| Patents for G01R 15 - Details of measuring arrangements of the types provided for in groups , or (13,411) |
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| 02/28/1990 | EP0355498A1 Insulating device, especially as a bearing insulator in a voltage divider for high-voltage plants |
| 02/28/1990 | CN1007017B Voltage measuring device of a high voltage metalclad installation |
| 02/27/1990 | US4904996 Line-mounted, movable, power line monitoring system |
| 02/27/1990 | US4904945 Apparatus and process for detecting direct current magnetic flux deflections in an electrical transformer employing Fourier analysis |
| 02/27/1990 | US4904932 Circuit condition monitor with integrally molded test point socket and capacitive coupling |
| 02/27/1990 | US4904931 Electro-optical voltage measuring system incorporating a method and apparatus to derive the measured voltage waveform from two phase shifted electrical signals |
| 02/27/1990 | US4904925 Apparatus for recovering an alternating variable of a controlled semiconductor |
| 02/27/1990 | CA1266300A1 Watchdog circuit for transmission line sensor module |
| 02/22/1990 | WO1990001704A1 System for measuring partial discharges |
| 02/22/1990 | DE3828016A1 Insulating part, preferably as support insulator in a voltage divider for high voltage installations |
| 02/22/1990 | DE3827758A1 Device for monitoring a predetermined current strength in at least one electrical conductor |
| 02/20/1990 | US4902978 Opto-isolation system and method of use |
| 02/20/1990 | US4902960 Voltage input for harmonimeter, and methods of constructing and utilizing same |
| 02/14/1990 | CN2052904U Multi-function integrated circuit universal meter |
| 02/14/1990 | CN1039660A Circuit for measuring capacity of battery |
| 02/14/1990 | CN1039659A Abnormality diagnosing system and method for high voltage power apparatus |
| 02/14/1990 | CN1039658A Electric current sensing device |
| 02/13/1990 | US4901010 Current-measuring device |
| 02/13/1990 | US4901008 Circuit arrangement for testing the correct functioning of circuit(s) |
| 02/13/1990 | CA1265844A1 Line mounted apparatus for measuring line potential |
| 02/08/1990 | WO1990001170A1 Device with main and secondary optical sensors |
| 02/07/1990 | EP0354079A1 Current transformer for continuous, alternative or pulsed current |
| 02/06/1990 | US4899103 Current meter |
| 02/06/1990 | CA1265583A1 Apparatus for measuring low currents with high dynamics |
| 02/06/1990 | CA1265582A1 Current sensing alarm arrangement for monitoring the presence of high voltage |
| 01/31/1990 | EP0353057A2 Optical component and magnetic-field sensor using superposed single crystal elements having different optical properties |
| 01/30/1990 | US4897599 Signal processing device with a level adapter circuit |
| 01/30/1990 | US4897541 Sensors for detecting electromagnetic parameters utilizing resonating elements |
| 01/30/1990 | CA1265197A1 Potential indicating device |
| 01/24/1990 | EP0352194A1 Methods, apparatus and media for recording information |
| 01/23/1990 | CA1264809A1 Voltage loss detector |
| 01/17/1990 | EP0351291A1 Measuring appliance for an electric quantity |
| 01/17/1990 | EP0351171A2 Method and apparatus for optically measuring electric and magnetic quantities |
| 01/17/1990 | EP0350662A2 Process and appliance for determining pulse currents in lightning conductors or similar devices |
| 01/16/1990 | US4894610 Current-transformer arrangement for an electrostatic meter |
| 01/16/1990 | US4894609 For a three-phase line |
| 01/16/1990 | US4894608 Electric current sensor using the faraday effect |
| 01/16/1990 | US4894607 Surface potential detecting apparatus |
| 01/11/1990 | WO1990000256A1 Magneto-optic current sensor |
| 01/11/1990 | EP0276280A4 Method for remotely detecting an electric field. |
| 01/09/1990 | US4893073 Electric circuit board current sensor |
| 01/03/1990 | CN2050614U Interval voltmeter |
| 01/02/1990 | US4891580 Electro-optic measurements of voltage waveforms on electrical conductors |
| 01/02/1990 | US4891579 Voltage detector |
| 12/28/1989 | WO1989012831A1 Electrooptical effect element and device for measuring electric signal waveforms using said element |
| 12/28/1989 | EP0274529A4 Liquid crystal display. |
| 12/27/1989 | CN2050173U Electric breakdown diagnosis instrument |
| 12/26/1989 | US4890236 Method and apparatus for aiding manual instrument settings by displaying estimates of future measurement results |
