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| Number | Title | Issue Date |
| 7358748 | Methods and systems for determining a property of an insulating film A method for determining a property of an insulating film is provided. The method may include obtaining a charge density measurement of the film, a surface voltage potential of the film relative to a bulk voltage potential of the substrate, and a rate of voltage dec... | 04/15/2008 |
| 7298160 | Method of measuring gate capacitance by correcting dissipation factor error A gate capacitance of a MOS transistor is determined by (a) measuring the gate capacitance and dissipation factor; (b) obtaining a channel resistance and a tunneling resistance; (c) setting an initial capacitance and an error dissipation factor; (d) calculating a di... | 11/20/2007 |
| 7239152 | Methods for measuring parasitic capacitance and inductance of I/O leads on an electrical component using a network analyzer Apparatus and methods are provided for measuring the potential for mutual coupling in an integrated circuit package of any type or configuration using a network analyzer in conjunction with a coaxial test probe. Simple, low-cost test fixturing and methods of testing... | 07/03/2007 |
| 7212011 | Capacitor deterioration judgment method A method for determining the deterioration of a capacitor that increases the measurement accuracy to have an improved reliability is disclosed. In this method for determining the deterioration of a capacitor, the deterioration of a capacitor including a pair of elec... | 05/01/2007 |
| 7199593 | Apparatus and methods for measuring parasitic capacitance and inductance of I/O leads on an electrical component using a network analyzer Apparatus and methods are provided for measuring the potential for mutual coupling in an integrated circuit package of any type or configuration using a network analyzer in conjunction with a coaxial test probe. Simple, low-cost test fixturing and methods of testing... | 04/03/2007 |
| 7148697 | System and method for measuring electrical characteristics of a capacitor Disclosed are a system and method for measuring electrical characteristics of a capacitor. A measurement assembly can include a constant current assembly for selectively charging and discharging the capacitor and a counter incremented during a measurement period of ... | 12/12/2006 |
| 7132835 | PLL with built-in filter-capacitor leakage-tester with current pump and comparator A filter capacitor within a phase-locked loop (PLL) can be tested using a built-in test circuit. The PLL's charge pump is deactivated while a test-current source is activated to supply a test current to the PLL filter capacitor. When the test current is larger than ... | 11/07/2006 |
| 7012438 | Methods and systems for determining a property of an insulating film A method for determining a property of an insulating film is provided. The method may include obtaining a charge density measurement of the film, a surface voltage potential of the film relative to a bulk voltage potential of the substrate, and a rate of voltage dec... | 03/14/2006 |
| 6906530 | Apparatus and method to detect moisture A method and apparatus for detecting moisture. An oscillatory electrical signal S1 generated by an oscillator is propagated into a body that includes an electrically insulative material. A signal due to S1 emerges from the body as an oscillator... | 06/14/2005 |
| 6675633 | Method for seal testing capacitive sensors 1. Method for testing the tightness of capacitive sensors 2.1. Known methods of seal testing cannot be used because of the extremely small volume of the sensor cavity or on wafer level. Other known methods of seal testing are only possible with high expend... | 01/13/2004 |
| 6674294 | Drive feedthrough nulling system The present invention relates to a system for nulling drive feedthrough error in a sensor having first and second drive electrodes which impart vibratory motion to first and second proof masses in response to first and second opposite phase drive signals,... | 01/06/2004 |
| 6518777 | Method and apparatus for measuring insulation resistance A method and an apparatus for measuring insulation resistance capable of removing the influences of piezoelectric noise which is occurring due to mechanical vibrations applied to an electronic component to measure the insulation resistance of the electron... | 02/11/2003 |
| 6472886 | Method of calculating parasitic capacitance between electrodes of integrated circuits A method of calculating capacitance between conductive patterns of an integrated circuit (IC) by defining a mesh of nodes in a space between at least two electrodes, calculating the electric potential at each node, and then calculating the parasitic capac... | 10/29/2002 |
| 6469516 | Method for inspecting capacitors In a method for judging the conformity or non-conformity of a capacitor from the charging characteristic at the time when a direct-current voltage is applied to the capacitor, a threshold current value I0 of the dielectric polarization componen... | 10/22/2002 |
| 6356086 | Method and apparatus for the in-circuit testing of a capacitor A test apparatus and method of testing a capacitor while it is still in-circuit incorporation a sequence of tests including a DC capacitance value measurement, a measurement of the DC current paths in parallel with the capacitor, a measurement of the equi... | 03/12/2002 |
| 5574442 | Inclination angle sensor First and second fixed electrodes are fixedly provided on a housing which is mounted on a surface whose inclination angle is to be detected. A rotatable electrode is inserted between these fixed electrodes, and this rotatable electrode is mounted on a sha... | 11/12/1996 |
| 5519328 | Compensation for dielectric absorption effect Apparatus is provided for continuously compensating for the dielectric absorption effect in a measuring capacitor in a circuit which employs means for charging the capacitor to develop an output signal thereacross and wherein the absorption effect causes ... | 05/21/1996 |
| 5442297 | Contactless sheet resistance measurement method and apparatus A contactless sheet resistance measurement apparatus and a method for measuring the sheet resistance of a desired layer of a first conductivity type, formed upon a substrate of an opposite conductivity type, is disclosed. The apparatus comprises a junctio... | 08/15/1995 |
| 5384544 | Method and apparatus for calibrating the energy output of a defibrillator A defibfillator has a self healing storage capacitor connected in parallel with a safety resistor, and a microcontroller. Upon receipt of a calibration request, the microcontroller charges the capacitor to a charging voltage greater than a starting voltag... | 01/24/1995 |
