| Patents for G01R 15 - Details of measuring arrangements of the types provided for in groups , or (13,411) |
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| 05/15/1991 | CN1051427A Optical fiber arrangement for measuring electric current strength |
| 05/14/1991 | US5016198 Measuring system that allocates a measured value to a measurable variable and measurment transducer thereof |
| 05/14/1991 | US5015945 Current sensor for measuring current in a semiconductor switch |
| 05/14/1991 | US5015944 Current indicating device |
| 05/07/1991 | US5014051 Increased resolution sensor circuit |
| 05/07/1991 | US5014043 Current sensing |
| 05/07/1991 | CA2027818A1 Current measuring method and apparatus therefor |
| 05/01/1991 | CN1012534B Electric current sensing device |
| 04/30/1991 | US5012218 Device for measuring an electric current using a solenoid with regular pitch in the form of a torus |
| 04/30/1991 | US5012183 Electrooptic effect element and electrical signal waveform measuring apparatus using the same |
| 04/30/1991 | US5012182 Electrical measuring device |
| 04/30/1991 | US5012181 Apparatus for and method of internally calibrating an electrical calibrator |
| 04/18/1991 | DE3933222A1 Measuring arrangement using personal computer as indicator - having measuring program and interface for modules measuring electrical values or converting to them |
| 04/17/1991 | EP0422730A2 Circuit arrangement with an adjusting controller |
| 04/16/1991 | US5008913 Measuring and damping resistor arrangement for a high-voltage apparatus |
| 04/16/1991 | US5008631 Pulse analyzer with gain compression |
| 04/16/1991 | US5008611 Method of eliminating the effects of birefringence from the detection of electric current using Faraday rotation |
| 04/16/1991 | US5008525 Current monitoring circuit error compensation |
| 04/09/1991 | US5006846 Power transmission line monitoring system |
| 04/04/1991 | DE3931543A1 Polarimeter arrangement for measuring polarisation plane rotation - has half wave delay plate with electrical rotation of main optical axis |
| 04/03/1991 | EP0420545A2 Electronic watthour meter |
| 04/02/1991 | US5004974 Electric current sensing device |
| 03/26/1991 | US5003298 Variable color digital display for emphasizing position of decimal point |
| 03/26/1991 | CA2021078A1 Electronic watthour meter |
| 03/20/1991 | EP0417963A2 Toothbrush with voltage tester |
| 03/20/1991 | EP0258214B1 Device to control electrical consumers in powered vehicles |
| 03/19/1991 | US5001419 Method of deriving an AC waveform from two phase shifted electrical signals |
| 03/12/1991 | US4999571 Current and/or voltage detector for a distribution system |
| 03/12/1991 | US4999570 Device for making non-contacting measurements of electric fields which are statical and/or varying in time |
| 03/07/1991 | DE3929452A1 Potential-less current measurer suitable for monitoring and protection - comprises magnetic field ring sensor with substrate having central opening for current conductor |
| 03/06/1991 | EP0415439A2 Composite semiconductor device having function for overcurrent detection |
| 02/27/1991 | EP0414236A2 Optical transformer |
| 02/27/1991 | EP0413891A2 Process and appliance forming an input signal for a crossed-coil type indicating instrument |
| 02/27/1991 | CN1049561A Optical fibre apparatus for measuring current intensity |
| 02/26/1991 | US4996475 Electro-optic voltage detector having a transparent electrode |
| 02/20/1991 | EP0205534B1 Optical fibres and methods of manufacture thereof |
| 02/19/1991 | US4994733 Potentiometer for voltage-measuring instrument |
| 02/14/1991 | DE3925685A1 Scanning head for opto-electronic correlation measurement - picks up short EM signals from strip or coplanar measuring lead using material affected by magnetic field |
| 02/12/1991 | US4992970 System for reading or setting printed circuit boards voltage of computer by support processor |
| 02/12/1991 | CA1280166C Power supply magnetic shunt for transmission line sensor module |
| 02/12/1991 | CA1280165C Transmission line sensor apparatus operable with near zero current line conditions |
| 02/07/1991 | WO1991001501A1 Fibre optic arrangement for measuring the strength of an electric current |
| 02/07/1991 | DE3925806A1 Capacitive voltage converter for encapsulated switching systems - has cylindrical intermediate electrode, and requires no additional sealing points |
| 02/06/1991 | EP0411641A2 Low noise pulsed light source using laser diode |
| 01/31/1991 | DE3923804A1 Faseroptische anordnung zum messen der staerke eines elektrischen stromes Fiber optic arrangement for measuring the strength of an electric current |
| 01/30/1991 | EP0410234A2 Method and apparatus for measuring an electric field or an electric voltage |
