| Patents for G01R 27 - Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom (22,286) |
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| 08/01/1989 | US4853614 Method and apparatus for measuring moisture content of granular material |
| 08/01/1989 | US4853613 Calibration method for apparatus evaluating microwave/millimeter wave circuits |
| 07/27/1989 | DE3801261A1 Device for continually measuring the resistance of a resistance wire fed to a heating conductor winding machine |
| 07/25/1989 | US4851761 Method for measuring insulation resistance of electric line |
| 07/25/1989 | US4850386 Soil Moisture monitor |
| 07/20/1989 | DE3800141A1 Circuit arrangement for generating a sinusoidal electrical signal with variable frequency |
| 07/20/1989 | DE3744524A1 Verfahren und einrichtung zur ueberpruefung einer kapazitaet Method and apparatus for checking a capacity |
| 07/19/1989 | EP0324146A1 Method and apparatus for the determination of the armature resistance of an induction machine |
| 07/18/1989 | US4849701 Method of testing the function of load resistors connected in parallel |
| 07/18/1989 | US4849686 Method of and arrangement for accurately measuring low capacitances |
| 07/13/1989 | WO1989006366A1 Process and device for verifying a capacitance |
| 07/12/1989 | CN1033880A Fault detection |
| 07/11/1989 | US4847598 Water treatment regeneration system incorporating alternating current excitation and paired operational amplifiers with asymmetrical feedback elements |
| 07/11/1989 | US4847551 Apparatus for measuring capacitance of a low value three-terminal capacitor with a resonance technique |
| 07/11/1989 | CA1257332A1 Seawater probe |
| 07/05/1989 | EP0323153A1 Coaxial Electrical Connector |
| 07/05/1989 | CN1033696A Automatic short circuit tester control device |
| 07/04/1989 | US4845691 Group delay time measurement apparatus with automatic aperture value setting function |
| 07/04/1989 | US4845642 Display device for complex transmission reflection characteristics |
| 07/04/1989 | US4845429 Inductance divider sensor |
| 06/28/1989 | EP0321963A1 Impedance measuring apparatus |
| 06/28/1989 | EP0321808A1 Method for measuring the characteristic impedance and propagation constant of a two-port network |
| 06/21/1989 | CN2039854U Decimal precise capacitive loss box |
| 06/21/1989 | CN1033478A Capacitive position sensor |
| 06/20/1989 | US4841458 Analog to digital conversion by measuring the ratio of RC time constants |
| 06/20/1989 | US4841229 Method of and circuit for ohmmeter calibration |
| 06/20/1989 | US4841228 Apparatus for indicating the resistive characteristic of a capacitor |
| 06/15/1989 | WO1989005535A1 Fault detection |
| 06/14/1989 | EP0320469A2 An instrument for the measurement of the "ohms per square" of metalized films |
| 06/14/1989 | CN1033421A Method of and circuit for ohmmeter calibration |
| 06/13/1989 | US4839580 Plated sensor for monitoring corrosion or electroplating |
| 06/13/1989 | US4839578 Method for removing phase instabilities caused by flexure of cables in microwave network analyzer measurements |
| 06/08/1989 | DE3738867A1 Measuring device for determining the leak resistance, earth-leakage resistance and site contact resistance |
| 06/06/1989 | US4837667 Lighting system with lamps arranged between two low-voltage conductors |
| 06/06/1989 | US4837519 Fault detection |
| 06/06/1989 | US4837499 Moisture sensing device |
| 05/30/1989 | US4835513 Method and apparatus for testing an airbag restraint system |
| 05/30/1989 | US4835466 Apparatus and method for detecting spot defects in integrated circuits |
| 05/30/1989 | US4835456 Cryogenic density and mass-flow measurement system |
| 05/24/1989 | EP0317440A1 Device for controling a soldering joint by electronic mesurement of the soldering joint area |
| 05/24/1989 | EP0316958A1 Apparatus and method for measuring frequency response function |
| 05/24/1989 | EP0151575B1 Reactance measurement circuit with enhanced linearity |
| 05/23/1989 | US4833631 System for parameter identification of analog signals |
| 05/23/1989 | US4833396 Lead frame short tester |
| 05/23/1989 | US4833393 Circuit arrangement for capacitance or admittance measurement |
| 05/23/1989 | US4833392 Apparatus and method for measuring electrostatic polarization |
| 05/18/1989 | DE3828856A1 Abstimmverfahren und -einrichtung fuer kapazitaetsmessbruecken Capacitance bridges tuning and setup for |
| 05/18/1989 | DE3828343A1 Anordnung zur messung kleinster kapazitaetsaenderungen Arrangement for the measurement of very small kapazitaetsaenderungen |