| 12/20/1989 | EP0346970A1 Circuit for measuring capacity of battery |
| 12/13/1989 | EP0345759A2 A magnetic field measurement apparatus |
| 12/13/1989 | CN2049362U High voltage presence displaying device |
| 12/12/1989 | US4887029 Mutual inductance current transducer, method of making and electric energy meter incorporating same |
| 12/12/1989 | US4887026 Voltage detector for detecting a voltage developing in a selected area of an object |
| 12/12/1989 | US4886980 Transmission line sensor apparatus operable with near zero current line conditions |
| 12/06/1989 | EP0345142A2 Sensors for detecting electromagnetic parameters utilizing vibrating elements |
| 12/06/1989 | EP0345011A1 Electrical signal observing device |
| 12/06/1989 | EP0344986A2 Electrical signal observing device |
| 12/05/1989 | US4885532 Apparatus for testing multiphase outlet with visual indication of phase energization, phase rotation, and supply voltage |
| 12/05/1989 | CA1263705A1 Rf antenna for transmission line sensor |
| 11/29/1989 | EP0343392A2 Arrangement for displaying a variable quantity from a driven semiconductor |
| 11/29/1989 | CN1005931B Measuring transformer for measuring current flowing in electrical conductor |
| 11/23/1989 | EP0342597A2 Abnormality system for a high voltage power supply apparatus |
| 11/21/1989 | US4882538 Device for detecting current flowing in an electric wire |
| 11/14/1989 | US4881028 Fault detector |
| 11/08/1989 | CN2047391U Plug-in device for testing kilowatt-hour meter |
| 11/08/1989 | CN2047386U Optical fiber voltage sensing head with high-stability |
| 11/08/1989 | CN2047384U Multi-functional detecting meter for car electrical equipment |
| 11/08/1989 | CN2047383U Rectification voltage division type ac-dc high-voltage measuring device |
| 11/08/1989 | CN1037038A High resolution method of extending the range of three and a half digits meter |
| 11/02/1989 | EP0339189A1 Current transformer for electric energy meter and method of making the transformer |
| 11/02/1989 | DE3813546A1 Oscilloscope |
| 11/02/1989 | DE3813545A1 Measuring range switch for the automatic setting of measuring ranges |
| 11/01/1989 | CN2047028U Avometer capable of surveying scr |
| 11/01/1989 | CN2047025U Porcelain type voltage tapping apparatus |
| 10/31/1989 | US4878185 Digital measuring instrument |
| 10/31/1989 | US4878017 High speed D.C. non-contacting electrostatic voltage follower |
| 10/31/1989 | US4878016 Soldering iron testing method and apparatus |
| 10/25/1989 | EP0338542A1 A current and/or voltage detector for a distribution system |
| 10/24/1989 | US4876515 Self-checking ohmmeter that checks for contact resistance of its probes |
| 10/24/1989 | US4876503 Method of measuring the intensity of a DC current and a device implementing this method |
| 10/24/1989 | US4876502 Wide dynamic range current measuring apparatus |
| 10/19/1989 | WO1989009926A1 Electronic gage amplifier and display |
| 10/18/1989 | EP0337266A2 Method for transmitting measurement values between a supporting insulator and an evaluating apparatus |
| 10/18/1989 | EP0337265A1 Correcting process for voltage measuring in a three-phase system |
| 10/18/1989 | CN2046222U Universal digital electronic test device |
| 10/18/1989 | CN2046221U Ultrasonic remote control digital microammeter |
| 10/11/1989 | EP0336656A2 Method and apparatus for defining test sequences for a signal measurement system |
| 10/10/1989 | US4873485 Electro-optic signal measurement |
| 10/10/1989 | US4873484 Extended range composite head power sensor with three circuit branches having a common node |
| 10/05/1989 | WO1989009411A1 Monitoring and fault protection of high voltage switchyards |
| 10/04/1989 | EP0335729A2 Method and apparatus for aiding manual instrument settings by displaying estimates of future measurement results |
| 10/04/1989 | EP0335511A1 Active current transformer |
| 09/28/1989 | DE3826457A1 Arrangement for measuring pulse-shaped high currents |
| 09/27/1989 | EP0333882A1 Fiberoptic sensor |
| 09/26/1989 | US4870343 High voltage detector |
| 09/26/1989 | CA1261923A1 Variable color digital multimeter |
| 09/26/1989 | CA1260087A1 Current-transformer arrangement for a static electricity meter |
| 09/21/1989 | WO1989008849A1 Harmonimeter, and methods of utilizing and constructing same |
| 09/21/1989 | DE3808060A1 Pulse counter circuit for a Geiger-Müller counter |
| 09/20/1989 | CN2044734U Capacitance tester for universal meter |