| Patents for G01R 15 - Details of measuring arrangements of the types provided for in groups , or (13,411) |
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| 09/19/1989 | US4867565 Opto-electronic detection device for remotely detecting a physical magnitude |
| 09/14/1989 | DE3742610C1 Coupling capacitor for a voltage measuring and/or display device |
| 09/13/1989 | EP0331719A1 Light detector and signal processing circuit |
| 09/13/1989 | CN2044351U Multi-functional multitester |
| 09/12/1989 | US4866372 Voltage detector having compensation for polarization change caused by spontaneous birefringence |
| 09/05/1989 | US4864512 Measurement apparatus with plural displays of measured parameter and selectable function thereof |
| 09/05/1989 | US4864226 Meter with synthesized voice readout |
| 09/05/1989 | US4864223 Measuring transformer to measure the current flowing in an electric conductor |
| 09/05/1989 | US4864222 Voltage detector employing electro-optic material having a corner-cube shape |
| 09/05/1989 | US4864220 Voltage detector using electro-optic material and interference of light beams |
| 08/29/1989 | US4862142 Circuit with memory for detecting intermittent changes in resistance, current, voltage, continuity, power interruption, light, and temperature |
| 08/29/1989 | US4861978 Automatic gain setting circuit |
| 08/23/1989 | EP0328938A1 Insulator for use in high-voltage installations |
| 08/22/1989 | US4859936 Method of and apparatus for determining AC calibration errors and apparatus using device with AC calibration errors |
| 08/22/1989 | US4859932 Multi-function tester |
| 08/22/1989 | US4859925 Power transmission systems and means for control thereof |
| 08/17/1989 | DE3803104A1 Circuit arrangement for correcting weak analogue voltages of measurement value transmitters in the case of severe non-linearity |
| 08/16/1989 | EP0328156A1 Digital information transmission system and method |
| 08/16/1989 | EP0327619A1 Electric current sensor using the faraday effect |
| 08/15/1989 | US4857837 Magneto resistive current sensor with improved fidelity |
| 08/15/1989 | US4857836 Mechanical probe for optical measurement of electrical signals |
| 08/08/1989 | US4855671 Electrical power line and substation monitoring apparatus |
| 08/08/1989 | US4855591 Electro-optical voltage detector |
| 08/02/1989 | EP0238524B1 Current transformer for a static electricity counter |
| 08/02/1989 | CN1034430A Sagnac type optical fiber interferometer system |
| 08/01/1989 | US4853619 Digital panel meter |
| 08/01/1989 | CA1258098A1 Apparatus for data transmission from multiple sources on a single channel |
| 08/01/1989 | CA1258097A2 Hinge clamp for securing a sensor module on a power transmission line |
| 08/01/1989 | CA1258096A2 System and apparatus for monitoring and control of a bulk electric power delivery system |
| 08/01/1989 | CA1258095A2 Apparatus for measuring and calculating fourier components of a power line parameter |
| 08/01/1989 | CA1258094C Apparatus for measuring the potential of a transmission line conductor |
| 07/26/1989 | EP0325350A2 Sensing device |
| 07/26/1989 | CN2041819U Intelligent type electric function observation instrument |
| 07/25/1989 | US4852026 Method and apparatus for the evaluation of an angle over an extended range |
| 07/25/1989 | US4851763 Current-measuring device, especially for determining the motor current of a direct-current motor |
| 07/19/1989 | EP0324611A2 Optical unit including electrooptical crystal elements |
| 07/19/1989 | CN1004853B Differential amplifiers with junction field effect transistor resistance |
| 07/18/1989 | US4848910 Sagnac type optical fiber interferometer system |
| 07/11/1989 | US4847780 Current measuring apparatus |
| 07/11/1989 | US4847554 Compensating for DC current |
| 07/11/1989 | US4847518 CMOS voltage divider circuits |
| 07/11/1989 | CA1257334A1 Variable colour digital voltmeter |
| 06/28/1989 | CN2040254U High-voltage capacity indicator for ceramic insulator |
| 06/27/1989 | CA1256496A1 Voltage measuring device of a high voltage metalclad installation |
| 06/20/1989 | US4841237 Current-measuring device |
| 06/20/1989 | US4841235 MRS current sensor |
| 06/20/1989 | US4841234 Voltage detector utilizing an optical probe of electro-optic material |
| 06/14/1989 | EP0320341A1 Measuring apparatus for electric currents using magnetic coupling |
| 06/13/1989 | US4839600 Ammeter for use with A.C. electric power lines |
