| Patents for G01R 29 - Arrangements for measuring or indicating electric quantities not covered by groups (11,937) |
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| 04/03/1991 | EP0420345A2 Influence probe |
| 04/03/1991 | CN1050444A Multifunctional phase-sequence meter |
| 04/03/1991 | CN1012284B System and method for identifying phase conductor |
| 04/02/1991 | US5004985 Method and apparatus for testing the response of a stress wave sensor |
| 03/26/1991 | US5003256 Clock skew measurement technique |
| 03/19/1991 | US5001724 Method and apparatus for measuring phase accuracy and amplitude profile of a continuous-phase-modulated signal |
| 03/19/1991 | US5001494 Compact antenna range |
| 03/12/1991 | US4999570 Device for making non-contacting measurements of electric fields which are statical and/or varying in time |
| 03/12/1991 | CA1281383C Random signal isolation circuit |
| 03/05/1991 | US4998266 Device for producing x-ray images by means of a photoconductor |
| 03/05/1991 | US4998112 Method for measuring large antenna arrays |
| 03/05/1991 | US4998071 Noise parameter test method and apparatus |
| 02/28/1991 | DE3927885A1 Read=out head for imaging and recording system - has double refractive elements in light path which form set with light inlet and outlet face, and beam divider |
| 02/26/1991 | US4996488 Measuring and limiting EMI with a selectable mode reflection network |
| 02/21/1991 | DE3927228A1 Determining waveforms using stable-positionable antenna part - having emitted and/or reflected wavefronts deflected and processed and evaluated in receiver coupled to test antenna |
| 02/19/1991 | US4994650 Electric field detector for a heatable windshield |
| 02/06/1991 | CN1049057A Method for rapid measurement of phase resistance of delta winding |
| 02/05/1991 | US4990925 Interferometric radiometer |
| 02/05/1991 | US4990860 Apparatus for measuring the number of turns of a toroidal coil |
| 01/31/1991 | DE3925247A1 Defined field strengths absorber - uses two coupled metal cones with internal conductor and defined EM field |
| 01/24/1991 | DE3924370A1 Measuring time span of oscillator in random sampling mode - using time measuring circuit receiving gate signal for time to be measured and gate signals of known duration |
| 01/17/1991 | DE4015912A1 Photoelectric switch emitting light pulse signal |
| 01/16/1991 | EP0408408A1 Collector of electromagnetic radiation |
| 01/16/1991 | CN2069563U 起动电流测试装置 Starting current test device |
| 01/16/1991 | CN1048595A Kind of directly conversion circuit for logarithmic analogue-digital |
| 01/09/1991 | CN2069120U Arrangments for measuring electric quantities |
| 01/08/1991 | US4984254 Frequency counter |
| 01/08/1991 | US4983923 Frictional electrostatic voltage measuring equipment |
| 01/08/1991 | US4983858 Level determining circuit generating output signal at first or second output terminal according to level of input signal |
| 01/02/1991 | EP0405802A2 Electrooptic apparatus for the measurement of ultrashort electrical signals |
| 01/02/1991 | CN2068689U Multifunction electrostatic meter |
| 01/02/1991 | CN1011082B Measuring system for ultra-fast changed electric field |
| 01/01/1991 | US4982109 Circuit and method for measuring the duration of a selected pulse in a pulse train |
| 12/29/1990 | WO1991000525A1 Electric field detection system |
| 12/29/1990 | CA2032165A1 Electric field detection system |
| 12/20/1990 | DE3913445A1 Circuit determining time sequence of incoming signal pulses - has flank controlled flip=flop with clock pulse input, data input and output |
| 12/18/1990 | US4978962 For measuring the brightness temperature |
| 12/18/1990 | US4978910 Electrooptic apparatus for the measurement of ultrashort electrical signals |
| 12/12/1990 | CN2067412U Multipurpose electronic tester |
| 12/11/1990 | US4977376 Method for disturbance reduction in measurement systems for analysis of emission or transmission processes |
| 12/11/1990 | US4977365 Instantaneous frequency measurement (IFM) receiver to measure frequency and angle of arrival (AOA) of multiple signals |
| 12/11/1990 | CA1277709C Wave-leakage measuring apparatus and measuring method |
| 12/05/1990 | EP0400099A1 Method for determining earth station parameters, such as noise margin, with attenuation pads |
| 12/05/1990 | CN2066991U Voltage drop recorder |
| 12/04/1990 | US4975686 Process and apparatus for detecting pulses due to electrostatic discharges from furniture or human beings |
| 12/04/1990 | US4975634 Jitter measurement device |
| 12/04/1990 | US4975536 Reacting with copper hydride or metal hydride reducing agent and copper compound, silylating |
| 12/03/1990 | WO1990015068A1 Conversion of delta16-steroid to a delta17(20)-20-silyl ether |
| 11/27/1990 | US4974234 Method of and circuit for the measurement of jitter modulation of zero-related digital signals |
