| Patents for G01R 27 - Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom (22,286) |
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| 09/10/1991 | US5047726 Method and apparatus for implementing four-frequency measuring process for coupled-dual resonator crystals using both resonator ports |
| 09/10/1991 | US5047725 Verification and correction method for an error model for a measurement network |
| 09/10/1991 | CA1288813C Process for rapidly determining the swelling-clay content of earth formations |
| 09/04/1991 | EP0444816A2 Circuit element measuring method and apparatus |
| 09/04/1991 | CN2084200U Multipurpose wide frequency band phase shift trace power supply |
| 09/03/1991 | US5045798 Planar interdigitated dielectric sensor |
| 09/03/1991 | US5045797 Continuous condition sensing system determining liquid level by admittance measurement |
| 09/03/1991 | US5045786 Circuit for measuring a variable inductance connected in series with a fixed inductance |
| 09/03/1991 | CA1288526C Test circuit for measuring specific contact resistivity of self-aligned contacts in integrated circuits |
| 09/03/1991 | CA1288477C Apparatus and methods for measuring permittivity in materials |
| 08/28/1991 | EP0443835A2 Circuit element measuring apparatus and method |
| 08/28/1991 | EP0442898A1 Method and apparatus for measurement of capacitance and for capacitive measurement of displacement. |
| 08/28/1991 | CA2037112A1 Measuring device used to verify the contact established between two electric conductors |
| 08/28/1991 | CA2036263A1 Circuit element measuring apparatus and method |
| 08/22/1991 | CA2036127A1 Circuit element measuring apparatus and method |
| 08/21/1991 | EP0442727A2 Paper thickness detecting apparatus |
| 08/21/1991 | EP0442693A1 An electromagnetic conductivity meter and a conductivity measuring method |
| 08/21/1991 | EP0442670A1 Four frequency measuring process for coupled-dual resonator crystals |
| 08/21/1991 | EP0441857A1 Detection of non-metallic materials |
| 08/17/1991 | CA2034438A1 Third case associated with the four frequency measuring process for coupled-dual resonator crystals |
| 08/14/1991 | EP0441649A2 Inductance and resistance measuring circuit |
| 08/14/1991 | EP0441587A2 Multi-channel electrostatic sensor apparatus |
| 08/14/1991 | CN2082867U Radiofrequency passing type power/standing-wave ratio meter |
| 08/14/1991 | CN1013520B Te wave mode resonant chamber with detune adjusting mechanism |
| 08/13/1991 | US5039949 RF absorber test system |
| 08/13/1991 | CA1287675C2 Sensor and metal detector with a display for quantitatively displaying signals resulting from concealed objects |
| 08/08/1991 | WO1991011708A1 Electrodeless conductivity sensor with inflatable surface |
| 08/08/1991 | CA2069752A1 Electrodeless conductivity sensor with inflatable surface |
| 08/08/1991 | CA2035909A1 Measurement coupling for low capacitances |
| 08/07/1991 | CN1053685A Inductor/capacitor quality factor and loss measurer |
| 07/25/1991 | WO1991010899A1 Process and device for determining amplitude and phase values according to a reflectometric measurement process |
| 07/24/1991 | EP0438103A2 Process and appliance for measuring physical sizes |
| 07/24/1991 | EP0437532A1 Composition monitor and monitoring process using impedance measurements. |
| 07/17/1991 | EP0436777A2 Method and apparatus for analog testing of thin film transistor arrays |
| 07/16/1991 | CA1286363C Technique for determining the values of circuit elements in a threeterminal equivalent circuit |
| 07/11/1991 | WO1991010147A1 Device for automatically ascertaining capacitor breakdown voltage |
| 07/11/1991 | DE4032714A1 Automatic measurement range selector for digital multi-instrument - contains parallel A=D converter and logic controlling output of measurement voltage damping element |
| 07/10/1991 | CN2080677U Resistance measurer for 150 a a.micro-ohm micro-ohm magnitude of loop |
| 07/10/1991 | CN1052951A Automatic measuring range selector of digital multimeter |
| 07/09/1991 | US5031068 Liquid level control system for refrigeration apparatus |
| 07/09/1991 | US5030919 Zero impedance switch |
| 07/09/1991 | US5030918 Portable gauge for measuring thickness variations of thin plastic film |
| 07/04/1991 | DE4002155A1 Capacitive measurement head for thickness of thermoplastic foil - has bar-shaped inner electrode enclosed by flattened ring outer electrode, both with low coefficient of thermal expansion |
| 07/02/1991 | US5028876 Precision capacitive transducer circuits and methods |
| 07/02/1991 | US5028874 Ratiometric measurement circuit with improved noise rejection |
| 07/02/1991 | US5028131 Lightwave test set for an RF network analyzer system |
| 07/02/1991 | US5027499 Diposition of wall; dissolving; thermoconductivity recording |
| 06/28/1991 | CA2006753A1 Element, module, device and process for detecting no x gas |
