| Patents for G01R 27 - Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom (22,286) |
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| 03/20/1991 | EP0417708A2 Impedance and transfer characteristic measuring apparatus |
| 03/19/1991 | US5001435 Lubrication film thickness measuring system and method |
| 03/19/1991 | US5001433 Apparatus and method for measuring electric characteristics of material |
| 03/19/1991 | CA1281792C Linear position sensor |
| 03/13/1991 | CN1012009B Bridge resistance measuring device for auget |
| 03/12/1991 | US4999582 Biosensor electrode excitation circuit |
| 03/07/1991 | WO1991002985A1 Measurement circuit and its use, in particular with inductive position sensors |
| 03/05/1991 | CA1281073C Multi-frequency capacitance sensor |
| 02/28/1991 | DE3927833A1 Messschaltung und anwendung derselben, insbesondere mit induktiven weggebern Measuring circuit and application thereof, in particular with inductive displacement |
| 02/27/1991 | CN2072229U Intelligent standard pt resistor detector |
| 02/26/1991 | US4996491 Measurement of the position of an elongated element |
| 02/26/1991 | US4996489 Laboratory technique for measuring complex dielectric constant of rock core samples |
| 02/19/1991 | WO1991002598A1 Paint conductivity measurement system |
| 02/19/1991 | CA2038955A1 Paint conductivity measurement system |
| 02/13/1991 | EP0412357A2 Lightwave test set for an rf network analyzer system |
| 02/12/1991 | US4992741 Capacitive sensor and metal detector with a display for quantitatively displaying signals resulting from concealed objects |
| 02/12/1991 | US4992740 Apparatus which uses a simulated inductor in the measurement of an electrical parameter of a device under test |
| 02/06/1991 | EP0411689A1 Method for continuously monitoring the soundness of the protective covering on underground metal structures, and devices for its implementation |
| 02/06/1991 | CN1049057A Method for rapid measurement of phase resistance of delta winding |
| 02/05/1991 | US4991128 Apparatus and methods for spectral analysis of electrical materials, components and devices |
| 02/05/1991 | US4990897 Method and apparatus for detecting and recognizing impacts by measuring impedance variation |
| 02/05/1991 | US4990859 Process and apparatus for determining the impedance of the discharge in a plasma reactor system comprising a tuning box and application to the regulation of the impedance or the ionic current in such reactor |
| 02/02/1991 | CA2021859A1 Method for continuously monitoring the soundness of the protective covering on underground metal structures, and devices for its implementation |
| 01/30/1991 | CN2070450U High-voltage ac electric bridge power source |
| 01/29/1991 | US4989154 Method of measuring resistivity, and apparatus therefor |
| 01/29/1991 | US4988943 VSWR meter arrangement with a display output having a linear scale |
| 01/29/1991 | CA1279697C Tester for terminal post resistance for an energy storage element connected in an electrical circuit |
| 01/23/1991 | EP0408841A2 Circuit device for automatically tuning a matching network |
| 01/22/1991 | US4987389 Lockproof low level oscillator using digital components |
| 01/22/1991 | US4987372 Potentiometer state sensing circuit |
| 01/16/1991 | EP0407639A1 Method of preadjusting electronic circuits |
| 01/16/1991 | CN2069567U Liquid dielectric resistivity/resistance tester |
| 01/09/1991 | EP0407186A2 Work station monitor |
| 01/02/1991 | EP0405593A2 High frequency signal measuring equipment with cabled detecting and signal companding |
| 01/02/1991 | EP0405587A1 Planar interdigitated dielectric sensor |
| 01/02/1991 | CA1278609C Multi-channel modulated numerical frequency synthesizer |
| 01/01/1991 | US4982164 Method of calibrating a network analyzer |
| 12/27/1990 | WO1990015998A1 Object detection and analysis with transmission lines |
| 12/27/1990 | CA1278355C Method for controlling the amount of moisture associated with a web of moving material |
| 12/26/1990 | CN2068245U Large measuring range direct-reading capacity meter |
| 12/25/1990 | US4980645 Method for diagnosing an insulation deterioration of a power cable |
| 12/20/1990 | DE3919191A1 Two capacitance or resistance difference evaluation circuit - comprises interconnected monostable flip=flops and is used for acceleration sensor in vehicle control system |
| 12/19/1990 | EP0403344A1 Surface impedance measuring apparatus |
| 12/18/1990 | CA1278065C Inductance divider sensor |
| 12/18/1990 | CA1277853C Moisture tester |
| 12/12/1990 | CN2067411U Capacitive induction coordinatograph automatic measuring device |
| 12/11/1990 | CA1277707C Scanning combination thickness and moisture gauge for moving sheet material |
| 12/11/1990 | CA1277706C Automatic short circuit tester control device |
| 12/05/1990 | EP0400853A2 Contactless measurement of the electrical resistance per unit length of filaments |
| 12/04/1990 | US4975968 Timed dielectrometry surveillance method and apparatus |
| 11/28/1990 | EP0399923A1 Method for correcting the phase error caused by measuring a fault current with a symmetric torridale core |
