| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 05/23/1989 | US4833399 DTMF receiver |
| 05/17/1989 | EP0315688A1 Programmable frequency identifier circuit |
| 05/10/1989 | EP0134810B1 Apparatus and method for suppressing side lobe response in a digitally sampled system |
| 05/09/1989 | US4829298 Electrical power line monitoring systems, including harmonic value measurements and relaying communications |
| 05/03/1989 | EP0313765A1 Process and arrangement for determining the instantaneous frequency of a signal |
| 05/03/1989 | CN1004107B Fast response counting ratio counter and use in moisture content detector |
| 04/20/1989 | DE3733966A1 Arrangement for receiving severely disturbed signals of the transmitter DCF-77 |
| 04/19/1989 | EP0312180A1 Apparatus for measuring the distance to an object |
| 04/19/1989 | EP0311825A1 Frequency relay |
| 04/18/1989 | US4823091 Frequency-voltage converter |
| 04/12/1989 | EP0311505A1 Panoramic receiver for radio signal surveillance |
| 04/06/1989 | WO1989003142A1 Measuring process and device for the analysis of disturbances in digital buses |
| 04/05/1989 | EP0309921A1 Procedure for determining the frequency of a sampled symmetrical signal |
| 04/04/1989 | US4818949 Microwave and millimeter-wave spectrum analyzer |
| 04/04/1989 | US4818947 Apparatus for measuring harmonic distortion in a conductor, and methods of constructing and utilizing same |
| 04/04/1989 | CA1252149A1 Portable spectrum analyzer |
| 03/29/1989 | EP0309336A1 Method for measuring the frequency of a periodic signal and frequency meter using such a method |
| 03/29/1989 | EP0309003A2 Surface acoustic wave spectrum analyzer |
| 03/29/1989 | EP0308540A2 Oscillator circuit |
| 03/28/1989 | US4817200 Tracking YIG tuned filter-mixer |
| 03/28/1989 | US4816767 Vector network analyzer with integral processor |
| 03/28/1989 | CA1251859A1 Signal representation generator |
| 03/21/1989 | US4815108 Signal detection apparatus |
| 03/21/1989 | US4815002 Obtaining a selected frequency component in rectangular coordinates from a set of electrical waveforms |
| 03/14/1989 | US4812996 Signal viewing instrumentation control system |
| 03/14/1989 | US4812772 Spectrum analyzer and logarithmic amplifier therefor |
| 03/14/1989 | US4812743 Method and apparatus for detecting a narrowband signal |
| 03/09/1989 | WO1989002080A1 Frequency counting apparatus and method |
| 03/09/1989 | EP0303595A4 Linear position sensor. |
| 03/07/1989 | US4810960 Measuring adjacent channel power |
| 03/07/1989 | US4810947 Digital error detector for IFM receiver |
| 02/28/1989 | US4808917 Transmission line sensor apparatus operable with near zero current line conditions |
| 02/22/1989 | EP0303595A1 Linear position sensor. |
| 02/21/1989 | US4807164 Apparatus for measuring and controlling velocity |
| 02/21/1989 | US4806853 High accuracy frequency modulation waveform tester |
| 02/14/1989 | US4805189 Signal processing system |
| 01/31/1989 | US4802225 Analysis of non-sinusoidal waveforms |
| 01/31/1989 | US4802106 Sweep marker display apparatus for polar coordinate display |
| 01/31/1989 | US4801873 Waveform measuring apparatus with marker zone displaying function |
| 01/31/1989 | US4801872 Guided-wave acoustooptic spectrum analyzer |
| 01/31/1989 | US4801861 Apparatus for measuring frequency modulation noise signals having a frequency response compensation circuit |
| 01/24/1989 | USRE32845 Period and frequency measuring instrument |
| 01/24/1989 | US4800508 Frequency detector |
| 01/24/1989 | US4800507 An electronic circuit capable of providing an output signal |
| 01/17/1989 | US4799020 Instrument for measuring the frequency of an input signal |
| 01/17/1989 | US4799005 Electrical power line parameter measurement apparatus and systems, including compact, line-mounted modules |
| 01/17/1989 | CA1249028A1 Channelized fiber optic receiver |
| 01/10/1989 | US4797735 Distortion surveillance apparatus for television signal transmission system |
| 01/04/1989 | EP0297590A2 Signal analyzer apparatus with automatic frequency measuring function |
| 01/04/1989 | EP0297589A1 Signal analyzer apparatus with analog partial sweep function |
| 01/04/1989 | EP0297418A1 Method for operating a frequency relay and frequency relay for carrying out the method |
