| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 10/14/1987 | CN86102015A Analytical instrument of double triphase real-time electric power harmonic wave |
| 10/13/1987 | US4699466 Optical RF filtering system |
| 10/07/1987 | EP0239614A1 Compressive receiver having pulse width expansion |
| 09/30/1987 | CN86101729A Miniature adjustable inner-vacuum cesium beam tube |
| 09/22/1987 | US4695792 Method and system for measuring the amplitude and phase angle of harmonics in a periodic signal |
| 09/22/1987 | US4695791 Auto ranging of a frequency measuring instrument |
| 09/22/1987 | US4695790 RF frequency spectrum analyzer subsystem |
| 09/22/1987 | US4695781 Digital time interval measuring apparatus |
| 09/15/1987 | US4694263 Frequency modulation monitor circuit and method |
| 09/15/1987 | US4694256 Compensation circuit for pulse signals |
| 09/02/1987 | CN86206952U Four bit full digital circuit frequency meter |
| 08/27/1987 | WO1987005169A1 Signal processing system |
| 08/25/1987 | US4689752 System and apparatus for monitoring and control of a bulk electric power delivery system |
| 08/25/1987 | US4688429 Determination of the spectral content of transient stress wave events |
| 08/20/1987 | DE3604996A1 Method for detecting sub-synchronous oscillations on AC voltage cables, and devices for carrying out the method |
| 08/19/1987 | EP0232609A2 Measurement and control apparatus |
| 08/18/1987 | US4688236 Process for the use of a binary register with n bistable cells making it possible to determine the ratio of two frequencies and apparatus for performing the process |
| 08/11/1987 | US4686457 Method for measuring a signal's frequency components |
| 08/05/1987 | CN86205140U Portable microcomputer phase-time freq. meter |
| 08/04/1987 | US4685065 Portable sampling spectrum analyzer |
| 07/28/1987 | CA1224878A1 Apparatus and method for suppressing side lobe response in a digitally sampled system |
| 07/22/1987 | EP0229443A1 Method and apparatus for identifying the components of a signal |
| 07/22/1987 | EP0229265A1 Variable radiation flame monitor with interference signal suppression |
| 07/22/1987 | EP0229103A1 Portable spectrum analyzer |
| 07/15/1987 | EP0228558A1 Selective flame monitoring circuit for multiple burner installations |
| 07/14/1987 | US4680540 Device for measuring average frequencies |
| 07/07/1987 | US4678987 Feature extractor for quasi-periodic signals |
| 07/01/1987 | CN86107433A Measurement and control apparatus |
| 06/30/1987 | US4677619 Method and apparatus for supervising digital radio transmission line |
| 06/30/1987 | US4677322 Frequency comparator circuits |
| 06/30/1987 | CA1223454A1 Counting apparatus and method for frequency sampling |
| 06/18/1987 | WO1987003695A1 Enhanced frequency determination for spectrum analyzers |
| 06/16/1987 | US4674125 Real-time hierarchal pyramid signal processing apparatus |
| 06/11/1987 | DE3543282A1 Circuit arrangement for identifying the repetition frequency of a signal |
| 06/10/1987 | EP0224563A1 High speed digital frequency counter |
| 06/09/1987 | US4672556 Frequency detector system |
| 06/09/1987 | US4672309 RF personnel dosimeter and dosimetry method for use therewith |
| 06/09/1987 | US4672308 Enhanced frequency determination for spectrum analyzers or the like |
| 06/02/1987 | US4670718 Frequency synthesizing circuit |
| 06/02/1987 | US4670712 Frequency measurement method and device |
| 06/02/1987 | US4670665 Digital pulse width detector |
| 06/02/1987 | CA1222584A1 Programmable trigger coupling circuit |
| 05/27/1987 | EP0223507A2 Transmission line sensor apparatus |
| 05/26/1987 | US4669051 Vector network analyzer with integral processor |
| 05/26/1987 | US4668910 Method and circuit for determining the presence or absence of at least one frequency of known value in an input signal composed of several frequencies |
| 05/19/1987 | US4667152 Method of and system for determining locations of sources of harmonics in a power distribution network |
| 05/19/1987 | US4667151 Calibrated radio frequency sweep |
| 05/13/1987 | CN86201598U Staggering resonance filter and measure circuit utilizing discriminating phase tunning |
| 05/12/1987 | US4665494 Spectrum display device for audio signals |