| 11/28/1990 | CN2066584U Automatic monitor for leakage of electricity |
| 11/27/1990 | US4973912 Method for contactless measurement of a resistance arranged in the secondary circuit of a transformer and device for carrying out the method |
| 11/27/1990 | US4972816 Device for determining and/or controlling operating data of automotive vehicles with internal combustion engines |
| 11/22/1990 | EP0398824A1 Numerical insulation tester for powder system |
| 11/22/1990 | EP0397711A1 Fault detection |
| 11/22/1990 | CA2016886A1 Correction procedure of the phase difference introduced by a zero sequence measurement toroid of a leakage current and isolation monitor implementing this procedure |
| 11/21/1990 | CN2066145U Testing device for double-face copper clad panel dielectric constant |
| 11/21/1990 | CN1010508B Dynamical dielectric analyzer |
| 11/20/1990 | US4971663 Electrolysis of cryogenic electrolytes for semiconductors or electronics |
| 11/19/1990 | CA2016979A1 Digital isolation monitor for an electrical power system |
| 11/15/1990 | WO1990013793A1 Circuit and process for measuring a value affecting the capacitance-voltage characteristic of a capacitive component |
| 11/13/1990 | US4969363 Electromagnetic flowmeter capable of simultaneous measurement of flow rate and conductivity of fluid |
| 11/13/1990 | CA1276233C Method and apparatus for locating leaks in a multiple layer geomembrane |
| 11/07/1990 | CN2065323U High-purity water resistivity monitoring device |
| 11/06/1990 | US4968947 Apparatus for the non-destructive measurement of the ohmic resistance of thin layers |
| 11/06/1990 | US4968946 Apparatus and method for determining resistance and capacitance values |
| 10/30/1990 | US4967173 Short airline calibration standards and methods for error-corrected microwave network analysis |
| 10/30/1990 | US4967159 Self-balancing reflectometer |
| 10/24/1990 | EP0312586A4 Spurious resonance control for nmr observe coils |
| 10/24/1990 | EP0281610A4 Capacitor array sensors tactile and proximity sensing and methods of use thereof |
| 10/16/1990 | US4963830 Portable impedance meter for resistance welding equipment |
| 10/11/1990 | DE3911254A1 Method for establishing the complex measuring capability of homodyne network analysers |
| 10/10/1990 | EP0332652A4 Method and apparatus for locating leaks in a multiple layer geomembrane |
| 10/09/1990 | US4962359 Dual directional bridge and balun used as reflectometer test set |
| 10/04/1990 | DE3917706C1 Parasitic capacity measurement method for FETs - has transistors periodically switched by suitable voltage and known capacity parallelly charged and discharged for comparison |
| 10/04/1990 | DE3910610A1 Device for measuring surface resistance |
| 10/03/1990 | EP0389916A1 Apparatus for measuring the dielectric properties of materials |
| 10/03/1990 | CN1045862A Te wave mode resonant chamber with regulation mechanism for off-resonance |
| 10/02/1990 | CA1274877A1 Personnel antistatic test device |
| 09/25/1990 | US4959614 Apparatus for determining microwave characteristics of superconductive materials using a resonant cavity and calibration waveguides |
| 09/25/1990 | CA1274598A1 Apparatus having capacitive sensor and metal detector for detecting objects concealed behind surfaces |
| 09/20/1990 | WO1990010848A1 Liquid level sensor |
| 09/19/1990 | CN2062457U Composite dielectric constant testing sensor of microwave dielectric substrate |
| 09/18/1990 | US4958131 Circuit arrangement for the combined application of an inductive and capacitative device for the non-destructive measurement of the ohmic resistance of thin layers |
| 09/13/1990 | DE3918695C1 Resistance measuring circuit with differential amplifier - has voltage measurement device with input differential amplifier, and constant current source |
| 09/05/1990 | CN2061694U Chmic crystal impedance meter with digital ohmmeter |
| 09/04/1990 | US4954782 Self-checking ohmmeter that checks for contact resistance of its probes |
| 08/29/1990 | CN2061296U Correction apparatus for anti-interference of strong field |
| 08/28/1990 | US4952882 Capacitance sensor assembly |
| 08/28/1990 | US4952881 Electrical test device |
| 08/28/1990 | US4952868 Moisture sensing system for an irrigation system |
| 08/22/1990 | EP0383140A2 Process and appliance for testing windings for short circuits |
| 08/22/1990 | EP0382868A1 Circuit for measuring the resistance of test objects |
| 08/22/1990 | CN2060894U Light guides-microcomputer type instrument for measuring dielectric medium |
| 08/21/1990 | US4950998 Continuous condition sensing system |
| 08/21/1990 | US4950985 Apparatus for measuring electromagnetic values of a coil, in particular for measuring the position of armature of a coil/armature magnetic system |
| 08/15/1990 | CN2060538U Differential resistance type transducer telemetering instrument |
| 08/14/1990 | US4949290 Method and apparatus for defining test sequences for a signal measurement system |
| 08/14/1990 | US4947848 Dielectric-constant change monitoring |