| 01/29/1991 | CA1279700C System for compensating the return current asymmetry effect on the response of a current measure shunt |
| 01/24/1991 | WO1991001064A1 Data encodement and reading method and apparatus |
| 01/23/1991 | EP0409589A2 Optical current transformer |
| 01/23/1991 | CN2070002U Circuit multi-tester |
| 01/22/1991 | US4987467 Integratable hall element |
| 01/20/1991 | WO1991001500A1 Fibre optic arrangement for measuring the strength of an electric current |
| 01/16/1991 | CN2069564U Universal meter function expander |
| 01/16/1991 | CN1048601A Excess current detecting device |
| 01/16/1991 | CN1048599A Device and method for ac shift and kwh meter piecewise measurement |
| 01/15/1991 | US4984875 Optical component and magnetic-field sensor using superposed single crystal elements having different optical properties |
| 01/09/1991 | EP0406276A1 Monitoring and fault protection of high voltage switchyards. |
| 01/08/1991 | CA1278827C Dual function dmm display |
| 01/02/1991 | EP0405802A2 Electrooptic apparatus for the measurement of ultrashort electrical signals |
| 01/01/1991 | US4982152 Voltage detecting device |
| 01/01/1991 | US4982151 Voltage measuring apparatus |
| 12/27/1990 | EP0403904A1 Device and method for adjusting a measuring device |
| 12/25/1990 | US4980794 Electromagnetic contactor with lightweight wide range current transducer with sintered powdered metal core |
| 12/25/1990 | US4980632 Electrical signal observing device |
| 12/19/1990 | CN1010893B Non-contact voltage phase measuring means |
| 12/18/1990 | US4978910 Electrooptic apparatus for the measurement of ultrashort electrical signals |
| 12/13/1990 | DE3940376C1 Analogue circuit linearising nonlinear measurement signal - has resistance network forming two partial currents proportional to sum of input signals |
| 12/11/1990 | US4977367 Range selector switch for ion chamber instrument |
| 12/11/1990 | US4976517 Optical unit including electrooptical crystal elements |
| 12/05/1990 | EP0400230A1 System for detecting fault location in substation |
| 12/05/1990 | CN2066989U Multifunctional multimeter |
| 12/04/1990 | US4975635 Voltage detector using a sampling type high-speed photodetector |
| 12/04/1990 | CA1277404C Apparatus comprising raman-active optical fiber |
| 12/04/1990 | CA1277371C High voltage apparatus |
| 11/27/1990 | US4973900 Voltage detecting device |
| 11/27/1990 | US4973899 Current sensor and method utilizing multiple layers of thin film magneto-optic material and signal processing to make the output independent of system losses |
| 11/20/1990 | US4972140 Current detection device and core for detection of magnetic flux |
| 11/14/1990 | CN1046981A Current intensity transformer device for measuring variable electric current |
| 11/13/1990 | US4970459 Electronic meter chopper stabilization |
| 11/06/1990 | US4968901 Integrated circuit high frequency input attenuator circuit |
| 11/06/1990 | US4968881 Voltage detector using electro-optic material having anti-reflective coatings |
| 10/30/1990 | US4967145 Active current transformer |
| 10/30/1990 | US4967144 Electrical signal observing device for converting an electrical signal to be measured into an optical intensity waveform |
| 10/24/1990 | EP0393382A1 Device for the measurement of an electric field |
| 10/24/1990 | CN2064510U Portable, digital mega-ohmmeters with multi purposes |
| 10/17/1990 | EP0392945A1 Micromagnetometer with capacitive detection |
| 10/17/1990 | EP0392830A2 Method and apparatus for detecting voltage |
| 10/17/1990 | EP0392439A1 Current transformer for measuring a variable electrical current |
| 10/16/1990 | US4963819 High voltage apparatus |
| 10/16/1990 | US4963818 Current sensor having an element made of amorphous magnetic metal |
| 10/16/1990 | US4962990 For detecting an electric or magnetic field |
| 10/09/1990 | US4962353 Voltage detector |
| 10/04/1990 | WO1990011530A1 Measuring device with auxiliary electrode for a gas-insulated, encased high-voltage installation |
| 10/04/1990 | WO1990011529A1 Apparatus and method for measuring electric current in conditions of high interference |
| 10/04/1990 | DE4010576A1 Applied voltage indicator for current converter - has insulating housing contg. prim. conductor, sec. coil, discharge lamp feeding remote indicator via light conductor |
| 10/03/1990 | EP0390581A2 Instrument for concurrently optically measuring thermal and electric quantities |
| 10/03/1990 | CN2063237U Multipurpose electrometric device |
| 10/03/1990 | CN2063236U Practical multifunction pen of multimeter |
| 10/02/1990 | US4961049 Magnetically-coupled apparatus for measuring electrical current |
| 09/22/1990 | CA2012570A1 Measuring equipment with an auxiliary electrode for a gas-insulated, enclosed high-voltage power station |