| 06/13/1989 | US4838653 Liquid crystal display with particular relationship of the capacitances |
| 06/06/1989 | US4837503 Remote measurement of high voltage AC with radar |
| 05/30/1989 | US4835463 Wide dynamic range a.c. current sensor |
| 05/24/1989 | EP0317222A2 Voltage divider circuits |
| 05/24/1989 | EP0316635A1 Optical fibre voltage sensor |
| 05/24/1989 | EP0316619A1 Optical-fibre sensor |
| 05/16/1989 | US4831663 Digital signal transmission/reception using differential polarization modulation/demondulation |
| 05/16/1989 | US4831327 Self-powered electrical measuring system isolated from electrical perturbances |
| 05/10/1989 | EP0315358A2 Method of making a current sensor |
| 05/10/1989 | EP0314850A1 Electrical power line parameter measurement apparatus and systems, including compact, line-mounted modules |
| 05/10/1989 | EP0314849A1 Electrical power line and substation monitoring apparatus and systems |
| 05/09/1989 | US4829298 Electrical power line monitoring systems, including harmonic value measurements and relaying communications |
| 05/09/1989 | US4829239 Multimeter |
| 05/03/1989 | EP0314234A1 Circuit for the detection of an asymmetry in the magnetization current of a magnetic modulator |
| 05/02/1989 | US4827272 Overhead power line clamp and antenna |
| 04/26/1989 | CN2036673U Digital type acceleration transducer |
| 04/25/1989 | US4825392 Dual function DMM display |
| 04/25/1989 | US4825153 Shunt element for measuring current comprising compensation means |
| 04/20/1989 | DE3816957A1 Circuit arrangement with a plurality of shunts for the generation of voltages proportional to currents |
| 04/19/1989 | EP0312050A2 High voltage measuring circuit coupled to the capacitive grounding tap bushing of an HV device |
| 04/18/1989 | US4823075 For measurement |
| 04/18/1989 | US4823074 Low power consumption current transducer |
| 04/18/1989 | US4823022 Apparatus and method for sensing power line conditions |
| 04/11/1989 | US4821138 Monitoring device for overhead power transmission system |
| 04/06/1989 | WO1989003046A1 Fiberoptic sensor |
| 04/04/1989 | US4818990 Monitoring system for power lines and right-of-way using remotely piloted drone |
| 04/04/1989 | US4818947 Apparatus for measuring harmonic distortion in a conductor, and methods of constructing and utilizing same |
| 04/04/1989 | US4818072 Method for remotely detecting an electric field using a liquid crystal device |
| 03/29/1989 | EP0309255A1 Apparatus and process for detecting direct current magnetic flux deflections of an electrical transformer |
| 03/29/1989 | EP0309254A1 Apparatus and process for detecting direct current magnetic flux deflections of an electrical transformer |
| 03/29/1989 | EP0157881B1 Current detecting circuit |
| 03/29/1989 | CN2035091U Electric probe pen |
| 03/28/1989 | US4817032 User programmable data processor |
| 03/22/1989 | EP0307936A1 Multi-channel voltage detector |
| 03/22/1989 | EP0307729A1 Test arrangement for electronic circuits |
| 03/21/1989 | US4814933 Potential indicating device |
| 03/21/1989 | US4814930 Optical zero-phase current and zero phase voltage sensing arrangement |
| 03/21/1989 | US4814700 Field current measurement device |
| 03/21/1989 | US4814604 Opto-electronic method and system for remote detection of physical magnitudes |
| 03/14/1989 | US4812772 Spectrum analyzer and logarithmic amplifier therefor |
| 03/14/1989 | US4812756 Contactless technique for semicondutor wafer testing |
| 03/14/1989 | US4812025 Optical interface for a magneto-optical current transducer |
| 03/14/1989 | CA1251260A1 Apparatus for measuring the temperature and other parameters of an electric power conductor |
| 03/09/1989 | DE3828005A1 Encapsulated magnetoresistive component for floating (potential-free, voltageless) current measurement |
| 03/09/1989 | DE3729196A1 Device for measuring a physical measured quantity which can be represented by an electrical measurement signal |
| 03/09/1989 | DE3728912A1 Measuring device for measuring electrical current intensity |
| 03/09/1989 | DE3728163A1 Measuring device for determining the peak value of high AC voltages |
| 03/07/1989 | US4810989 Transformer system for measuring electrical current |
| 03/01/1989 | EP0304632A2 A contacless technique for semiconductor wafer testing |
| 02/28/1989 | US4808917 Transmission line sensor apparatus operable with near zero current line conditions |
| 02/28/1989 | US4808916 Power supply magnetic shunt for transmission line sensor module |