| Patents for G01R 15 - Details of measuring arrangements of the types provided for in groups , or (13,411) |
|---|
| 09/19/1990 | CN2062454U Multi-functional measuring device |
| 09/18/1990 | US4958124 Multi-channel voltage detector |
| 09/12/1990 | EP0386272A1 Current sensor circuit |
| 09/11/1990 | US4956607 Method and apparatus for optically measuring electric current and/or magnetic field |
| 09/04/1990 | US4954782 Self-checking ohmmeter that checks for contact resistance of its probes |
| 09/04/1990 | US4953981 Lateral-shearing electro-optic field sensor |
| 08/29/1990 | CN2061298U 静电动态电位测量装置 Static dynamic potential measuring device |
| 08/29/1990 | CN2061294U Multifunctional test pencil |
| 08/28/1990 | US4952853 Method and apparatus for sensing direct current of one polarity in a conductor and electronically commutated motor control responsive to sensed motor current |
| 08/23/1990 | DE3905060A1 Einrichtung zum beruehrungslosen messen eines gleichstroms Means for beruehrungslosen measure of a direct current |
| 08/22/1990 | CN1009311B Method for the elimination of the dc voltage component of a capacitive ac voltage divider |
| 08/21/1990 | US4950979 Insulating member, functioning as a voltage divider in a high voltage system |
| 08/16/1990 | EP0382274A1 High tension-measuring device |
| 08/14/1990 | US4949290 Method and apparatus for defining test sequences for a signal measurement system |
| 08/14/1990 | US4949038 Optical fiber having a helical core for sensing a magnetic field |
| 08/14/1990 | US4948255 Optical sensing device |
| 08/07/1990 | US4947108 Electric current sensing device |
| 08/07/1990 | US4947107 Magneto-optic current sensor |
| 07/31/1990 | US4944571 Optical fibers |
| 07/25/1990 | CN1044166A Method for instantaneously measuring a.c. quantity of electricity and device thereof |
| 07/24/1990 | US4943765 Circuit for measuring voltages in a three-phase installation, in particular an installation of the metalclad type |
| 07/19/1990 | DE4000411A1 Capacitive voltage converter with voltage divider - has resonance choke coil and intermediate converter connected at divider point |
| 07/13/1990 | CA2007665A1 Capacitive voltage transformer |
| 07/10/1990 | US4940328 For sensing a property of an environment |
| 07/10/1990 | CA1271525A1 Device for compensating the response delay of a measure shunt |
| 07/05/1990 | DE3843280A1 Method and device for electrical current measurement |
| 07/04/1990 | CN1043571A Current sensing |
| 07/03/1990 | US4939451 Wide dynamic range a.c. current sensor |
| 07/03/1990 | US4939449 Electric current sensing device of the magnetic field compensation type |
| 07/03/1990 | US4939448 Electric current sensing device of the magnetic field compensationtype |
| 07/03/1990 | US4939447 Fiber-optic voltage sensor |
| 06/27/1990 | EP0375173A1 Electronic meter chopper stabilization |
| 06/26/1990 | US4937521 Current detecting device using ferromagnetic magnetoresistance element |
| 06/21/1990 | DE3942165A1 Fehlererfassungseinrichtung fuer elektrische schaltungen Error detection means for electrical circuits |
| 06/21/1990 | DE3942164A1 Fehlererfassungeinrichtung fuer elektrische schaltungen Error detection means for electrical circuits |
| 06/20/1990 | EP0373982A1 Measuring device for various electric quantities |
| 06/20/1990 | CN2058495U Multipurpose test pencil |
| 06/19/1990 | US4935693 Line secured current and voltage sensing apparatus |
| 06/14/1990 | WO1990006519A1 Apparatus and method for current sensing |
| 06/12/1990 | US4933631 Digital AC meter |
| 06/12/1990 | US4933630 System for measuring phase currents in a 3-phase installation |
| 06/12/1990 | US4933629 Method and apparatus for optically measuring electric and magnetic quantities having an optical sensing head exhibiting the Pockel's and Faraday effects |
| 06/12/1990 | US4933628 Voltage detecting device |
| 06/05/1990 | US4931737 Circuit for measuring the capacity of a battery |
| 06/02/1990 | CA2004333A1 Electronic meter chopper stabilization |
| 05/29/1990 | US4929830 Fiber-optic electric field sensor with piezoelectric body sensor |
| 05/23/1990 | EP0369868A1 Apparatus for the simultaneous measurement of at least two electrical variables |
| 05/23/1990 | DE3921596C1 Multi-phase e.g. three-phase supply network voltage feedback detection - feeding two counter phase Ac voltages, via non-linear semiconductors in separate charge paths of rectifier, to earth potential node |
