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| Number | Title | Issue Date |
| 8044670 | Apparatus and method for determining a resonant frequency of a wind turbine tower An apparatus for determining a resonant frequency of a wind turbine tower is provided. The apparatus includes a processing unit configured to receive an acceleration measurement value, the acceleration measurement value representative of the acceleration of the wind... | 10/25/2011 |
| 7816927 | Method and system for real time identification of voltage stability via identification of weakest lines and buses contributing to power system collapse A method of identifying voltage instability in a power system via identification of a weakest line and bus that contribute to the collapse of the system is provided. The method includes periodically calculating an extended line stability index for the transmission l... | 10/19/2010 |
| 7683633 | Apparatus for extending the bandwidth of vector network analyzer receivers A system for measuring a frequency response of an electrical network includes a signal source, a signal source path, a reflectometer receiver interactively associated with the signal source path by a directional coupler, and one or more additional reflectometer rece... | 03/23/2010 |
| 7405576 | Method and apparatus for measuring high-frequency electrical characteristics of electronic device, and method for calibrating apparatus for measuring high-frequency electrical characteristics Two ends of a transmission line whose electrical characteristics per unit length are known are connected to associated measurement ports of a network analyzer. A short standard is shunt-connected to at least three points in the longitudinal direction of the transmis... | 07/29/2008 |
| 7375534 | Method and apparatus for measuring high-frequency electrical characteristics of electronic device, and method for calibrating apparatus for measuring high-frequency electrical characteristics A plurality of signal conductors and ground conductors are connected to associated measurement ports of a network analyzer. A short standard is connected between each of the signal conductors and the ground conductor at least three points in the longitudinal directi... | 05/20/2008 |
| 7348784 | Error factor acquisition device, method, program, and recording medium A measurement system for circuit parameters of a device under test (DUT) that reduces the number of attachments and detachments of calibration kits. An error factor acquisition device includes a first calibrator connected to ports of a network analyzer that has a fi... | 03/25/2008 |
| 7270017 | Torque measuring device for rotating body A torque measuring device for a rotating body is provided, which includes: a stationary section; a rotary section; a rotary transformer composed of a primary coil disposed at the stationary section, and a secondary coil disposed at the rotary section, wherein an ele... | 09/18/2007 |
| 7271576 | Hand held antenna/network impedance analyzer A handheld portable battery powered digital antenna and/or network analyzer which derives complex impedance values at a given frequency includes an internal direct digital synthesis generator and provides software-defined multiple operating modes and real time graph... | 09/18/2007 |
| 7176673 | Direct current detection circuit A direct current detection circuit has a zero-phase current transformer with source lines inserted therethrough for detecting current differences among them and generates a comparison voltage value based on a divided voltage value obtained between the zero-phase cur... | 02/13/2007 |
| 7176634 | Coaxial type impedance matching device and impedance detecting method for plasma generation A plasma generating method generates plasma in a treating chamber by controlling a high-frequency generating unit to generate a high-frequency signal and by feeding the high-frequency signal to the treating chamber through an impedance matching device. The plasma ge... | 02/13/2007 |
| 7157918 | Method and system for calibrating a measurement device path and for measuring a device under test in the calibrated measurement device path A method and system of calibrating first and second adapters comprises the steps of calibrating coaxial ports of a vector network analyzer to traceable standards and connecting a symmetrical through circuit path between the coaxial ports. The through circuit path co... | 01/02/2007 |
| 7151382 | Apparatus and method for radio frequency power and standing wave ratio measurement A magnitude of radio frequency voltage and current, input into a load from a radio frequency power source, are measured at a single point along a transmission line. Phase difference between voltage and current is also measured. These measurements are used to compute... | 12/19/2006 |