| 11/27/1990 | US4973911 Apparatus for electromagnetic compatibility testing |
| 11/27/1990 | US4973910 Surface potential analyzer |
| 11/27/1990 | CA1277032C Noninterruptive noise measurement |
| 11/22/1990 | EP0398780A1 Measuring chain for determing the characteristic of additional phase noise of a component near a carrier frequency |
| 11/21/1990 | CN2066146U Multi-functional phase-sequence test pencil |
| 11/21/1990 | CN2066142U Pointer freeze voltmeter for testing transformer |
| 11/20/1990 | US4972412 Delay time checking arrangement |
| 11/20/1990 | US4972191 Wave absorber, and an anechoic chamber using the same |
| 11/16/1990 | WO1990014600A1 E-field detector and annunciator |
| 11/16/1990 | CA2032491A1 E-field detector and annunciator |
| 11/14/1990 | EP0397535A2 Modem |
| 11/13/1990 | US4970679 Pulse input apparatus |
| 11/13/1990 | US4970455 Device for measuring electromagnetic wave leakage |
| 11/13/1990 | CA1276320C System for measuring the charge distribution on a photoreceptor surface |
| 11/07/1990 | EP0395863A2 Aperture synthesized radiometer using digital beamforming techniques |
| 11/07/1990 | CN2065327U Transformation ratio measuring bridge |
| 11/06/1990 | US4968983 For measuring electromagnetic field characteristics of a tested object |
| 11/06/1990 | US4968908 Method and apparatus for wide band phase modulation |
| 10/24/1990 | EP0393828A2 A method and apparatus for testing the response of a stress wave sensor |
| 10/24/1990 | EP0393382A1 Device for the measurement of an electric field |
| 10/24/1990 | CN2064512U Positive and negative charges' displays |
| 10/18/1990 | WO1990012327A1 Method and means for near field antenna monitoring |
| 10/17/1990 | CN2064066U Split-phase voltage-lossing recorder |
| 10/13/1990 | CA2013721A1 Method and means for near field antenna monitoring |
| 10/10/1990 | EP0391564A2 Noise parameter determination method |
| 10/09/1990 | US4962358 Integrity monitoring method and system for shielded enclosures having a fiber optic cable for bidirectional communications between a receiver and transmitter thereof |
| 10/09/1990 | US4962353 Voltage detector |
| 10/04/1990 | DE3910508A1 Method and device for measuring a time period |
| 10/03/1990 | EP0390651A2 Fiberoptic techniques for measuring the magnitude of local microwave fields and power |
| 10/03/1990 | EP0390453A2 Circuitry and method for providing an output signal indicative of the time delay between two asynchronous clock signals |
| 10/02/1990 | US4961209 System for measuring the charge distribution on a photoreceptor surface |
| 09/26/1990 | EP0388537A2 Method and device for determining a measured value indicating the degree to which data signals are reproducible outside a digital information processing system |
| 09/20/1990 | DE3908590A1 Device for measuring, monitoring and evaluating electrostatic parameters during the charging-up and/or discharging of bodies |
| 09/12/1990 | CN2062071U Electronic wristwatch with sound-light alarming device |
| 09/12/1990 | CN2062057U Multi-function phase-sequence testing pen |
| 09/11/1990 | CA1273999A1 Apparatus and method for testing contact interruptions of circuit interconnection devices |
| 09/05/1990 | EP0385101A2 Line noise signal measurement system |
| 09/05/1990 | CN1009493B Radiation detection imaging system with frequency spreading collinear array |
| 09/04/1990 | USH821 Means and method for performing shielding effectiveness measurements using mode-stirred chambers |
| 08/29/1990 | CN2061298U 静电动态电位测量装置 Static dynamic potential measuring device |
| 08/29/1990 | CN2061297U Power frequency phase-sequence meter |
| 08/23/1990 | WO1990009582A1 Process and device for monitoring the occurrence or spreading of fractures or cracks in materials, workpieces, component parts, structures or flying objects, in particular in earthquake-prone regions or movement of strata during tunnelling |
| 08/23/1990 | DE4004171A1 Tear detector for mechanical loading test sample - uses capacitive sensor coupled via impedance converter to electronic evaluation circuit |
| 08/21/1990 | US4951282 Method and apparatus for measuring the quality of digital signals |
| 08/21/1990 | US4950978 Atmospheric potential measurement device |
| 08/21/1990 | US4950977 Method of measuring mobile ion concentration in semiconductor devices |
| 08/21/1990 | CA1273060A1 Device for the emi testing of electronic systems |
| 08/16/1990 | DE4004170A1 Arrangement to detect material failure in structural materials - having probe elements, differential amplifier computer and recording or warning signal unit |
| 08/14/1990 | CA1272761A1 Method and apparatus for measuring a quantity of particles deposited on a metal body to be coated with powder |
| 08/07/1990 | US4947468 Bypass tandem chamber charge density monitor |
| 08/04/1990 | WO1990008952A1 Sensor |