| Patents for G01R 15 - Details of measuring arrangements of the types provided for in groups , or (13,411) |
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| 02/21/1989 | US4807035 Signal measurement |
| 02/21/1989 | US4806855 System for rating electric power transmission lines and equipment |
| 02/14/1989 | US4804908 Digital meter |
| 01/31/1989 | US4801937 Line mounted apparatus for remote measurement of power system or environmental parameters beyond line-of-site distanc |
| 01/26/1989 | WO1989000767A1 Light detector and signal processing circuit |
| 01/26/1989 | WO1989000701A1 Electric current sensor using the faraday effect |
| 01/25/1989 | EP0300635A1 Current detecting device using ferromagnetic magnetoresistance element |
| 01/25/1989 | EP0300075A1 Current detector |
| 01/24/1989 | CA1249336A1 Surge detector having distributed line inductance pickup |
| 01/24/1989 | CA1249335A1 System for rating electric power transmission lines and equipment |
| 01/18/1989 | EP0299432A2 A voltage detecting device |
| 01/18/1989 | EP0299427A2 Voltage detector |
| 01/18/1989 | CN2031101U Multi-function test pen |
| 01/17/1989 | US4799005 Electrical power line parameter measurement apparatus and systems, including compact, line-mounted modules |
| 01/17/1989 | CA1249024A1 Internal armature current monitoring in large three- phase generator |
| 01/10/1989 | US4797636 Radio receiver |
| 01/10/1989 | US4797620 High voltage electrostatic surface potential monitoring system using low voltage A.C. feedback |
| 01/10/1989 | US4797607 Method of updating the scale factor of apparatus for measuring an alternating electric current by means of the faraday effect |
| 01/10/1989 | CA1248621A1 Automatic, self-sustaining probe for measuring the work function |
| 01/10/1989 | CA1248587A1 Charge balancing detection circuit |
| 01/10/1989 | CA1248584A1 Shunt arrangement |
| 01/05/1989 | DE3814842A1 Self-adapting filter for measuring devices |
| 01/04/1989 | EP0297562A2 Voltage detector |
| 01/04/1989 | EP0297338A1 Sagnac optical fibre interferometer |
| 01/03/1989 | US4796027 Apparatus for data transmission from multiple sources on a single channel |
| 01/03/1989 | US4795973 On an above ground power line conduit |
| 01/03/1989 | CA1248180A1 Circuit arrangement for detecting current flow in a path in a power supply device |
| 12/27/1988 | US4794383 Variable color digital multimeter |
| 12/27/1988 | US4794330 Method and circuit for measuring and displaying physical values |
| 12/27/1988 | US4794328 Tool for mounting a sensor module on a live power transmission line |
| 12/27/1988 | US4794327 Electrical parameter sensing module for mounting on and removal from an energized high voltage power conductor |
| 12/27/1988 | US4794326 Transducer for current measurements |
| 12/27/1988 | US4794318 Current transducer arrangement for outdoor high-voltage installations |
| 12/22/1988 | DE3719275A1 Arrangement for the interference-free and low-reaction measurement of an electrical quantity |
| 12/21/1988 | EP0295413A1 Mechanical probe for the optical measurement of electrical potentials |
| 12/21/1988 | CN88102088A Method of updating scale factor of apparatus for measuring alternating electric current by means of faraday effect |
| 12/20/1988 | CA1247255A1 Measuring and damping resistor arrangement for a high- voltage apparatus |
| 12/15/1988 | DE3814843A1 Control logic for adaptation to the amplitude of a noise signal |
| 12/14/1988 | EP0294836A2 Voltage detector |
| 12/14/1988 | EP0294817A2 Voltage detecting device |
| 12/14/1988 | EP0294816A2 Voltage detecting device |
| 12/14/1988 | EP0294815A2 Voltage detecting device |
| 12/14/1988 | EP0294636A2 MRS current sensor |
| 12/14/1988 | EP0294635A2 Current sensor for universal application |
| 12/14/1988 | EP0294593A1 Mechanical probe for the optical measurement of electrical signals |
| 12/14/1988 | EP0294590A2 Compensation principle current sensor |
| 12/13/1988 | US4791361 Current sensor for universal application |
| 12/13/1988 | US4790619 Transmitters; glass of germanium, silicon or arsenic oxides with a heavy metal oxide |
| 12/08/1988 | DE3817156A1 Verfahren und geraet zur bestimmung von wechselspannungs(ac)-kalibrierfehlern und geraet mit einer einrichtung zur lieferung von wechselspannungs(ac)-kalibrierfehlern Method and apparatus for the determination of alternating voltage (ac) -kalibrierfehlern and geraet with a device for delivery of alternating voltage (ac) -kalibrierfehlern |