| 05/22/1990 | US4928058 Electro-optic signal measurement |
| 05/22/1990 | US4928057 High speed D.C. non-contacting electrostatic voltage follower |
| 05/17/1990 | WO1990005322A1 Optical sensing apparatus and method |
| 05/16/1990 | EP0367807A1 Harmonimeter, and methods of utilizing and constructing same |
| 05/16/1990 | CN1042240A System for measuring phase currents in 3-phase installation |
| 05/15/1990 | US4926360 Electronic gage amplifier and display |
| 05/15/1990 | US4926116 Wide band large dynamic range current sensor and method of current detection using same |
| 05/15/1990 | US4926043 Apparatus and method for optical measuring and imaging of electrical potentials |
| 05/08/1990 | US4922606 Method of making a current sensor |
| 05/08/1990 | CA1268819A1 Mutual inductor current sensor |
| 05/02/1990 | EP0366360A1 Proving apparatus & method for high voltage detectors |
| 05/02/1990 | CN2056760U Electric detecting multi-purpose switching over machine |
| 05/01/1990 | US4922186 Voltage detector |
| 04/25/1990 | EP0365216A1 Current sensor |
| 04/24/1990 | US4920311 User selection of meter ballistics |
| 04/24/1990 | US4920310 Voltage detector |
| 04/24/1990 | US4919217 Optical fiber-containing insulators and producing process thereof |
| 04/18/1990 | EP0363830A1 Electrical installation with a galvanic signal-carrying conductor, and an interference indicator therefor |
| 04/17/1990 | US4918371 Fiber optic magnetometers for multiple order gradiometers |
| 04/11/1990 | EP0362542A1 Method and device for the evaluation of signals having a periodic content or of pulse trains |
| 04/10/1990 | US4916402 Apparatus for detecting direct current magnetic flux deflections of an electrical transformer |
| 04/10/1990 | US4916392 Contactless current control sensor in apparatus for magnetoelectric crack detection |
| 04/10/1990 | US4916387 Optical system for a Faraday effect current sensor |
| 04/05/1990 | WO1990003581A1 Current sensor circuit |
| 04/04/1990 | EP0361832A2 Electro-optical differential voltage method and apparatus in a measuring system for phase shifted signals |
| 04/03/1990 | US4914385 Protective devices |
| 04/03/1990 | US4914383 Non-contact ammeter |
| 04/03/1990 | US4914382 High voltage measuring circuit coupled to the capacitive grounding tap bushing of an HV device |
| 04/03/1990 | US4914381 Direct-coupled fluxgate current sensor |
| 03/28/1990 | EP0360592A1 Apparatus for detecting fault on power transmission lines |
| 03/28/1990 | EP0360574A1 Current sensor having an element made of amorphous magnetic metal |
| 03/28/1990 | EP0359886A1 Device for measuring high currents |
| 03/27/1990 | US4912396 Circuit for the detection of an asymmetry in the magnetization current of a magnetic modulator |
| 03/27/1990 | CA1267193A1 Transit system third rail warning signal |
| 03/21/1990 | EP0359666A1 Fibre-optical measuring system, gyrometer, navigation and stabilization system |
| 03/21/1990 | CN2054907U 试电笔 Test pencil |
| 03/21/1990 | CN1040684A Monitoring and fault protection of high voltage switch yards |
| 03/21/1990 | CN1007312B Internal armature current monitoring in large three-phase generator |
| 03/20/1990 | US4910458 Electro-optic sampling system with dedicated electro-optic crystal and removable sample carrier |
| 03/20/1990 | US4910454 System for electrical signal sampling with ultrashort optical pulses |
| 03/14/1990 | EP0358258A2 Optical sensing arrangement |
| 03/14/1990 | EP0358145A1 Screened tension-measuring appliance for a triphase installation |
| 03/14/1990 | CN2054593U Low input capacitance voltage following unit |
| 03/14/1990 | CN1040441A Optical fiber-containing insulators and producing process thereof |
| 03/13/1990 | US4908568 Mechanical probe for optical measurement of electrical potentials |
| 03/13/1990 | CA1266704A1 Variable color digital multimeter |
| 03/07/1990 | EP0356696A1 Device for measuring the currents of phases in a three-phase system |
| 03/07/1990 | EP0356670A1 Fibre-optical current sensor |
| 03/06/1990 | US4906922 Voltage mapping device having fast time resolution |
| 02/28/1990 | EP0356273A1 Main and secondary optical sensor device |
| 02/28/1990 | EP0356171A2 Direct-coupled fluxgate current sensor and sensing method using the same |
| 02/28/1990 | EP0355958A2 Optical fiber-containing insulators, and producing process thereof |