| 7148702 | VNA and method for addressing transmission line effects in VNA measurement data In one embodiment, a vector network analyzer (VNA) comprises a plurality of ports for coupling to a device under test (DUT), at least one reference receiver for measuring signals associated with the DUT, and logic for processing measurement data from the at least on... | 12/12/2006 |
| 7107162 | Determining an operational limit of a power transmission line In a method, computer program and system for determining an operational limit of a power transmission line, time-stamped current phasor information and voltage phasor information for a first end and a second end of the line are determined, an ohmic resistance of the... | 09/12/2006 |
| 7095598 | Fault detection apparatus and method There is provided an apparatus for producing a trip signal to activate a circuit breaker in an alternating current power line, said apparatus comprising: a sensing circuit operable to sense values representing: a phase difference between current and voltage in said ... | 08/22/2006 |
| 7088110 | System and method for determining S-parameters of a connected structure One disclosed embodiment may include a method that includes providing a first set S-parameters for a path of a first substrate having a first port and a second port and providing a second set of S-parameters for a path of a second substrate having a first port and a... | 08/08/2006 |
| 7088111 | Enhanced isolation level between sampling channels in a vector network analyzer A system and method for providing improved isolation between sampling channels in a vector network analyzer and sampling circuit. A vector network analyzer sampling channel includes a non-linear transmission line, an isolation device, a band-pass filter, and a sampl... | 08/08/2006 |
| 7088088 | Triggered narrow-band method for making pulsed-RF networking measurements A method of measuring a device under test (“DUT”) includes applying a pulsed-RF input signal to the DUT and coupling an output of the DUT to a receiver having an output bandwidth selected to measure a center tone in an RF pulse response spectrum from the output ... | 08/08/2006 |
| 7088109 | Method and apparatus for measuring a digital device A method and apparatus for characterizing a non-linear device stimulates the device with a repetitive digital signal and uses relative phase measurements made with a vector network analyzer to measure the device response to the digital stimulus. ... | 08/08/2006 |
| 7085657 | Signal processing unit for a pressure switch or the like A signal processing unit for a pressure switch or the like, comprising a sensor element, such as a strain gauge bridge, to supply an analog electrical signal that corresponds to a pressure; a signal processing unit which is connected downstream of the sensor element... | 08/01/2006 |
| 7068046 | Calibration techniques for simplified high-frequency multiport differential measurements Embodiments of the present invention are directed towards systems, methods, and computer readable media for performing multiport vector network analysis. Embodiments of the present invention relate to a multiport network analysis that is derived from a family of two... | 06/27/2006 |
| 7061221 | Reduced complexity transmission line and waveguide fault tester A four-port junction is substituted for a six-port junction in a frequency domain reflectometer, which reduces the parts count and therefore cost and size of the reflectometer while improving reliability. The frequency domain reflectometer can alternatively be used ... | 06/13/2006 |
| 7057390 | Linear beam raster magnet driver based on H-bridge technique An improved raster magnet driver for a linear particle beam is based on an H-bridge technique. Four branches of power HEXFETs form a two-by-two switch. Switching the HEXFETs in a predetermined order and at the right frequency produces a triangular current waveform. ... | 06/06/2006 |
| 7042229 | System and method for on line monitoring of insulation condition for DC machines Insulation condition monitoring systems and methods for a rotating DC electric machine, the method comprising: measuring a first set of values for an instantaneous differential current and an instantaneous voltage during operation of the rotating DC electric machine... | 05/09/2006 |
| 7034548 | Balanced device characterization including test system calibration A test system and method characterize a balanced device under test (DUT) with a vector network analyzer (VNA) measurement system using a differential or balanced stimulus signal and further calibrate the VNA using conventional calibration standards. An effect of err... | 04/25/2006 |
| 7030627 | Wideband complex radio frequency impedance measurement Impedance of an unknown load is determined by applying a reference signal from a signal generator through a multi-position switch to the unknown load, a first known calibration impedance, and second known impedance, which can be an open circuit, while measuring the ... | 04/18/2006 |
