristic detector in superheterodyne microwave analyzer and frequency transient characteristic detection method
10/17/2012CN102735922A Low-cost single-phase harmonic electric energy meter
10/16/2012US8289088 Inverting difference oscillator
10/16/2012US8289033 Systems and methods for detecting resonance on a direct current voltage bus
10/11/2012US20120256616 HAND-HELD MICROWAVE SPECTRUM ANALYZER WITH OPERATION RANGE FROM 9 KHz TO OVER 20 GHz
10/10/2012CN202486213U Electric energy harmonic measurement device based on system on programmable chip (SOPC)
10/10/2012CN202486207U Three phrase network voltage sampling module of a photovoltaic inverter and wind energy convertor system
10/10/2012CN202486204U Converter detector
10/10/2012CN102721890A Practical monitoring device for virtual terminal power grid
10/10/2012CN102721870A SVD (Singular Value Decomposition) digital filter-based electric power system harmonic analysis method
10/10/2012CN102721869A Re-sampling acquired data to prevent coherent sampling artifacts
10/10/2012CN102721868A Self-adaptive frequency measurement circuit and frequency measurement method thereof
10/10/2012CN102721867A Pointer type frequency tester for current meter
10/10/2012CN102721866A Pointer type frequency meter of direct current milliammeter
10/10/2012CN102721865A Method and system for measuring accuracy of crystal oscillators
10/10/2012CN102721864A System and method for time-staggered acquisition of high-frequency electric-arc signal
10/10/2012CN102721863A Multi-frequency signal measurement method for microwave measurement line
10/10/2012CN102721465A System and method for diagnosing and preliminarily positioning loosening faults of iron core of power transformer
10/10/2012CN101788606B Systems and methods for detecting resonance on a direct current voltage bus
10/10/2012CN101536551B Method of determining the harmonic and inharmonic portions of a response signal of a device
10/09/2012US8285764 System and method for statistically separating and characterizing noise which is added to a signal of a machine or a system
10/04/2012WO2012130163A1 Method for generator subsynchronous current calculation, subsynchronous over-current and divergence protection
10/03/2012EP2504712A2 Logarithmic mean-square power detector
10/03/2012CN202471789U Signal acquisition device
10/03/2012CN102713648A Method and device for monitoring a frequency signal
10/03/2012CN102707222A Abnormal frequency point identification method based on character string comparison
10/03/2012CN102707158A Method for testing molten drops of vacuum consumable electrode arc furnace based on saturable reactor stabilized current supply
10/03/2012CN102707143A Method for extracting harmonic components from electromagnetic spectrum by using gray multi-cycle model
10/03/2012CN102707142A Frequency spectrum analyzing method and device of control object
10/03/2012CN102707141A Multi-domain test and measurement instrument
10/03/2012CN101750561B Electrical energy quality monitoring and evaluating system
10/03/2012CN101479611B Methods and apparatus for sensing unconfinement in a plasma processing chamber
10/02/2012US8280655 Digital power monitoring circuit and system
09/2012
09/27/2012US20120242324 Frequency error detection apparatus
09/26/2012CN202455334U Electronic counter
09/26/2012CN202453436U Automatic testing device for wireless station
09/26/2012CN102692563A Clock frequency detector
09/26/2012CN102692562A Circuit used for testing flash frequency and method thereof
09/26/2012CN102692561A Flash frequency test circuit and test method thereof
09/26/2012CN102692540A Frequency tracking alternating-current sampling method
09/26/2012CN102033164B Method and system for calculating sequence of fundamental component sampled signals of electric signals
09/26/2012CN101762758B System for monitoring and orientating electric power quality pollution source in electric network
09/25/2012US8274313 Wake-up circuit and an on board unit including the same, a filter, methods for frequency detection and filtering
09/20/2012US20120239301 Method for analyzing fluid properties
09/19/2012EP2501041A1 Frequency judgment device, voltage comparator circuit, and frequency measurement device
09/19/2012CN102684195A Low pass filter, active power filtering device and harmonic detection method
09/19/2012CN102680826A Method for realizing test of embedded local-oscillator frequency converter by utilizing vector network analyzer
09/19/2012CN102680824A Electric energy quality detecting and analyzing system for pantograph-catenary current collection based on DSP (Digital Signal Processor)
09/19/2012CN102680785A Synchronous phasor measurement method based on self-adoption variable window
09/19/2012CN102680784A United low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers
09/19/2012CN102680783A Dislocation analysis weighting method capable of improving interharmonic calculation accuracy
09/19/2012CN102680782A Method for calculating high-frequency signal frequency by utilizing low-frequency clock source
09/19/2012CN102680781A Calibration device and metamaterial resonant frequency testing platform
09/19/2012CN102680777A Intelligent realization method for measuring gain compression by utilizing network instrument
09/19/2012CN102680756A Electronic measurement method and device with compound functions
09/19/2012CN102073055B Method for testing fixed offset of temperature compensated crystal oscillator in GPS (Global Positioning System) receiver
09/13/2012US20120232821 Multi-channel optical coherence tomography for imaging and temperature and force sensing
09/12/2012CN102662108A Measuring method and device of sine wave local distortion
09/12/2012CN102662094A Dynamic characteristics calibration method of current/frequency conversion circuit
09/07/2012WO2012117551A1 Ac electric quantity measuring device and ac electric quantity measuring method
09/06/2012US20120226458 Sfp - diagnostic
09/05/2012EP2495574A1 Method for determining the frequency of a pulse input signal
09/05/2012EP2495535A1 Wireless monitoring device for electric power grid
09/05/2012CN202421479U Multi-parameter test device
09/05/2012CN202421428U Hot-line detection equipment for partial discharge of transformer substation
09/05/2012CN202421332U High precision electric parameter analyzer
1 ... 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ... 76