| 05/16/1989 | US4831325 Capacitance measuring circuit |
| 05/16/1989 | US4831324 Method and apparatus for analyzing the electrode inpedance |
| 05/11/1989 | DE3735900A1 Method for measuring a resistance value |
| 05/09/1989 | US4829366 Method and apparatus for measuring delay and/or gain difference using two different frequency sources |
| 05/05/1989 | WO1989004001A1 Calibrating method for apparatus evaluating microwave/millimeter wave circuits |
| 05/03/1989 | EP0314088A2 Conductivity measuring device |
| 04/26/1989 | EP0312623A1 Dielectric probe, method and apparatus including its use |
| 04/26/1989 | EP0312586A1 Spurious resonance control for nmr observe coils. |
| 04/25/1989 | US4825158 Method of detecting conductive material contained in glass fiber by detecting changes in amplitude and frequency of an oscillator and detecting apparatus therefor |
| 04/25/1989 | US4825148 Resistance measurement circuit and method |
| 04/25/1989 | US4825147 Capacitance measuring method and apparatus |
| 04/25/1989 | CA1253205A1 Pure water conductivity sensor |
| 04/20/1989 | DE3816957A1 Circuit arrangement with a plurality of shunts for the generation of voltages proportional to currents |
| 04/19/1989 | EP0191046B1 Circuit for continuously controlling the grounding resistance of electric apparatuses |
| 04/13/1989 | DE3832298A1 Method for measuring semiconductor surfaces |
| 04/12/1989 | EP0311376A2 Automatic short circuit tester control device |
| 04/11/1989 | US4820973 Impedance measuring system |
| 04/11/1989 | US4820972 Wall thickness detector |
| 04/06/1989 | WO1989003047A1 Apparatus and methods for measuring permitivity in materials |
| 04/05/1989 | CN2035486U Direct reading measuring device for dielectric loss angle |
| 04/05/1989 | CN1032238A Method and system for measuring electromagnetic parameters of microwave absorbing material |
| 03/29/1989 | EP0309085A2 A detector device |
| 03/29/1989 | CN2035094U Inductance measurement equipment with condensator meter |
| 03/29/1989 | CN2035093U Portable electroscope |
| 03/28/1989 | US4816767 Vector network analyzer with integral processor |
| 03/28/1989 | US4816745 Method and arrangement for measuring the resistance ratio in a resistance half-bridge |
| 03/28/1989 | US4816744 Method and device for measuring inside diameters using a laser interferometer and capacitance measurements |
| 03/23/1989 | WO1989002603A1 Method and apparatus for isolating faults in an antenna system |
| 03/22/1989 | CN2034695U Testing systen of dielectiric character of medium |
| 03/21/1989 | US4814692 Circuit and method for measuring and digitizing the value of a resistance |
| 03/21/1989 | US4814690 Apparatus and methods for measuring permittivity in materials |
| 03/21/1989 | US4814689 Method of measuring a cable delay time |
| 03/21/1989 | CA1251516A1 Capacitive chemical sensor for detecting certain analytes, including hydrocarbons in a liquid medium |
| 03/16/1989 | DE3729031A1 Method for measuring dielectric material properties |
| 03/15/1989 | EP0307261A1 Method and apparatus for the estimation of the electromagnetic characteristics of a dielectric or magnetic material |
| 03/14/1989 | US4813001 AC calibration method and device by determining transfer characteristics |
| 03/14/1989 | US4812752 Detecting/locating open circuit faults in a cable bundle |
| 03/14/1989 | US4812751 Apparatus for monitoring earth faults on the rotor winding of a generator |
| 03/14/1989 | US4812740 Coating detector for low emissivity glass |
| 03/14/1989 | US4812738 Apparatus for analyzing transmission/reflection characteristics |
| 03/09/1989 | EP0303595A4 Linear position sensor. |
| 03/07/1989 | US4811154 Apparatus for rapid recognition of short-circuits |
| 03/07/1989 | US4810972 Automatic short circuit tester control device |
| 03/07/1989 | US4810950 Load resistance measuring technique |
| 03/07/1989 | US4810335 Method for monitoring etching processes |
| 03/01/1989 | EP0305187A2 A digital frequency synthesiser |
| 03/01/1989 | CN1031428A Differential capacitor measuring circuit and multirange measuring instrument |
| 02/28/1989 | US4809129 Liquid level control system for refrigeration apparatus |
| 02/28/1989 | US4809123 Ground fault detector for high-voltage DC power supplies |
| 02/28/1989 | US4808913 Asymmetrical coupling circuit |
| 02/28/1989 | US4808912 Six-port reflectometer test arrangement and method including calibration |
| 02/28/1989 | US4808911 Loop resistance test apparatus |