| 06/27/1991 | DE3942159A1 Anordnung zur verarbeitung von sensorsignalen An arrangement for processing sensor signals |
| 06/21/1991 | WO1991009278A1 Arrangement for processing sensor signals |
| 06/20/1991 | DE3941975A1 Monitoring circuitry for isolation resistances - has single pole measurement arrangement contg. bridge circuit for unearthed AC networks including supplied circuits |
| 06/19/1991 | CN2079301U Digital megohmmeter |
| 06/19/1991 | CN2079300U Meter-resistivity continuous measuring device |
| 06/19/1991 | CN1052378A Measuring method for tg (delta) of bridge body plus anti-interference source |
| 06/18/1991 | US5025221 Method for measurement of attenuation and distortion by a test object |
| 06/18/1991 | US5025219 Apparatus and method continuous measurement of the electrical conductivity of liquid media in a dynamic cell |
| 06/18/1991 | US5025212 Circuit for measuring the dynamic characteristics of a package for high-speed integrated circuits and a method for measuring said dynamic characteristics |
| 06/16/1991 | WO1991009316A1 Biosensor electrode excitation circuit |
| 06/12/1991 | EP0431365A2 Apparatus for measuring the conductivity of a fluid |
| 06/12/1991 | CN2078885U Digital measuring instrument of insulator resistance and bleeder current |
| 06/12/1991 | CN1012874B Unbalanced complete cut-off network |
| 06/11/1991 | US5023556 Sensor circuit response to different fluid conductivities and having time delay feature |
| 06/08/1991 | WO1991009276A1 Arrangement for processing sensor signals |
| 06/06/1991 | DE4038640A1 Combustion processes monitoring system - uses relationship between soot particle density and ion concn. in exhaust gases to control air-fuel ratio |
| 06/05/1991 | EP0430823A1 Permanent monitoring system for the electric conduction of a network |
| 06/05/1991 | EP0430475A2 Calibration verification and correction method |
| 06/05/1991 | CN2078447U Micro-computer testing device for characteristic resistance of integrated circuit |
| 06/05/1991 | CN1012758B High frequency inducdtance and capacitance measuring instrument |
| 06/04/1991 | US5021740 Method and apparatus for measuring the distance between a body and a capacitance probe |
| 06/04/1991 | US5021625 Pre-resistance-welding resistance check |
| 06/04/1991 | CA1284673C Calibration method for apparatus evaluating microwave/millimeter wave circuits |
| 05/28/1991 | US5019782 Method for determining the qualities and/or frequencies of electrical tuned circuits |
| 05/28/1991 | US5019781 Source level control for impedance meter |
| 05/22/1991 | EP0428502A1 Device for detecting objects behind a surface |
| 05/21/1991 | CA1284357C Sonde for measuring the electric formation resistivity in earth strata |
| 05/15/1991 | EP0427611A1 Chip capacitors testing and sorting apparatus |
| 05/15/1991 | CN1051426A Ratimetric measurement circuit with improved noise rejection |
| 05/14/1991 | US5015951 Apparatus and methods for measuring permeability and conductivity in materials using multiple wavenumber magnetic interrogations |
| 05/08/1991 | EP0426297A2 Ratiometric measurement circuit with improved noise rejection |
| 05/08/1991 | EP0426012A2 Conductivity meter |
| 05/07/1991 | US5014043 Current sensing |
| 05/07/1991 | US5014012 D.C. biasing apparatus |
| 05/07/1991 | US5014011 Capacitance measuring apparatus with means for nulling the resistive component |
| 05/02/1991 | WO1991006000A1 Three-toroid electrodeless conductivity cell |
| 04/23/1991 | CA1283449C Ice detector |
| 04/23/1991 | CA1283445C Method of and circuit for ohmmeter calibration |
| 04/16/1991 | US5008627 Conductivity detector |
| 04/16/1991 | CA1283199C Method of nondestructive quality control of carbon articles |
| 04/16/1991 | CA1283168C Capacitance measuring circuit |
| 04/10/1991 | EP0420895A1 Measurement of moisture content and electrical conductivity |
| 04/10/1991 | CN1050615A Vernier voltage to digital converter |
| 04/09/1991 | US5006809 Apparatus for measuring the electrical resistance of a test specimen |
| 04/03/1991 | EP0420767A1 Vector analyser for millimeter and/or submillimeter network |
| 04/03/1991 | EP0420082A2 Digitally synchronized sweep signal source |
| 04/03/1991 | CN2074459U Micro-ohm gauge for rapid-measuring inductive loading low-resistant |
| 04/02/1991 | US5005008 Method and apparatus for providing thermodynamic protection of a driver circuit used in an in-circuit tester |
| 03/30/1991 | WO1991005267A1 Vernier voltage-to-digital converter |
| 03/27/1991 | CN2074018U Inductive load micro-ohmmeter with arc extinguishing equipment |
| 03/26/1991 | CA1282116C Method and apparatus for well casing inspection |
| 03/20/1991 | EP0418117A1 Apparatus for characterising dielectric properties of samples of materials, having an even or uneven surface, and application to the non-destructive control of the dielectric homogeneity of said samples |