| 5302907 | Method of and apparatus for ascertaining a characteristic value of a high-frequency oscillator The resonance frequency and/or damping of a high-frequency oscillator which contains a variable impedance (such as a capacitor in a moisture detector for coffee or tobacco) is ascertained by generating first signals which denote the envelope curves of osc... | 04/12/1994 |
| 5113140 | Microprocessor-controlled high-voltage capacitance bridge A current comparator bridge for measuring the value of an unknown capacitor includes a current comparator having a first comparator winding with an adjustable tap which is connected to one side of a standard capacitor and a second comparator winding conne... | 05/12/1992 |
| 5101160 | Digital isolation monitor for an electrical power system A digital isolation monitor comprises a digital processing signal processor P1 designed to synthesize a sine wave in real time by a table, and to send the digital values of this sine wave to a digital-to-analog converter of an input channel to generate a ... | 03/31/1992 |
| 5068653 | Capacitive displacement measuring device with T-shaped scale coatings A capacitance length and/or angle measuring device has a transducer comprising a stationary part (1) forming a scale and a part (2) displaceable parallel over the surface of the scale, at a short distance therefrom and acting as a sensing unit. The opposi... | 11/26/1991 |
| 4841228 | Apparatus for indicating the resistive characteristic of a capacitor Current passing through a capacitor being measured is combined with programmable portions of oppositely phased current, and means are provided for deriving voltages from said combined current that lie within a given range regardless of the capacitance of ... | 06/20/1989 |
| 4825147 | Capacitance measuring method and apparatus A train of constant current pulses is applied to a capacitor to raise the voltage across the capacitor from a first predetermined level to a second predetermined level. The voltage across the capacitor is measured only during the intervals between the cur... | 04/25/1989 |
| 4795966 | Method and apparatus for measuring the equivalent series resistances of a capacitor An instrument for measuring the equivalent series resistance of a capacitor includes a plurality of constant current generators across which a capacitor under test is adapted to be connected. A selected one of the generators is periodically enabled to sup... | 01/03/1989 |
| 4777430 | Circuit for determining the effective series resistance and Q-factor of capacitors A meter circuit for measuring the effective series resistance (ESR) and Q-Factor of a capacitive device has an operational amplifier with an input to which a source of AC input voltage is applied. A feedback circuit is connected between output and input o... | 10/11/1988 |
| 4772844 | High precision capacitance bridge A capacitance measuring device and method including a ratio transformer, a reference capacitor(s), and multiplying digital to analog converters connected to form a bridge, the converter being adjustable to at least partially balance the bridge. The bridge... | 09/20/1988 |
| 4683417 | Method and apparatus for rapidly testing capacitors and dielectric materials The apparatus comprises a measuring unit (300) which receives a component to be tested (Cx) in series with a reference impedance in a measuring chain, a clock (100) suitable for applying repetitive stimulating pulses to the measuring chain, means for rese... | 07/28/1987 |
| 4560923 | Moisture analyzer A moisture analyzing system including an antenna coupled to a frequency-modulated voltage source and arranged to apply an alternating electric field to a material being tested for moisture content. An LC tank circuit is connected in parallel with the ante... | 12/24/1985 |
| 4433286 | Identification of materials using their complex dielectric response The non-linear conductance and capacitance characteristics of electrically non-homogenous materials over a given frequency range are used to identify and analyze such materials.... | 02/21/1984 |
| 4409543 | Impedance meter An apparatus is disclosed for determining the impedance and dissipation factor of a capacitive and/or inductive device and to reduce measurement error by digital calculation and manipulation. A synchronous rectifying means, a phase shifter and a detecting... | 10/11/1983 |
| 4408157 | Resistance measuring arrangement The invention employs a pair of known resistors which are permanently connected to the input terminals to which the unknown resistor may be connected. A source of d.c. voltage is connected to one input terminal and the voltage drops produced across each k... | 10/04/1983 |
| 4370611 | Identification of materials using their complex dielectric response The non-linear conductance and capacitance characteristics of electrically non-homogenous materials over a given frequency range are used to identify and analyze such materials.... | 01/25/1983 |
| 4352059 | Determination of moisture level in materials A method for determining the moisture content of dielectric materials is described wherein a sample of the material is placed between two electrodes and an electric field is applied. An alternating frequency in the range of radio waves and lower is applie... | 09/28/1982 |
| 4288741 | Electrical measurement of fluid void fraction for fluid having capacitive and resistive conductive components Liquid with solid or gas phases mixed therein is measured as to liquid and non-liquid volume percent by application of an oscillating voltage to the liquid and separation of resultant conductive and capacitive currents to achieve valid and effective measu... | 09/08/1981 |
| 4282480 | Apparatus for humidity detection Apparatus for humidity detection comprises a humidity sensing element, the electrostatic capacitance of which varies in accordance with the ambient humidity, a fixed capacitor, first and second pulse generating circuits respectively responsive to the sens... | 08/04/1981 |
| 4267503 | Method and instrument for testing the operating characteristics of a capacitor Dielectric absorption in a capacitor is detected by making a first measurement of the capacitance of the capacitor, then charging the capacitor to its rated voltage, then discharging the capacitor, and then promptly making a second measurement of the capa... | 05/12/1981 |
| 4216424 | Method and apparatus for testing electrolytic capacitors An Equivalent Series Resistance (ESR) measurement device for testing electrolytic capacitors without removing the test capacitor from the circuit in which it is being used and without first discharging the test capacitor prior to testing. A low voltage AC... | 08/05/1980 |
| 4168466 | Moisture tester A continuous flow moisture tester includes first and second electrodes defining a capacitive-type test cell. The first electrode comprises a generally cylindrical tube of electrically conductive material, and the second electrode comprises a generally pla... | 09/18/1979 |
