| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 10/13/1999 | EP0949738A2 Improvements in or relating to the application of power-factor correction in ac power systems |
| 10/12/1999 | US5966675 Method and device for monitoring power supply networks |
| 10/12/1999 | US5966405 Frequency deviation measuring device |
| 10/06/1999 | EP0672256A4 Method and apparatus for discriminating computer network signals. |
| 10/05/1999 | US5963510 Time measurement device |
| 09/30/1999 | WO1999049326A1 Vector network analyser |
| 09/30/1999 | DE19912266A1 Multioctave microwave spectrum analyzer using yttrium iron garnet-based local synchronization oscillator |
| 09/29/1999 | EP0945915A2 Radio wave receiving apparatus having an improved antenna resolution |
| 09/29/1999 | EP0945731A1 Real-time signal analyzer |
| 09/28/1999 | US5960373 Frequency analyzing method and apparatus and plural pitch frequencies detecting method and apparatus using the same |
| 09/27/1999 | CA2233490A1 Pilot tone detector |
| 09/23/1999 | CA2266219A1 Subscriber line tester |
| 09/22/1999 | EP0943927A2 Fast, highly accurate frequency measurement technique |
| 09/16/1999 | WO1999046608A1 Simultaneous display of primary measurement values and derived parameters |
| 09/16/1999 | DE19812604C1 Vectorial network analyzer for millimeter wave range |
| 09/16/1999 | DE19549600C2 FM frequency swing measurement device for RF emitted by sender |
| 09/16/1999 | CA2323085A1 Simultaneous display of primary measurement values and derived parameters |
| 09/09/1999 | DE19905077A1 Frequency signal to DC voltage conversion method |
| 09/08/1999 | EP0940004A1 Apparatus for tracking resonant frequency |
| 09/07/1999 | US5949841 Frequency gain display apparatus for L/C band frequency up unit |
| 09/07/1999 | US5949230 Non-contact voltage probe apparatus |
| 09/01/1999 | CN1044958C Microprocessor controlled digital AFT unit |
| 08/31/1999 | US5945899 Permanent magnet twister |
| 08/26/1999 | DE19906801A1 Spectrum diffusion signal analyzer for measuring faults in carrier frequency, and for demodulating diffuse signals |
| 08/18/1999 | CN1226006A Measuring method using spectrum analyzer |
| 08/12/1999 | WO1999026073A8 System for surveillance of spectral signals |
| 08/12/1999 | DE19804840A1 Digital frequency measuring circuit for electrical signals |
| 08/10/1999 | US5936576 Measurement of amplitudes and phases of signals at a high speed and with high reliability |
| 08/03/1999 | US5933793 Outgoing harmonic level evaluator |
| 08/03/1999 | US5932998 System for determining fundamental frequency of an AC signal |
| 07/29/1999 | WO1999038018A1 Method for estimating the frequency of a time signal |
| 07/29/1999 | DE19802193A1 Signal frequency estimation method for target range measurement in radar system |
| 07/27/1999 | US5930294 Frequency measurement circuit |
| 07/27/1999 | US5929360 Method and apparatus of pitch recognition for stringed instruments and storage medium having recorded on it a program of pitch recognition |
| 07/20/1999 | US5926042 Precision clock frequency detector having reduced supply voltage dependence |
| 07/15/1999 | DE19833921A1 Fast Fourier transformation device for measuring response characteristics Input signal frequency spectrum, e.g. a filter in a communication system |
| 07/06/1999 | US5920209 Time counting circuit, sampling circuit, skew adjusting circuit, and logic analyzing circuit |
| 07/01/1999 | WO1999033281A1 Tone detection using discrete fourier transform techniques |
| 06/29/1999 | US5917315 Receiver for spectrum analysis |
| 06/23/1999 | EP0923744A1 Method to determine fundamental and harmonic oscillations of a measured electrical quantity |
| 06/22/1999 | US5915108 Method of accurately controlling an output device in a system |
| 06/17/1999 | DE19847200A1 Continuous period measurement unit of spectrum analyzer |
| 06/15/1999 | US5913158 For measuring the frequency of an applied rf signal |
| 06/15/1999 | US5912929 Method and apparatus for performing carrier detection |
| 06/09/1999 | CN1219301A Method and apparatus for determining the change in frequency of a reference signal |
| 06/02/1999 | EP0919819A1 Procedure and device for evaluating measurement signals |
| 05/27/1999 | WO1999026073A1 System for surveillance of spectral signals |
| 05/26/1999 | EP0917765A2 Swept frequency device test |
| 05/20/1999 | WO1999024839A1 High frequency measuring circuit |
| 05/20/1999 | DE19751218A1 Method to evaluate detected and sampled analogue measurement signals, e.g. for measuring vibration of machine |