| 05/12/1987 | CA1221737A1 Frequency determining and lockon system |
| 04/29/1987 | EP0219962A1 Improved line frequency monitor |
| 04/28/1987 | US4661986 Depth-of-focus imaging process method |
| 04/28/1987 | US4661769 Measurement of magnitude and phase angle of voltage and current phasors and frequency deviation in power systems |
| 04/28/1987 | US4661767 Vector network analyzer with integral processor |
| 04/28/1987 | EP0205554A4 Interlaced digital video input filter/decimator and/or expander/interpolator filter. |
| 04/22/1987 | EP0218737A1 Device for driving a cross-coil instrument |
| 04/22/1987 | EP0110893B1 Process and device for detecting frequency variations |
| 04/21/1987 | US4660150 Spectrum analyzer with improved data analysis and display features |
| 04/15/1987 | EP0218225A2 Transmission line mounted sensor module |
| 04/15/1987 | EP0218224A2 Tool for mounting a sensor module on a live power transmission line |
| 04/15/1987 | EP0218223A2 Hinge clamp for securing a sensor module on a power transmission line |
| 04/15/1987 | EP0218222A2 Apparatus for data transmission from multiple sources on a single channel |
| 04/15/1987 | EP0218221A2 Apparatus for measuring the potential of a transmission conductor |
| 04/15/1987 | EP0218220A2 Apparatus for measuring and calculating fourier components of a power line parameter |
| 04/15/1987 | EP0217967A1 Heterodyne-type method and apparatus for measuring signals, having means for automatically correcting the detuning |
| 04/15/1987 | EP0217953A1 Doppler signal analyzer |
| 04/14/1987 | US4658364 Signal processing apparatus |
| 04/09/1987 | WO1987002141A1 Compressive receiver having pulse width expansion |
| 04/08/1987 | CN85107272A Portable frequency meter |
| 04/07/1987 | US4656598 Alias detector for digital oscilloscopes |
| 04/01/1987 | CN86106042A Method and apparatus for identifying the components of a signal |
| 03/24/1987 | US4652817 Acousto-optic chip rate detector |
| 03/24/1987 | US4652816 Calibrated radio frequency analog spectrum analyzer |
| 03/17/1987 | US4651089 Frequency counting arrangement |
| 03/11/1987 | EP0213233A1 Digital circuit to classify the frequency range of the frequency of a signal |
| 03/10/1987 | US4649569 Transceiver with auto frequency sense |
| 03/10/1987 | US4649496 Spectrum analyzer with improved data analysis and display features |
| 03/03/1987 | US4647847 Method and apparatus for eliminating harmonic skip |
| 02/26/1987 | EP0116625A4 Multiple simultaneous tone decoder. |
| 02/25/1987 | CN86101904A Intelligence frequency meter with high-resolution |
| 02/24/1987 | US4646254 Noise threshold estimating method for multichannel signal processing |
| 02/24/1987 | US4646004 Phase-locked sampling of a periodic signal |
| 02/17/1987 | US4644268 Apparatus and method for determining the magnitude and phase of the fundamental component of a complex waveshape |
| 02/17/1987 | US4644267 Signal analysis receiver with acousto-optic delay lines |
| 02/17/1987 | CA1218121A1 Signal processing system and method |
| 02/03/1987 | US4641090 Polyphase electrical signal measuring apparatus |
| 02/03/1987 | US4641086 Vector network analyzer with integral processor |
| 01/28/1987 | EP0210007A1 Distortion surveillance apparatus |
| 01/28/1987 | EP0209656A2 Method and device for evaluating a pulse train containing information in the frequency and the pulse width |
| 01/21/1987 | EP0209375A2 High dynamic range in NMR data acquisition |
| 01/17/1987 | CN85103340A 跟踪滤波器 Tracking filter |
| 01/17/1987 | CN85101624A Frequency and time measurement circuit |
| 01/14/1987 | EP0208602A1 Method for using an N bistable cells binary register in the ratio mesasurement of two frequencies, and apparatus for carrying out this method |
| 01/13/1987 | US4636718 Acousto-optical spectrum analyzer with expanded frequency resolution |
| 01/13/1987 | US4636717 Vector network analyzer with integral processor |
| 01/06/1987 | US4635207 Field measuring system |
| 01/06/1987 | US4634966 Binary processing of sound spectrum |
| 01/06/1987 | US4634962 Phase noise analyzer |
| 01/06/1987 | US4634955 Malfunction detector for detecting open-circuit condition at DC generator output terminal |
| 12/30/1986 | US4633516 Instantaneous frequency measurement receiver with digital processing |