| 01/03/1989 | US4796027 Apparatus for data transmission from multiple sources on a single channel |
| 01/03/1989 | US4795970 Electrical apparatus |
| 12/27/1988 | US4794395 Passive interferometric imaging receiver system |
| 12/27/1988 | US4794327 Electrical parameter sensing module for mounting on and removal from an energized high voltage power conductor |
| 12/27/1988 | US4794324 Method and apparatus for characterizing a broad spectrum signal |
| 12/22/1988 | DE3719505A1 Frequency/voltage converter |
| 12/22/1988 | DE3719439A1 Frequency-measuring method for digital tachometers |
| 12/21/1988 | CN88103012A Method of digitally evaluating frequency and phase of signals, and device for implemeting such method |
| 12/15/1988 | WO1988009936A1 Programmable frequency identifier circuit |
| 12/14/1988 | EP0295160A1 Method for numerically evaluating the frequency and phase of signals and device using such a method |
| 12/14/1988 | EP0294938A2 Exponential decay time constant measurement using frequency of offset-phase locked loop: system and method |
| 12/14/1988 | CN88212299U Metering device for parameter of constant voltage source type quartz crystal |
| 12/13/1988 | US4791577 Frequency shift for removing spurious spectral components from spectrum analyzer output |
| 12/13/1988 | US4791360 Method and apparatus for simultaneous instantaneous signal frequency measurement |
| 12/13/1988 | US4790656 Dual homodyne detection system to measure asymmetric spectrum by using angle mirrors |
| 12/13/1988 | CA1246708A1 Transceiver with auto frequency sense |
| 12/01/1988 | DE3716329A1 Method for the acquisition of signals |
| 11/29/1988 | US4788646 Frequency-to-digital value converter |
| 11/23/1988 | EP0146640B1 Period detection circuit |
| 11/22/1988 | US4786861 For determining periodic reference signal at a predetermined time |
| 11/22/1988 | US4786168 Processing a succession of random output burst signals |
| 11/22/1988 | CA1245362A2 Apparatus for, and method of, measuring time delay |
| 11/15/1988 | US4785251 Digital frequency and phase comparator |
| 11/08/1988 | US4783640 Simultaneous-delay correlator apparatus |
| 11/08/1988 | US4783622 Frequency abnormality detecting circuit |
| 11/02/1988 | EP0289289A2 Identification of carrier frequency for pulsed signals |
| 11/02/1988 | EP0289275A1 Sampling of signals using travelling wave modulators |
| 11/02/1988 | EP0289130A2 Radio transmitters |
| 11/01/1988 | US4782284 Frequency analyzer |
| 11/01/1988 | CA1244139A1 Microwave waveform receiver |
| 10/25/1988 | US4780669 Method and arrangement for evaluating a test voltage by means of a bandwidth-limited evaluation circuit |
| 10/25/1988 | US4780667 Magnetostatic wave delay line discriminator with automatic quadrature setting and automatic calibration |
| 10/20/1988 | DE3711534A1 Time dependent signal measurement for microelectronic components - using probe to detect sec. particles from specimen with measurement of pulse response |
| 10/18/1988 | US4779044 Voltage, current and frequency measuring of non-standard waveforms |
| 10/12/1988 | EP0142171B1 Frequency comparing circuit |
| 10/12/1988 | CN86101729B Miniature adjustable inner-vacuum cesium beam tube |
| 10/11/1988 | US4777605 Method and apparatus for identifying the components of a signal |
| 10/11/1988 | US4777433 Spectrum analyzer |
| 10/11/1988 | US4777381 Electrical power line and substation monitoring apparatus and systems |
| 10/05/1988 | EP0284821A1 Signal analyzer having partially scrolling function for display screen |
| 10/05/1988 | CN87206659U Multipurpose timing frequency signal testing instrument |
| 10/04/1988 | US4775244 Method and apparatus for measurement of pulse width of very short pulses |
| 09/28/1988 | EP0284498A1 Frequency counter in particular for counting partly varying frequencies in real time |
| 09/28/1988 | EP0283804A1 Waveform measuring apparatus with marker zone displaying function |
| 09/27/1988 | US4774454 Distortion measuring system method utilizing signal suppression |
| 09/20/1988 | US4772083 Optical fiber interferometer |
| 09/13/1988 | US4771397 Method and apparatus for optical RF amplitude equalization |
| 09/13/1988 | US4771232 Non-interruptive spectrum analyzer for digital modems |
| 09/13/1988 | US4771231 Microwave oscillator with optical readout of resonance phenomena |