| 05/12/1999 | EP0776478B1 Method and device for monitoring power-supply networks |
| 05/11/1999 | CA2182356C Time interval measurement system and a method applied therein |
| 05/06/1999 | WO1999022249A1 Method and measuring unit for verifying the presence of a neutral conductor connection between a four wire system and a measuring unit |
| 05/06/1999 | DE19849524A1 Measurement employing spectral analyzer |
| 04/29/1999 | WO1999021020A1 Electrical signal frequency detector |
| 04/22/1999 | DE19848293A1 Frequency spectrum analyzer with high carrier:noise ratio |
| 04/22/1999 | DE19746278A1 Method for generating spectra with primary number oriented frequency nodes in high frequency electromagnetic fields for locating the effective frequencies in a base spectrum |
| 04/20/1999 | US5896049 Electrical signal frequency detector |
| 04/14/1999 | EP0908735A2 Method for determining the frequency of a signal |
| 04/13/1999 | US5894232 Processor local bus frequency detection circuit |
| 03/30/1999 | US5889398 Process for determining the harmonic oscillations of the fundamental component of an electrical signal |
| 03/18/1999 | WO1998054584A3 Two port handheld vector network analyzer with frequency monitor mode |
| 03/18/1999 | WO1998049567A3 Analog spectrum display for environmental control |
| 03/16/1999 | CA2142509C Complex cepstrum analyzer for speech signals |
| 03/11/1999 | WO1999012046A1 Pointer indicator |
| 03/11/1999 | WO1998040693A3 Time interval measurement system incorporating a linear ramp generation circuit |
| 03/11/1999 | DE19838058A1 Amplitude and phase measuring of RF signals from antennae esp. unwanted signals |
| 03/03/1999 | CN1209551A Frequency measuring device for speed regulator of water turbine |
| 02/25/1999 | WO1999009424A1 Electric arc monitoring systems |
| 02/25/1999 | WO1999009422A1 Electric arc monitoring systems |
| 02/18/1999 | WO1998052286A3 Swept frequency device test |
| 02/09/1999 | US5869959 Spectrum analyzer |
| 02/04/1999 | WO1999005784A1 Measuring method and device for measuring the distortion of a high frequency power amplifier and correction method and device for the automatic correction of a high frequency power amplifier |
| 02/04/1999 | DE19732960A1 Mechanism for analysing alternating voltage or alternating current signals |
| 02/03/1999 | EP0894273A1 Method for the automatic analysis of frequency passband of recorded signals |
| 02/02/1999 | US5867693 Extended resolution phase measurement |
| 02/02/1999 | CA2139068C Abnormality detecting method and apparatus for electric equipment, particularly for a rotating electric machine |
| 01/27/1999 | CN1206260A Self-checking circuit in microwave equipment |
| 01/20/1999 | EP0778937B1 Debris monitoring |
| 01/19/1999 | US5862516 For analyzing a physical waveform into non-harmonic frequency components |
| 01/19/1999 | US5862466 Method and apparatus for automatically balancing a radio-frequency mixer |
| 01/19/1999 | US5862144 Method for correcting a high frequency measurement error |
| 01/14/1999 | WO1999001812A1 Extended resolution phase measurement |
| 01/07/1999 | EP0728260B1 Electronic metering circuit |
| 01/07/1999 | DE19828967A1 Measurement and compensation circuit for an inaccurate clock signal |
| 01/06/1999 | CN2303304Y PLC speed adjuster's frequency measuring arrangement for hydraulic turbine |
| 12/30/1998 | WO1998059252A1 A spectrum analyser |
| 12/23/1998 | CN1202664A Method and apparatus for displaying graticule window data on computer screen |
| 12/17/1998 | WO1998057126A1 Method for displaying statistically occurring events |
| 12/17/1998 | DE19724742A1 Anzeigeverfahren für statistisch auftretende Ereignisse Display method for randomly occurring events |
| 12/16/1998 | EP0884597A2 Method and apparatus for testing frequency dependent electrical circuits |
| 12/16/1998 | EP0883927A1 Method and apparatus for determining the change in frequency of a reference signal |
| 12/10/1998 | DE19825263A1 Period counting circuit |
| 12/08/1998 | US5847559 Spectrum Analyzer |
| 12/03/1998 | WO1998054832A1 Apparatus for converting frequency of an electric signal to voltage |
| 12/03/1998 | WO1998054584A2 Two port handheld vector network analyzer with frequency monitor mode |
| 12/02/1998 | EP0880707A1 Phase- and frequency detector |
| 11/24/1998 | US5841301 Valuable threshold waveform shaping apparatus |
| 11/24/1998 | CA2003463C Method and apparatus for measuring phase accuracy and amplitude profile of a continuous-phase-modulation signal |
| 11/19/1998 | WO1998052286A2 Swept frequency device test |