| 7030628 | Method and device for evaluating charge potential In a charge potential evaluation device, the measured value of a potential difference Vc in a charged plate monitor (CPM) is converted into a potential difference Vh between the conductive pattern and load beam in a head gimbal assembly (HGA), ... | 04/18/2006 |
| 7019535 | Method and system for calibrating a measurement device path and for measuring a device under test in the calibrated measurement device path A method and system of calibrating first and second adapters comprises the steps of calibrating coaxial ports of a vector network analyzer to traceable standards and connecting a symmetrical through circuit path between the coaxial ports. The through circuit path co... | 03/28/2006 |
| 7005918 | Current-to-voltage converting apparatus and impedance measuring apparatus A current-to-voltage converting apparatus connected to an element or a circuit having a first terminal connected to a signal source and comprising a feedback amplifier, which is connected to a second terminal of the element or the circuit and keeps the second termin... | 02/28/2006 |
| 6970002 | Tube measurement and calibration system A tube measurement and calibration system including a network analyzer for measuring tube radio frequency phase, a calibration adapter for calibrating tube radio frequency power and phase, an amplifier for amplifying input radio frequency power into the tube, and a ... | 11/29/2005 |
| 6956380 | Narrow-band amplifier and impedance-measuring apparatus An impedance measuring apparatus comprising an automatic balanced bridge has four numerically controlled oscillators that supply sine-wave signals and cosine-wave signals to the quadrature detector and vector modulator of the narrow-band amplifier inside the automat... | 10/18/2005 |
| 6906431 | Wind power system for Delivering constant apparent power A wind power facility having a plurality of wind power installations, the wind power installations connected to a current voltage network into which the electrical current generated is fed or delivered that, independent of the currently prevailing amount of wind and... | 06/14/2005 |
| 6863564 | Coaxial radio frequency adapter and method A coaxial radio frequency adapter and method are disclosed. An adapter has a tapered signal pin and a tapered ground sleeve to maintain a consistent impedance and minimize reflections while connecting two elements having different dimensions. A method employs an ada... | 03/08/2005 |
| 6816825 | Simulation vector generation from HDL descriptions for observability-enhanced statement coverage A method of automatically generating vector sequences for an observability based coverage metric supports design validation. A design validation method for Register Transfer Level (RTL) circuits includes the generation of a tag list. Each tag in the tag list models ... | 11/09/2004 |
| 6760633 | Method and apparatus for predicting stability of a closed loop apparatus A method for predicting stability of a closed loop apparatus is disclosed. The closed loop apparatus has an open loop impedance and at least one inherent internal gain. The method comprises the steps of: (a) identifying an impedance scaling factor associated with th... | 07/06/2004 |
| 6512383 | System for measuring the alternating current equivalent series resistance of a conductor A system and method for measuring the alternating current series resistance of a conductor when transporting large currents on the order of several thousand amperes. The system comprises a current sensor, a current/voltage converter, a voltage divider, a ... | 01/28/2003 |
| 6483501 | Load current compensated type voltage sampling circuit A load current compensated voltage sampling circuit is characterized by a sampling voltage that is compensated by utilizing different load current values of the detected sample as parameters for transforming into the intended display target value.... | 11/19/2002 |
| 6396287 | Process for measuring output harmonic relative to output fundamental with enhanced accuracy A method is provided for eliminating the source harmonic component from VNA measurements of the output of a device under test (DUT). A standard vector measurement, GHx, is first measured from the DUT using the VNA. The value GHx is composed of two element... | 05/28/2002 |
| 6392422 | Monitoring insulation and fault current in an A/C current network to provide load shutoff whenever differential current exceeds a certain response value A method and device for monitoring insulation and fault current in an electrical alternating current network. The differential current formed by vectorial addition is detected between at least two network conductors. Load-cut occurs when the differential ... | 05/21/2002 |
| 6385547 | Automatic monitoring of high voltage signals A pair of terminals across a voltage to be monitored includes, in series, a resistor for developing a low voltage proportional to the high voltage to be monitored, a resistor to develop a voltage indicative of an over-current condition, and a resistance c... | 05/07/2002 |