| 12/07/1988 | EP0293922A2 Voltage detector |
| 12/07/1988 | EP0293842A1 Voltage detector |
| 12/07/1988 | EP0293841A1 Voltage detector |
| 12/07/1988 | EP0293840A2 Voltage detector |
| 12/07/1988 | EP0293788A1 Voltage detector |
| 12/07/1988 | CN88103246A Method of and apparatus for determining ac calibration errors and apparatus using device with ac calibration errors |
| 12/06/1988 | CA1246146A1 Dual current transformer current sensing method and sensor |
| 12/01/1988 | DE3715789A1 Electrically isolated current transformer for measuring DC and AC currents |
| 11/30/1988 | EP0292636A1 Current converter for measuring the current flowing in an electric conductor |
| 11/29/1988 | CA1245724A1 Drift compensation technique for a magneto-optic current sensor |
| 11/24/1988 | DE3715528A1 Current monitoring circuit with inductive converters |
| 11/22/1988 | US4786862 Watchdog circuit for transmission line sensor module |
| 11/22/1988 | US4786858 Liquid crystal electrostatic voltmeter |
| 11/17/1988 | EP0290951A2 Current converter circuit |
| 11/17/1988 | EP0290780A1 Electric current measuring appliance using the Faraday effect in a Sagnac interferometer |
| 11/09/1988 | EP0289791A1 Process for updating the scale factor of an electric alternating current measuring appliance using the Faraday effect |
| 11/09/1988 | CN88211020U Multi functional electricity testing pen with large measurement range |
| 11/09/1988 | CN88200320U 信号指示器 Signal Indicator |
| 11/02/1988 | EP0288998A2 Self-powered electrical measuring system isolated from electrical perturbances |
| 11/01/1988 | US4782375 Integratable hall element |
| 11/01/1988 | US4782285 Variable resolution control system |
| 10/27/1988 | DE3712190A1 Electrical transformer |
| 10/26/1988 | CN88102068A Device for measuring electric current by the faraday effect implemented in a sagnac interferometer |
| 10/25/1988 | US4780668 Method and an electronic circuit for measuring very weak signals at high voltage |
| 10/12/1988 | EP0286079A2 Sensing devices utilizing magneto electric transducers |
| 10/12/1988 | CN87102003A Electronic acoustooptic test pencil |
| 10/11/1988 | US4777381 Electrical power line and substation monitoring apparatus and systems |
| 10/05/1988 | EP0285348A1 Optical unit having means for electrically shielding electrooptical element |
| 10/05/1988 | EP0284771A2 Device and method for an optical measurement or/and imaging of electrical potentials |
| 09/29/1988 | DE3707707A1 Measuring transducer |
| 09/28/1988 | EP0284472A1 Current measuring and magnetic core compensating apparatus and method |
| 09/28/1988 | EP0284346A2 Improved optical interface for a magneto-optical current transducer |
| 09/28/1988 | EP0284214A1 Electric current measurement |
| 09/14/1988 | CN87216216U Circuit for expanding function of multimeter |
| 09/13/1988 | US4770535 For remotely sensing environmental effects |
| 09/07/1988 | CN88101525A Electric current measurement |
| 09/01/1988 | DE3705450A1 Current transformer for measuring rectangular waveform currents using the compensation principle |
| 08/31/1988 | EP0280444A1 Electromagnetic contactor with lightweight wide range current transducer |
| 08/24/1988 | EP0279596A1 Electromagnetic contactor with lightweight wide range current transducer with sintered powdered metal core |
| 08/11/1988 | DE3702735A1 Capacitive voltage divider for high-voltage cables |
| 08/10/1988 | CN87207519U Multi-function magnetoelectric test pencil |
| 08/09/1988 | US4763078 Sensor for electrostatic voltmeter |
| 08/09/1988 | US4763068 Method, circuit and apparatus for the elimination of the d.c. voltage components of a capacitive a.c. voltage divider |
| 08/03/1988 | EP0276280A1 Method for remotely detecting an electric field. |
| 08/02/1988 | US4761606 Auto-ranging in electric watthour meter |
| 08/02/1988 | US4761605 Current sensor |
| 07/20/1988 | EP0274529A1 Liquid crystal display. |
| 07/19/1988 | US4758962 Electrical power line and substation monitoring apparatus and systems |
| 07/19/1988 | US4758060 Integrated optical high voltage sensor |
| 07/12/1988 | US4757263 Insulation power factor alarm monitor |
| 07/05/1988 | US4755805 Current sensing alarm arrangement for monitoring the presence of high voltage |